From 1022301d080b5229831e7551423c5c18a0ae35d4 Mon Sep 17 00:00:00 2001
From: Lee Messenger <lee@aptitude.co.uk>
Date: Sat, 18 Apr 2026 13:11:27 +0100
Subject: [PATCH 1/2] Avalonia start

---
 .claude/settings.local.json                   |  11 +
 Directory.Packages.props                      |   8 +
 .../{AboutWindow.xaml => AboutWindow.axaml}   |  39 +--
 ImageResize.ContextMenu/AboutWindow.axaml.cs  |  19 ++
 ImageResize.ContextMenu/AboutWindow.xaml.cs   |  33 --
 ImageResize.ContextMenu/App.axaml             |   8 +
 ImageResize.ContextMenu/App.axaml.cs          |  80 +++++
 ImageResize.ContextMenu/App.xaml              |   8 -
 ImageResize.ContextMenu/App.xaml.cs           | 303 ------------------
 ImageResize.ContextMenu/Assets/icon.ico       | Bin 165086 -> 105542 bytes
 .../ImageResize.ContextMenu.csproj            |  11 +-
 ImageResize.ContextMenu/Installer.iss         |   5 +-
 .../{MainWindow.xaml => MainWindow.axaml}     | 162 +++-------
 ...MainWindow.xaml.cs => MainWindow.axaml.cs} | 133 +++++---
 ImageResize.ContextMenu/Program.cs            |  16 +
 ImageResize.ContextMenu/README.md             |  10 +
 ImageResize.ContextMenu/app.manifest          |  15 +
 17 files changed, 327 insertions(+), 534 deletions(-)
 create mode 100644 .claude/settings.local.json
 rename ImageResize.ContextMenu/{AboutWindow.xaml => AboutWindow.axaml} (55%)
 create mode 100644 ImageResize.ContextMenu/AboutWindow.axaml.cs
 delete mode 100644 ImageResize.ContextMenu/AboutWindow.xaml.cs
 create mode 100644 ImageResize.ContextMenu/App.axaml
 create mode 100644 ImageResize.ContextMenu/App.axaml.cs
 delete mode 100644 ImageResize.ContextMenu/App.xaml
 delete mode 100644 ImageResize.ContextMenu/App.xaml.cs
 rename ImageResize.ContextMenu/{MainWindow.xaml => MainWindow.axaml} (56%)
 rename ImageResize.ContextMenu/{MainWindow.xaml.cs => MainWindow.axaml.cs} (86%)
 create mode 100644 ImageResize.ContextMenu/Program.cs
 create mode 100644 ImageResize.ContextMenu/app.manifest

diff --git a/.claude/settings.local.json b/.claude/settings.local.json
new file mode 100644
index 0000000..c8bcd5d
--- /dev/null
+++ b/.claude/settings.local.json
@@ -0,0 +1,11 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(*)",
+      "Bash(mkdir -p \"C:/Projects/ImageResize/.claude/tmp-icon-work\")",
+      "Bash(magick \"C:/Projects/ImageResize/ImageResize.ContextMenu/Assets/icon.ico[8]\" \"C:/Projects/ImageResize/.claude/tmp-icon-work/existing-256.png\")",
+      "Bash(rm -rf \"C:/Projects/ImageResize/.claude/tmp-icon-work\")",
+      "Bash(magick identify *)"
+    ]
+  }
+}
diff --git a/Directory.Packages.props b/Directory.Packages.props
index 5eb2d97..929bcd7 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -23,6 +23,14 @@
         <PackageVersion Include="System.IO.Hashing" Version="10.0.6" />
     </ItemGroup>
 
+    <ItemGroup Label="Avalonia (ContextMenu desktop UI)">
+        <PackageVersion Include="Avalonia" Version="11.2.5" />
+        <PackageVersion Include="Avalonia.Desktop" Version="11.2.5" />
+        <PackageVersion Include="Avalonia.Themes.Fluent" Version="11.2.5" />
+        <PackageVersion Include="Avalonia.Fonts.Inter" Version="11.2.5" />
+        <PackageVersion Include="Avalonia.Diagnostics" Version="11.2.5" />
+    </ItemGroup>
+
     <ItemGroup Label="SourceLink">
         <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
     </ItemGroup>
diff --git a/ImageResize.ContextMenu/AboutWindow.xaml b/ImageResize.ContextMenu/AboutWindow.axaml
similarity index 55%
rename from ImageResize.ContextMenu/AboutWindow.xaml
rename to ImageResize.ContextMenu/AboutWindow.axaml
index b004e13..6128bc9 100644
--- a/ImageResize.ContextMenu/AboutWindow.xaml
+++ b/ImageResize.ContextMenu/AboutWindow.axaml
@@ -1,22 +1,13 @@
-<Window x:Class="ImageResize.ContextMenu.AboutWindow"
-        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+<Window xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        x:Class="ImageResize.ContextMenu.AboutWindow"
         Title="About Resize Images"
         Width="460"
         Height="340"
-        ResizeMode="NoResize"
+        CanResize="False"
         ShowInTaskbar="False"
-        WindowStartupLocation="CenterOwner"
-        Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"
-        Foreground="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}">
-    <Grid Margin="24">
-        <Grid.RowDefinitions>
-            <RowDefinition Height="Auto" />
-            <RowDefinition Height="Auto" />
-            <RowDefinition Height="Auto" />
-            <RowDefinition Height="*" />
-            <RowDefinition Height="Auto" />
-        </Grid.RowDefinitions>
+        WindowStartupLocation="CenterOwner">
+    <Grid Margin="24" RowDefinitions="Auto,Auto,Auto,*,Auto">
 
         <TextBlock Grid.Row="0"
                    Text="Resize Images"
@@ -39,21 +30,23 @@
             <TextBlock TextWrapping="Wrap"
                        FontSize="12"
                        Opacity="0.75"
-                       Text="Minimal, cross-platform image-resize middleware for ASP.NET Core, plus a Windows desktop companion app. Distributed under the MIT License." />
-            <TextBlock Margin="0,12,0,0" FontSize="12">
-                <Hyperlink x:Name="GitHubLink"
-                           NavigateUri="https://github.com/YodasMyDad/ImageResize"
-                           RequestNavigate="Hyperlink_RequestNavigate">
-                    github.com/YodasMyDad/ImageResize
-                </Hyperlink>
-            </TextBlock>
+                       Text="Minimal, cross-platform image-resize middleware for ASP.NET Core, plus a desktop companion app. Distributed under the MIT License." />
+            <HyperlinkButton x:Name="GitHubLink"
+                             Margin="0,8,0,0"
+                             Padding="0"
+                             FontSize="12"
+                             HorizontalAlignment="Left"
+                             Content="github.com/YodasMyDad/ImageResize"
+                             NavigateUri="https://github.com/YodasMyDad/ImageResize"/>
         </StackPanel>
 
         <StackPanel Grid.Row="4" Orientation="Horizontal" HorizontalAlignment="Right">
             <Button x:Name="CloseButton"
                     Content="Close"
                     Width="96"
-                    Height="30"
+                    Height="32"
+                    HorizontalContentAlignment="Center"
+                    VerticalContentAlignment="Center"
                     IsDefault="True"
                     IsCancel="True"
                     Click="CloseButton_Click" />
diff --git a/ImageResize.ContextMenu/AboutWindow.axaml.cs b/ImageResize.ContextMenu/AboutWindow.axaml.cs
new file mode 100644
index 0000000..5867447
--- /dev/null
+++ b/ImageResize.ContextMenu/AboutWindow.axaml.cs
@@ -0,0 +1,19 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+
+namespace ImageResize.ContextMenu;
+
+public partial class AboutWindow : Window
+{
+    public AboutWindow()
+    {
+        InitializeComponent();
+
+        AppVersionText.Text = $"Version {VersionInfo.AppVersion}";
+        CoreVersionText.Text = $"ImageResize.Core: {VersionInfo.CoreVersion}";
+        SkiaVersionText.Text = $"SkiaSharp: {VersionInfo.SkiaSharpVersion}";
+        RuntimeVersionText.Text = $"Runtime: {VersionInfo.Runtime}";
+    }
+
+    private void CloseButton_Click(object? sender, RoutedEventArgs e) => Close();
+}
diff --git a/ImageResize.ContextMenu/AboutWindow.xaml.cs b/ImageResize.ContextMenu/AboutWindow.xaml.cs
deleted file mode 100644
index c7a2be2..0000000
--- a/ImageResize.ContextMenu/AboutWindow.xaml.cs
+++ /dev/null
@@ -1,33 +0,0 @@
-using System.Diagnostics;
-using System.Windows;
-using System.Windows.Navigation;
-
-namespace ImageResize.ContextMenu;
-
-public partial class AboutWindow : Window
-{
-    public AboutWindow()
-    {
-        InitializeComponent();
-
-        AppVersionText.Text = $"Version {VersionInfo.AppVersion}";
-        CoreVersionText.Text = $"ImageResize.Core: {VersionInfo.CoreVersion}";
-        SkiaVersionText.Text = $"SkiaSharp: {VersionInfo.SkiaSharpVersion}";
-        RuntimeVersionText.Text = $"Runtime: {VersionInfo.Runtime}";
-    }
-
-    private void CloseButton_Click(object sender, RoutedEventArgs e) => Close();
-
-    private void Hyperlink_RequestNavigate(object sender, RequestNavigateEventArgs e)
-    {
-        try
-        {
-            Process.Start(new ProcessStartInfo(e.Uri.AbsoluteUri) { UseShellExecute = true });
-        }
-        catch (System.ComponentModel.Win32Exception)
-        {
-            // User has no default browser; silently ignore.
-        }
-        e.Handled = true;
-    }
-}
diff --git a/ImageResize.ContextMenu/App.axaml b/ImageResize.ContextMenu/App.axaml
new file mode 100644
index 0000000..5a1ec2f
--- /dev/null
+++ b/ImageResize.ContextMenu/App.axaml
@@ -0,0 +1,8 @@
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="ImageResize.ContextMenu.App"
+             RequestedThemeVariant="Default">
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>
diff --git a/ImageResize.ContextMenu/App.axaml.cs b/ImageResize.ContextMenu/App.axaml.cs
new file mode 100644
index 0000000..f9176e1
--- /dev/null
+++ b/ImageResize.ContextMenu/App.axaml.cs
@@ -0,0 +1,80 @@
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using ImageResize.Core.Codecs;
+using ImageResize.Core.Configuration;
+using ImageResize.Core.Interfaces;
+using ImageResize.Core.Services;
+using ImageResize.ContextMenu.Services;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+
+namespace ImageResize.ContextMenu;
+
+public partial class App : Application
+{
+    // TODO (post-POC): restore single-instance mutex + named-pipe IPC for multi-select
+    // context-menu invocations. Stripped for the POC so the Avalonia port can be validated
+    // end-to-end without the platform-IPC distraction. Previous implementation in
+    // git history on master (pre-avalonia-port).
+
+    public static IServiceProvider Services { get; private set; } = null!;
+
+    public override void Initialize() => AvaloniaXamlLoader.Load(this);
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        ConfigureServices();
+
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            desktop.MainWindow = Services.GetRequiredService<MainWindow>();
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+
+    private static void ConfigureServices()
+    {
+        var services = new ServiceCollection();
+
+        services.AddLogging(builder =>
+        {
+            builder.AddDebug();
+            builder.SetMinimumLevel(LogLevel.Information);
+        });
+
+        services.Configure<ImageResizeOptions>(options =>
+        {
+            options.DefaultQuality = 99;
+            options.PngCompressionLevel = 6;
+            options.AllowUpscale = false;
+            options.Backend = ImageBackend.SkiaSharp;
+            options.WebRoot = string.Empty;
+        });
+
+        services.AddSingleton<IImageCodec, SkiaCodec>();
+        services.AddSingleton<IImageResizerService>(sp =>
+        {
+            var options = sp.GetRequiredService<IOptions<ImageResizeOptions>>();
+            var codec = sp.GetRequiredService<IImageCodec>();
+            var logger = sp.GetRequiredService<ILogger<ImageResizerService>>();
+            var cache = new NullImageCache();
+            return new ImageResizerService(options, cache, codec, logger);
+        });
+
+        services.AddSingleton<ImageProcessor>();
+        services.AddTransient<MainWindow>();
+
+        Services = services.BuildServiceProvider();
+    }
+}
+
+internal sealed class NullImageCache : IImageCache
+{
+    public Task<bool> ExistsAsync(string path, CancellationToken ct = default) => Task.FromResult(false);
+    public string GetCachedFilePath(string relativePath, ImageResize.Models.ResizeOptions resizeOptions, string sourceSignature) => string.Empty;
+    public Task WriteAtomicallyAsync(string path, Stream data, CancellationToken ct = default) => Task.CompletedTask;
+    public Task<Stream> OpenReadAsync(string path, CancellationToken ct = default) => Task.FromResult(Stream.Null);
+}
diff --git a/ImageResize.ContextMenu/App.xaml b/ImageResize.ContextMenu/App.xaml
deleted file mode 100644
index 33c3ab3..0000000
--- a/ImageResize.ContextMenu/App.xaml
+++ /dev/null
@@ -1,8 +0,0 @@
-<Application x:Class="ImageResize.ContextMenu.App"
-             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-    <Application.Resources>
-         
-    </Application.Resources>
-</Application>
-
diff --git a/ImageResize.ContextMenu/App.xaml.cs b/ImageResize.ContextMenu/App.xaml.cs
deleted file mode 100644
index c961cdd..0000000
--- a/ImageResize.ContextMenu/App.xaml.cs
+++ /dev/null
@@ -1,303 +0,0 @@
-using System.IO;
-using System.IO.Pipes;
-using System.Security.Principal;
-using System.Text;
-using System.Windows;
-using System.Windows.Threading;
-using ImageResize.Core.Codecs;
-using ImageResize.Core.Configuration;
-using ImageResize.Core.Interfaces;
-using ImageResize.Core.Services;
-using ImageResize.ContextMenu.Services;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Logging;
-using Microsoft.Extensions.Options;
-
-namespace ImageResize.ContextMenu;
-
-public partial class App : Application
-{
-    private const string MutexName = @"Global\ImageResize.ContextMenu.SingleInstance";
-    private const int ClientConnectTimeoutMs = 2000;
-    private const int ClientRetryAttempts = 5;
-    private const int ClientRetryDelayMs = 200;
-
-    public static IServiceProvider Services { get; private set; } = null!;
-
-    private Mutex? _singleInstanceMutex;
-    private bool _ownsMutex;
-    private CancellationTokenSource? _ipcCts;
-
-    public App()
-    {
-        ConfigureServices();
-
-        DispatcherUnhandledException += OnDispatcherUnhandledException;
-        AppDomain.CurrentDomain.UnhandledException += OnAppDomainUnhandledException;
-        TaskScheduler.UnobservedTaskException += OnUnobservedTaskException;
-    }
-
-    protected override void OnStartup(StartupEventArgs e)
-    {
-        base.OnStartup(e);
-
-        _singleInstanceMutex = new Mutex(initiallyOwned: true, name: MutexName, createdNew: out var createdNew);
-        _ownsMutex = createdNew;
-
-        if (!createdNew)
-        {
-            ForwardArgsToRunningInstance(Environment.GetCommandLineArgs().Skip(1).ToArray());
-            Shutdown();
-            return;
-        }
-
-        StartIpcServer();
-
-        var mainWindow = Services.GetRequiredService<MainWindow>();
-        var startupArgs = Environment.GetCommandLineArgs().Skip(1).ToArray();
-        LogStartupArgs("Primary instance", startupArgs);
-        mainWindow.Show();
-    }
-
-    protected override void OnExit(ExitEventArgs e)
-    {
-        base.OnExit(e);
-        try { _ipcCts?.Cancel(); } catch (ObjectDisposedException) { }
-        _ipcCts?.Dispose();
-
-        if (_ownsMutex && _singleInstanceMutex is not null)
-        {
-            try { _singleInstanceMutex.ReleaseMutex(); }
-            catch (ApplicationException) { /* not held on this thread */ }
-        }
-        _singleInstanceMutex?.Dispose();
-    }
-
-    private static string GetPipeName()
-    {
-        var sid = WindowsIdentity.GetCurrent()?.User?.Value ?? "Default";
-        return $"ImageResize.ContextMenu.Pipe.{sid}";
-    }
-
-    private static string GetLogPath()
-    {
-        var baseDir = Path.Combine(
-            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
-            "ImageResize", "ContextMenu");
-        Directory.CreateDirectory(baseDir);
-        return Path.Combine(baseDir, "log.txt");
-    }
-
-    private static void SafeLog(string message)
-    {
-        try
-        {
-            File.AppendAllText(
-                GetLogPath(),
-                $"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}] {message}{Environment.NewLine}");
-        }
-        catch (IOException) { }
-        catch (UnauthorizedAccessException) { }
-    }
-
-    private static void SafeLog(Exception ex, string context)
-        => SafeLog($"{context}: {ex.GetType().Name}: {ex.Message}");
-
-    private static void LogStartupArgs(string label, string[] args)
-    {
-        string cwd;
-        try { cwd = Environment.CurrentDirectory; }
-        catch (Exception ex) { cwd = $"<error: {ex.GetType().Name}>"; }
-
-        SafeLog($"{label}. argc={args.Length} cwd='{cwd}'");
-        for (var i = 0; i < args.Length; i++)
-        {
-            var a = args[i];
-            bool exists;
-            try { exists = !string.IsNullOrWhiteSpace(a) && File.Exists(a); }
-            catch (Exception) { exists = false; }
-            var ext = string.Empty;
-            try { ext = Path.GetExtension(a ?? string.Empty); } catch (ArgumentException) { }
-            SafeLog($"  arg[{i}] len={(a?.Length ?? 0)} exists={exists} ext='{ext}' value='{a}'");
-        }
-    }
-
-    private static void ForwardArgsToRunningInstance(string[] args)
-    {
-        LogStartupArgs("Secondary instance forwarding", args);
-        if (args.Length == 0)
-            return;
-
-        var pipeName = GetPipeName();
-
-        for (var attempt = 0; attempt < ClientRetryAttempts; attempt++)
-        {
-            try
-            {
-                using var client = new NamedPipeClientStream(
-                    ".", pipeName, PipeDirection.Out, PipeOptions.Asynchronous);
-                client.Connect(ClientConnectTimeoutMs);
-
-                using var writer = new StreamWriter(client, new UTF8Encoding(false)) { AutoFlush = true };
-                foreach (var a in args)
-                {
-                    if (File.Exists(a))
-                    {
-                        SafeLog($" -> send '{a}'");
-                        writer.WriteLine(a);
-                    }
-                }
-                writer.WriteLine();
-                client.Flush();
-                return;
-            }
-            catch (TimeoutException ex)
-            {
-                SafeLog(ex, $"IPC forward attempt {attempt + 1}: pipe busy");
-            }
-            catch (IOException ex)
-            {
-                SafeLog(ex, $"IPC forward attempt {attempt + 1}");
-            }
-            Thread.Sleep(ClientRetryDelayMs);
-        }
-
-        SafeLog("IPC forward failed after retries; giving up.");
-    }
-
-    private void ConfigureServices()
-    {
-        var services = new ServiceCollection();
-
-        services.AddLogging(builder =>
-        {
-            builder.AddDebug();
-            builder.SetMinimumLevel(LogLevel.Information);
-        });
-
-        services.Configure<ImageResizeOptions>(options =>
-        {
-            options.DefaultQuality = 99;
-            options.PngCompressionLevel = 6;
-            options.AllowUpscale = false;
-            options.Backend = ImageBackend.SkiaSharp;
-            options.WebRoot = string.Empty;
-        });
-
-        services.AddSingleton<IImageCodec, SkiaCodec>();
-        services.AddSingleton<IImageResizerService>(sp =>
-        {
-            var options = sp.GetRequiredService<IOptions<ImageResizeOptions>>();
-            var codec = sp.GetRequiredService<IImageCodec>();
-            var logger = sp.GetRequiredService<ILogger<ImageResizerService>>();
-            var cache = new NullImageCache();
-            return new ImageResizerService(options, cache, codec, logger);
-        });
-
-        services.AddSingleton<ImageProcessor>();
-        services.AddTransient<MainWindow>();
-
-        Services = services.BuildServiceProvider();
-    }
-
-    private void StartIpcServer()
-    {
-        _ipcCts = new CancellationTokenSource();
-        var ct = _ipcCts.Token;
-        var pipeName = GetPipeName();
-
-        _ = Task.Run(async () =>
-        {
-            while (!ct.IsCancellationRequested)
-            {
-                try
-                {
-                    await using var server = new NamedPipeServerStream(
-                        pipeName,
-                        PipeDirection.In,
-                        NamedPipeServerStream.MaxAllowedServerInstances,
-                        PipeTransmissionMode.Byte,
-                        PipeOptions.Asynchronous);
-
-                    await server.WaitForConnectionAsync(ct).ConfigureAwait(false);
-
-                    using var reader = new StreamReader(server, Encoding.UTF8, detectEncodingFromByteOrderMarks: true);
-                    var received = new List<string>();
-                    string? line;
-                    while ((line = await reader.ReadLineAsync(ct).ConfigureAwait(false)) != null)
-                    {
-                        if (string.IsNullOrWhiteSpace(line))
-                            break;
-                        if (File.Exists(line))
-                            received.Add(line);
-                    }
-
-                    if (received.Count > 0)
-                    {
-                        await Dispatcher.InvokeAsync(() =>
-                        {
-                            if (Current?.MainWindow is MainWindow mw)
-                            {
-                                SafeLog($"IPC received {received.Count} file(s). First='{received.FirstOrDefault()}'");
-                                mw.AddFiles(received);
-                                if (mw.WindowState == WindowState.Minimized)
-                                    mw.WindowState = WindowState.Normal;
-                                mw.Activate();
-                                mw.Focus();
-                            }
-                        });
-                    }
-                }
-                catch (OperationCanceledException)
-                {
-                    break;
-                }
-                catch (IOException ex)
-                {
-                    SafeLog(ex, "IPC server I/O error");
-                }
-                catch (ObjectDisposedException)
-                {
-                    break;
-                }
-            }
-        }, ct);
-    }
-
-    private void OnDispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
-    {
-        SafeLog(e.Exception, "Dispatcher unhandled");
-        try
-        {
-            MessageBox.Show(
-                MainWindow,
-                $"An unexpected error occurred:\n\n{e.Exception.Message}\n\nSee the log in\n%LocalAppData%\\ImageResize\\ContextMenu\\log.txt",
-                "Resize Images",
-                MessageBoxButton.OK,
-                MessageBoxImage.Error);
-        }
-        catch (InvalidOperationException) { /* app shutting down */ }
-        e.Handled = true;
-    }
-
-    private static void OnAppDomainUnhandledException(object sender, UnhandledExceptionEventArgs e)
-    {
-        if (e.ExceptionObject is Exception ex)
-            SafeLog(ex, $"AppDomain unhandled (terminating={e.IsTerminating})");
-    }
-
-    private static void OnUnobservedTaskException(object? sender, UnobservedTaskExceptionEventArgs e)
-    {
-        SafeLog(e.Exception, "Unobserved task exception");
-        e.SetObserved();
-    }
-}
-
-// Minimal null cache implementation for desktop usage
-internal sealed class NullImageCache : IImageCache
-{
-    public Task<bool> ExistsAsync(string path, CancellationToken ct = default) => Task.FromResult(false);
-    public string GetCachedFilePath(string relativePath, ImageResize.Models.ResizeOptions resizeOptions, string sourceSignature) => string.Empty;
-    public Task WriteAtomicallyAsync(string path, Stream data, CancellationToken ct = default) => Task.CompletedTask;
-    public Task<Stream> OpenReadAsync(string path, CancellationToken ct = default) => Task.FromResult(Stream.Null);
-}
diff --git a/ImageResize.ContextMenu/Assets/icon.ico b/ImageResize.ContextMenu/Assets/icon.ico
index d7696cb6e0974eea36c7fdd6b92adc2b1acf2d3d..f50a5e41b2f7e21d48dc4611ba6ed0da5fd7ab55 100644
GIT binary patch
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diff --git a/ImageResize.ContextMenu/ImageResize.ContextMenu.csproj b/ImageResize.ContextMenu/ImageResize.ContextMenu.csproj
index 7935c91..c91d8bf 100644
--- a/ImageResize.ContextMenu/ImageResize.ContextMenu.csproj
+++ b/ImageResize.ContextMenu/ImageResize.ContextMenu.csproj
@@ -1,12 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <OutputType>WinExe</OutputType>
-        <TargetFramework>net10.0-windows</TargetFramework>
+        <TargetFramework>net10.0</TargetFramework>
         <RootNamespace>ImageResize.ContextMenu</RootNamespace>
-        <UseWPF>true</UseWPF>
         <ApplicationIcon>Assets\icon.ico</ApplicationIcon>
         <AssemblyName>ImageResize.ContextMenu</AssemblyName>
         <Product>ImageResize Context Menu</Product>
+        <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+        <ApplicationManifest>app.manifest</ApplicationManifest>
+        <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
         <NoWarn>$(NoWarn);CS1591;CA1848;CA1001;CA1822</NoWarn>
     </PropertyGroup>
 
@@ -17,6 +19,11 @@
     </ItemGroup>
 
     <ItemGroup>
+        <PackageReference Include="Avalonia" />
+        <PackageReference Include="Avalonia.Desktop" />
+        <PackageReference Include="Avalonia.Themes.Fluent" />
+        <PackageReference Include="Avalonia.Fonts.Inter" />
+        <PackageReference Include="Avalonia.Diagnostics" Condition="'$(Configuration)' == 'Debug'" />
         <PackageReference Include="Microsoft.Extensions.DependencyInjection" />
         <PackageReference Include="Microsoft.Extensions.Logging" />
         <PackageReference Include="Microsoft.Extensions.Logging.Debug" />
diff --git a/ImageResize.ContextMenu/Installer.iss b/ImageResize.ContextMenu/Installer.iss
index 1a3be85..a616540 100644
--- a/ImageResize.ContextMenu/Installer.iss
+++ b/ImageResize.ContextMenu/Installer.iss
@@ -11,7 +11,8 @@
 #ifndef MyAppVersion
   #define MyAppVersion GetFileVersion("..\publish\" + Platform + "\ImageResize.ContextMenu.exe")
 #endif
-#define MyAppPublisher "ImageResize"
+; Must match the Authenticode certificate subject once signing is wired up (see plan).
+#define MyAppPublisher "Lee Messenger"
 #define MyAppURL "https://github.com/YodasMyDad/ImageResize"
 #define MyAppExeName "ImageResize.ContextMenu.exe"
 
@@ -31,7 +32,7 @@ LicenseFile=..\LICENSE.txt
 PrivilegesRequired=admin
 OutputDir=..\publish\installer
 OutputBaseFilename=ImageResize-ContextMenu-Setup-{#MyAppVersion}-{#Platform}
-; SetupIconFile=Assets\icon.ico
+SetupIconFile=Assets\icon.ico
 Compression=lzma
 SolidCompression=yes
 WizardStyle=modern
diff --git a/ImageResize.ContextMenu/MainWindow.xaml b/ImageResize.ContextMenu/MainWindow.axaml
similarity index 56%
rename from ImageResize.ContextMenu/MainWindow.xaml
rename to ImageResize.ContextMenu/MainWindow.axaml
index 4921c5f..a654e18 100644
--- a/ImageResize.ContextMenu/MainWindow.xaml
+++ b/ImageResize.ContextMenu/MainWindow.axaml
@@ -1,74 +1,18 @@
-<Window x:Class="ImageResize.ContextMenu.MainWindow"
-        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+<Window xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        x:Class="ImageResize.ContextMenu.MainWindow"
         Title="Resize Images"
         Width="560"
         Height="680"
-        ResizeMode="NoResize"
+        CanResize="False"
         WindowStartupLocation="CenterScreen"
-        AllowDrop="True"
-        Drop="Window_Drop"
-        DragOver="Window_DragOver"
-        Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"
-        Foreground="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}">
+        DragDrop.AllowDrop="True">
 
-    <!-- ApplicationCommands.Help defaults to F1 -->
-    <Window.CommandBindings>
-        <CommandBinding Command="ApplicationCommands.Help" Executed="Help_Executed" />
-    </Window.CommandBindings>
-
-    <Window.Resources>
-        <Style x:Key="PrimaryButton" TargetType="Button">
-            <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
-            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
-            <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
-            <Setter Property="BorderThickness" Value="0"/>
-            <Setter Property="Padding" Value="12,6"/>
-            <Setter Property="Cursor" Value="Hand"/>
-            <Style.Triggers>
-                <Trigger Property="IsMouseOver" Value="True">
-                    <Setter Property="Opacity" Value="0.9"/>
-                </Trigger>
-                <Trigger Property="IsPressed" Value="True">
-                    <Setter Property="Opacity" Value="0.75"/>
-                </Trigger>
-                <Trigger Property="IsEnabled" Value="False">
-                    <Setter Property="Opacity" Value="0.5"/>
-                    <Setter Property="Cursor" Value="Arrow"/>
-                </Trigger>
-            </Style.Triggers>
-        </Style>
-
-        <Style x:Key="SubtleIconButton" TargetType="Button">
-            <Setter Property="Background" Value="Transparent"/>
-            <Setter Property="BorderThickness" Value="0"/>
-            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
-            <Setter Property="Cursor" Value="Hand"/>
-            <Setter Property="FontSize" Value="14"/>
-            <Setter Property="Padding" Value="6"/>
-        </Style>
-    </Window.Resources>
-
-    <Grid Margin="24,16,24,20">
-        <Grid.RowDefinitions>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="Auto"/>
-            <RowDefinition Height="*"/>
-            <RowDefinition Height="Auto"/>
-        </Grid.RowDefinitions>
+    <Grid Margin="24,16,24,20"
+          RowDefinitions="Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,*,Auto">
 
         <!-- Header row: file info + About button -->
-        <Grid Grid.Row="0" Margin="0,0,0,16">
-            <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="*"/>
-                <ColumnDefinition Width="Auto"/>
-            </Grid.ColumnDefinitions>
+        <Grid Grid.Row="0" Margin="0,0,0,16" ColumnDefinitions="*,Auto">
             <StackPanel Grid.Column="0">
                 <TextBlock x:Name="FileCountText"
                            FontSize="16"
@@ -82,38 +26,40 @@
             </StackPanel>
             <Button Grid.Column="1"
                     x:Name="AboutButton"
-                    Style="{StaticResource SubtleIconButton}"
                     Content="?"
-                    Width="28"
-                    Height="28"
-                    ToolTip="About (F1)"
+                    Width="32"
+                    Height="32"
+                    Padding="0"
+                    FontSize="14"
+                    FontWeight="SemiBold"
+                    CornerRadius="16"
+                    HorizontalContentAlignment="Center"
+                    VerticalContentAlignment="Center"
+                    ToolTip.Tip="About (F1)"
                     AutomationProperties.Name="About"
                     Click="AboutButton_Click"/>
         </Grid>
 
-        <!-- Drop hint -->
-        <Border Grid.Row="1"
-                x:Name="DropHintBorder"
-                Margin="0,0,0,16"
-                Padding="10,6"
-                CornerRadius="4"
-                BorderThickness="1"
-                BorderBrush="{DynamicResource {x:Static SystemColors.ActiveBorderBrushKey}}"
-                Background="{DynamicResource {x:Static SystemColors.ControlBrushKey}}">
-            <TextBlock Text="Tip: drag additional images onto this window to queue them."
-                       FontSize="11"
-                       Opacity="0.75"
-                       TextWrapping="Wrap"/>
-        </Border>
+        <!-- Drop zone -->
+        <Grid Grid.Row="1" x:Name="DropZone" Margin="0,0,0,16" Height="56">
+            <Rectangle x:Name="DropZoneBorder"
+                       Stroke="#66888888"
+                       StrokeThickness="1.5"
+                       StrokeDashArray="4,3"
+                       RadiusX="6"
+                       RadiusY="6"/>
+            <TextBlock Text="Drop additional images here"
+                       HorizontalAlignment="Center"
+                       VerticalAlignment="Center"
+                       FontSize="12"
+                       FontWeight="SemiBold"
+                       Foreground="{DynamicResource TextFillColorSecondaryBrush}"/>
+        </Grid>
 
         <!-- Percentage Slider -->
         <StackPanel Grid.Row="2" Margin="0,0,0,20">
             <TextBlock x:Name="PercentageLabel" Text="Size Percentage" FontWeight="SemiBold" Margin="0,0,0,8"/>
-            <Grid>
-                <Grid.ColumnDefinitions>
-                    <ColumnDefinition Width="*"/>
-                    <ColumnDefinition Width="Auto"/>
-                </Grid.ColumnDefinitions>
+            <Grid ColumnDefinitions="*,Auto">
                 <Slider x:Name="PercentageSlider"
                         Minimum="10"
                         Maximum="200"
@@ -137,20 +83,14 @@
         <!-- Dimensions -->
         <StackPanel x:Name="DimensionsPanel" Grid.Row="3" Margin="0,0,0,20">
             <TextBlock Text="Target Dimensions" FontWeight="SemiBold" Margin="0,0,0,10"/>
-            <Grid>
-                <Grid.ColumnDefinitions>
-                    <ColumnDefinition Width="*"/>
-                    <ColumnDefinition Width="Auto"/>
-                    <ColumnDefinition Width="*"/>
-                </Grid.ColumnDefinitions>
-
+            <Grid ColumnDefinitions="*,Auto,*">
                 <StackPanel Grid.Column="0">
                     <TextBlock Text="Width (px)" Margin="0,0,0,4"/>
                     <TextBox x:Name="WidthBox"
                              TabIndex="2"
                              AutomationProperties.Name="Target width in pixels"
                              TextChanged="DimensionBox_TextChanged"
-                             PreviewTextInput="NumberValidationTextBox"/>
+                             TextInput="NumberValidationTextBox"/>
                 </StackPanel>
 
                 <TextBlock Grid.Column="1"
@@ -166,7 +106,7 @@
                              TabIndex="3"
                              AutomationProperties.Name="Target height in pixels"
                              TextChanged="DimensionBox_TextChanged"
-                             PreviewTextInput="NumberValidationTextBox"/>
+                             TextInput="NumberValidationTextBox"/>
                 </StackPanel>
             </Grid>
         </StackPanel>
@@ -174,11 +114,7 @@
         <!-- Quality Slider -->
         <StackPanel Grid.Row="4" Margin="0,0,0,20">
             <TextBlock Text="Quality" FontWeight="SemiBold" Margin="0,0,0,8"/>
-            <Grid>
-                <Grid.ColumnDefinitions>
-                    <ColumnDefinition Width="*"/>
-                    <ColumnDefinition Width="Auto"/>
-                </Grid.ColumnDefinitions>
+            <Grid ColumnDefinitions="*,Auto">
                 <Slider x:Name="QualitySlider"
                         Minimum="10"
                         Maximum="100"
@@ -213,12 +149,8 @@
         </StackPanel>
 
         <!-- Progress -->
-        <StackPanel Grid.Row="6" Margin="0,0,0,16" x:Name="ProgressPanel" Visibility="Collapsed">
-            <Grid Margin="0,0,0,6">
-                <Grid.ColumnDefinitions>
-                    <ColumnDefinition Width="*"/>
-                    <ColumnDefinition Width="Auto"/>
-                </Grid.ColumnDefinitions>
+        <StackPanel Grid.Row="6" Margin="0,0,0,16" x:Name="ProgressPanel" IsVisible="False">
+            <Grid Margin="0,0,0,6" ColumnDefinitions="*,Auto">
                 <TextBlock Grid.Column="0"
                            x:Name="ProgressText"
                            Text="Processing..."
@@ -232,18 +164,20 @@
             <ProgressBar x:Name="ProgressBar" Height="8" Minimum="0" Maximum="100"/>
         </StackPanel>
 
-        <!-- Result summary -->
+        <!-- Result summary. Hardcoded colours: theme resources for "caution" are
+             unreliable in Avalonia 11.2.5 Fluent (see drop-zone rendering bug discovered
+             earlier). Amber at low opacity reads well in both Light and Dark. -->
         <Border Grid.Row="7"
                 x:Name="ErrorBorder"
-                Background="{DynamicResource {x:Static SystemColors.InfoBrushKey}}"
-                BorderBrush="{DynamicResource {x:Static SystemColors.ActiveBorderBrushKey}}"
+                Background="#22F59E0B"
+                BorderBrush="#66F59E0B"
                 BorderThickness="1"
                 Padding="12"
                 Margin="0,0,0,16"
-                Visibility="Collapsed"
+                IsVisible="False"
                 CornerRadius="4">
             <StackPanel>
-                <TextBlock x:Name="ErrorHeading" Text="Error" FontWeight="Bold"/>
+                <TextBlock x:Name="ErrorHeading" Text="Error" FontWeight="SemiBold"/>
                 <TextBlock x:Name="ErrorText" TextWrapping="Wrap" Margin="0,4,0,0"/>
             </StackPanel>
         </Border>
@@ -257,6 +191,8 @@
                     Margin="0,0,12,0"
                     TabIndex="7"
                     IsCancel="True"
+                    HorizontalContentAlignment="Center"
+                    VerticalContentAlignment="Center"
                     Click="CancelButton_Click"/>
             <Button x:Name="ResizeButton"
                     Content="Resize"
@@ -264,7 +200,9 @@
                     Height="34"
                     TabIndex="6"
                     IsDefault="True"
-                    Style="{StaticResource PrimaryButton}"
+                    Classes="accent"
+                    HorizontalContentAlignment="Center"
+                    VerticalContentAlignment="Center"
                     Click="ResizeButton_Click"/>
         </StackPanel>
     </Grid>
diff --git a/ImageResize.ContextMenu/MainWindow.xaml.cs b/ImageResize.ContextMenu/MainWindow.axaml.cs
similarity index 86%
rename from ImageResize.ContextMenu/MainWindow.xaml.cs
rename to ImageResize.ContextMenu/MainWindow.axaml.cs
index d0b3748..0337edf 100644
--- a/ImageResize.ContextMenu/MainWindow.xaml.cs
+++ b/ImageResize.ContextMenu/MainWindow.axaml.cs
@@ -1,10 +1,16 @@
 using System.Collections;
+using System.Globalization;
 using System.IO;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 using System.Text;
 using System.Text.RegularExpressions;
-using System.Windows;
-using System.Windows.Input;
+using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+using Avalonia.Platform.Storage;
+using Avalonia.Threading;
 using ImageResize.ContextMenu.Models;
 using ImageResize.ContextMenu.Services;
 using Microsoft.CSharp.RuntimeBinder;
@@ -36,7 +42,20 @@ public MainWindow(ImageProcessor imageProcessor)
 
         Title = $"Resize Images — v{VersionInfo.AppVersion}";
 
-        Loaded += async (_, _) => await InitializeAsync().ConfigureAwait(false);
+        AddHandler(DragDrop.DragOverEvent, Window_DragOver);
+        AddHandler(DragDrop.DropEvent, Window_Drop);
+        KeyDown += OnKeyDown;
+
+        Opened += async (_, _) => await InitializeAsync().ConfigureAwait(false);
+    }
+
+    private void OnKeyDown(object? sender, KeyEventArgs e)
+    {
+        if (e.Key == Key.F1)
+        {
+            ShowAbout();
+            e.Handled = true;
+        }
     }
 
     private async Task InitializeAsync()
@@ -55,15 +74,15 @@ private async Task InitializeAsync()
             // No command-line args means Windows didn't pass the selection (typical for Desktop
             // shell-verb invocations). Try the Desktop listview first — a stale selection in a
             // background Explorer window would otherwise hijack the result.
-            if (initial.Count == 0)
+            if (initial.Count == 0 && OperatingSystem.IsWindows())
                 initial = GetSelectedDesktopImagePaths();
 
-            if (initial.Count == 0)
+            if (initial.Count == 0 && OperatingSystem.IsWindows())
                 initial = GetSelectedExplorerImagePaths();
 
             if (initial.Count == 0)
             {
-                Dispatcher.Invoke(() =>
+                await Dispatcher.UIThread.InvokeAsync(() =>
                 {
                     ShowInfo("No valid image files were provided. Please select images and use the context menu, or drag images onto this window.");
                     ResizeButton.IsEnabled = false;
@@ -76,19 +95,19 @@ private async Task InitializeAsync()
 
             var imageInfo = await _imageProcessor.GetImageInfoAsync(_imagePaths[0]).ConfigureAwait(false);
 
-            Dispatcher.Invoke(() =>
+            await Dispatcher.UIThread.InvokeAsync(() =>
             {
                 _originalWidth = imageInfo.Width;
                 _originalHeight = imageInfo.Height;
                 RefreshHeader();
-                WidthBox.Text = _originalWidth.ToString(System.Globalization.CultureInfo.InvariantCulture);
-                HeightBox.Text = _originalHeight.ToString(System.Globalization.CultureInfo.InvariantCulture);
+                WidthBox.Text = _originalWidth.ToString(CultureInfo.InvariantCulture);
+                HeightBox.Text = _originalHeight.ToString(CultureInfo.InvariantCulture);
                 ConfigureUiForMode();
             });
         }
         catch (Exception ex)
         {
-            Dispatcher.Invoke(() =>
+            await Dispatcher.UIThread.InvokeAsync(() =>
             {
                 ShowError($"Failed to load image: {ex.Message}");
                 ResizeButton.IsEnabled = false;
@@ -104,13 +123,13 @@ private void RefreshHeader()
             OriginalDimensionsText.Text = _originalWidth > 0 && _originalHeight > 0
                 ? $"Original: {_originalWidth} × {_originalHeight} px"
                 : string.Empty;
-            OriginalDimensionsText.Visibility = Visibility.Visible;
+            OriginalDimensionsText.IsVisible = true;
         }
         else
         {
             FileCountText.Text = $"Resizing {_imagePaths.Count} images";
             OriginalDimensionsText.Text = string.Empty;
-            OriginalDimensionsText.Visibility = Visibility.Collapsed;
+            OriginalDimensionsText.IsVisible = false;
         }
     }
 
@@ -171,6 +190,7 @@ private static IEnumerable<string> EnumerateDesktopRoots()
         }
     }
 
+    [SupportedOSPlatform("windows")]
     private static List<string> GetSelectedExplorerImagePaths()
     {
         var results = new List<string>();
@@ -225,6 +245,7 @@ private static List<string> GetSelectedExplorerImagePaths()
     // Reads the Windows Desktop's current selection by talking to the Progman/WorkerW SysListView32
     // directly. Needed because Shell.Application.Windows() does not expose the Desktop, and Windows
     // does not pass %* command-line args to shell verbs invoked from the Desktop.
+    [SupportedOSPlatform("windows")]
     private static List<string> GetSelectedDesktopImagePaths()
     {
         var results = new List<string>();
@@ -308,7 +329,6 @@ private static string ResolveDesktopItem(string name, IReadOnlyList<string> root
             var direct = Path.Combine(root, name);
             if (File.Exists(direct)) return direct;
 
-            // "Hide extensions of known file types" is on — try known image extensions.
             if (string.IsNullOrEmpty(Path.GetExtension(name)))
             {
                 foreach (var ext in ImageExtensions)
@@ -321,9 +341,9 @@ private static string ResolveDesktopItem(string name, IReadOnlyList<string> root
         return string.Empty;
     }
 
+    [SupportedOSPlatform("windows")]
     private static IntPtr FindDesktopListView()
     {
-        // Classic path: Progman > SHELLDLL_DefView > SysListView32
         var hProgman = FindWindow("Progman", null);
         if (hProgman != IntPtr.Zero)
         {
@@ -335,8 +355,6 @@ private static IntPtr FindDesktopListView()
             }
         }
 
-        // Wallpaper slideshow / some Win10+ configs reparent SHELLDLL_DefView into a WorkerW
-        // sibling of Progman. Enumerate top-level WorkerW windows and probe each.
         IntPtr found = IntPtr.Zero;
         var classBuf = new char[32];
         EnumWindows((hWnd, _) =>
@@ -443,20 +461,19 @@ private void ConfigureUiForMode()
     {
         if (_isMultipleImages)
         {
-            DimensionsPanel.Visibility = Visibility.Collapsed;
+            DimensionsPanel.IsVisible = false;
             PercentageLabel.Text = "Size Percentage (applies to all images)";
             OriginalDimensionsText.Text = string.Empty;
-            OriginalDimensionsText.Visibility = Visibility.Collapsed;
+            OriginalDimensionsText.IsVisible = false;
         }
         else
         {
-            DimensionsPanel.Visibility = Visibility.Visible;
+            DimensionsPanel.IsVisible = true;
             PercentageLabel.Text = "Size Percentage";
-            OriginalDimensionsText.Visibility = Visibility.Visible;
+            OriginalDimensionsText.IsVisible = true;
         }
     }
 
-    // Called by App when a secondary instance forwards more files
     public void AddFiles(IEnumerable<string> files)
     {
         if (_resizeInProgress) return;
@@ -481,15 +498,15 @@ public void AddFiles(IEnumerable<string> files)
 
         if (!_isMultipleImages && _originalWidth > 0 && _originalHeight > 0)
         {
-            WidthBox.Text = _originalWidth.ToString(System.Globalization.CultureInfo.InvariantCulture);
-            HeightBox.Text = _originalHeight.ToString(System.Globalization.CultureInfo.InvariantCulture);
+            WidthBox.Text = _originalWidth.ToString(CultureInfo.InvariantCulture);
+            HeightBox.Text = _originalHeight.ToString(CultureInfo.InvariantCulture);
         }
 
-        ErrorBorder.Visibility = Visibility.Collapsed;
+        ErrorBorder.IsVisible = false;
         ResizeButton.IsEnabled = true;
     }
 
-    private void PercentageSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
+    private void PercentageSlider_ValueChanged(object? sender, RangeBaseValueChangedEventArgs e)
     {
         if (_isUpdatingFromTextBox || _originalWidth == 0 || _originalHeight == 0)
             return;
@@ -501,13 +518,13 @@ private void PercentageSlider_ValueChanged(object sender, RoutedPropertyChangedE
         if (!_isMultipleImages)
         {
             var scale = percentage / 100.0;
-            WidthBox.Text = ((int)Math.Round(_originalWidth * scale)).ToString(System.Globalization.CultureInfo.InvariantCulture);
-            HeightBox.Text = ((int)Math.Round(_originalHeight * scale)).ToString(System.Globalization.CultureInfo.InvariantCulture);
+            WidthBox.Text = ((int)Math.Round(_originalWidth * scale)).ToString(CultureInfo.InvariantCulture);
+            HeightBox.Text = ((int)Math.Round(_originalHeight * scale)).ToString(CultureInfo.InvariantCulture);
         }
         _isUpdatingFromSlider = false;
     }
 
-    private void DimensionBox_TextChanged(object sender, System.Windows.Controls.TextChangedEventArgs e)
+    private void DimensionBox_TextChanged(object? sender, TextChangedEventArgs e)
     {
         if (_isUpdatingFromSlider || _originalWidth == 0 || _originalHeight == 0 || _isMultipleImages)
             return;
@@ -522,13 +539,13 @@ private void DimensionBox_TextChanged(object sender, System.Windows.Controls.Tex
         _isUpdatingFromTextBox = false;
     }
 
-    private void QualitySlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
+    private void QualitySlider_ValueChanged(object? sender, RangeBaseValueChangedEventArgs e)
     {
         if (QualityText != null)
-            QualityText.Text = ((int)e.NewValue).ToString(System.Globalization.CultureInfo.InvariantCulture);
+            QualityText.Text = ((int)e.NewValue).ToString(CultureInfo.InvariantCulture);
     }
 
-    private async void ResizeButton_Click(object sender, RoutedEventArgs e)
+    private async void ResizeButton_Click(object? sender, RoutedEventArgs e)
     {
         if (_imagePaths.Count == 0)
         {
@@ -544,8 +561,8 @@ private async void ResizeButton_Click(object sender, RoutedEventArgs e)
         {
             ResizeButton.IsEnabled = false;
             CancelButton.Content = "Stop";
-            ProgressPanel.Visibility = Visibility.Visible;
-            ErrorBorder.Visibility = Visibility.Collapsed;
+            ProgressPanel.IsVisible = true;
+            ErrorBorder.IsVisible = false;
             ProgressBar.Value = 0;
             ProgressText.Text = "Starting…";
             ProgressEtaText.Text = string.Empty;
@@ -617,7 +634,7 @@ private void ResetPostRunUi()
     {
         ResizeButton.IsEnabled = true;
         CancelButton.Content = "Cancel";
-        ProgressPanel.Visibility = Visibility.Collapsed;
+        ProgressPanel.IsVisible = false;
     }
 
     private static string FormatDuration(TimeSpan ts)
@@ -639,7 +656,7 @@ private static string FormatBatchFailure(BatchResizeException ex)
         return $"{header}{Environment.NewLine}{failures}";
     }
 
-    private void CancelButton_Click(object sender, RoutedEventArgs e)
+    private void CancelButton_Click(object? sender, RoutedEventArgs e)
     {
         if (_resizeInProgress)
         {
@@ -653,57 +670,71 @@ private void CancelButton_Click(object sender, RoutedEventArgs e)
         }
     }
 
-    private void AboutButton_Click(object sender, RoutedEventArgs e) => ShowAbout();
-
-    private void Help_Executed(object sender, System.Windows.Input.ExecutedRoutedEventArgs e) => ShowAbout();
+    private void AboutButton_Click(object? sender, RoutedEventArgs e) => ShowAbout();
 
     public void ShowAbout()
     {
-        var dlg = new AboutWindow { Owner = this };
-        dlg.ShowDialog();
+        var dlg = new AboutWindow();
+        _ = dlg.ShowDialog(this);
     }
 
-    private void Window_DragOver(object sender, DragEventArgs e)
+    private void Window_DragOver(object? sender, DragEventArgs e)
     {
-        e.Effects = HasImageFiles(e.Data) ? DragDropEffects.Copy : DragDropEffects.None;
+        e.DragEffects = HasImageFiles(e.Data) ? DragDropEffects.Copy : DragDropEffects.None;
         e.Handled = true;
     }
 
-    private void Window_Drop(object sender, DragEventArgs e)
+    private void Window_Drop(object? sender, DragEventArgs e)
     {
         if (_resizeInProgress) return;
-        if (e.Data.GetData(DataFormats.FileDrop) is not string[] files) return;
+
+        var files = ExtractImageFilePaths(e.Data);
+        if (files.Count == 0) return;
 
         AddFiles(files);
         e.Handled = true;
     }
 
     private static bool HasImageFiles(IDataObject data)
+        => ExtractImageFilePaths(data).Count > 0;
+
+    private static List<string> ExtractImageFilePaths(IDataObject data)
     {
-        if (data.GetData(DataFormats.FileDrop) is not string[] files)
-            return false;
-        return files.Any(IsImageFile);
+        var result = new List<string>();
+        var files = data.GetFiles();
+        if (files == null) return result;
+
+        foreach (var item in files)
+        {
+            var path = item.TryGetLocalPath();
+            if (!string.IsNullOrEmpty(path) && IsImageFile(path))
+                result.Add(path);
+        }
+        return result;
     }
 
     private void ShowInfo(string message)
     {
         ErrorHeading.Text = "Info";
         ErrorText.Text = message;
-        ErrorBorder.Visibility = Visibility.Visible;
+        ErrorBorder.IsVisible = true;
     }
 
     private void ShowError(string message)
     {
         ErrorHeading.Text = "Error";
         ErrorText.Text = message;
-        ErrorBorder.Visibility = Visibility.Visible;
+        ErrorBorder.IsVisible = true;
     }
 
     private static bool IsImageFile(string path)
         => ImageExtensions.Contains(Path.GetExtension(path));
 
-    private void NumberValidationTextBox(object sender, TextCompositionEventArgs e)
-        => e.Handled = NumberOnly.IsMatch(e.Text);
+    private void NumberValidationTextBox(object? sender, TextInputEventArgs e)
+    {
+        if (!string.IsNullOrEmpty(e.Text) && NumberOnly.IsMatch(e.Text))
+            e.Handled = true;
+    }
 
     protected override void OnClosed(EventArgs e)
     {
diff --git a/ImageResize.ContextMenu/Program.cs b/ImageResize.ContextMenu/Program.cs
new file mode 100644
index 0000000..da33093
--- /dev/null
+++ b/ImageResize.ContextMenu/Program.cs
@@ -0,0 +1,16 @@
+using Avalonia;
+
+namespace ImageResize.ContextMenu;
+
+internal static class Program
+{
+    [STAThread]
+    public static int Main(string[] args)
+        => BuildAvaloniaApp().StartWithClassicDesktopLifetime(args);
+
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .WithInterFont()
+            .LogToTrace();
+}
diff --git a/ImageResize.ContextMenu/README.md b/ImageResize.ContextMenu/README.md
index 675fddc..0791a58 100644
--- a/ImageResize.ContextMenu/README.md
+++ b/ImageResize.ContextMenu/README.md
@@ -30,6 +30,16 @@ Windows 11 context menu integration for quick image resizing. Right-click any im
 # Then run: publish\installer\ImageResize-ContextMenu-Setup-1.0.0.exe
 ```
 
+### First install: SmartScreen warning
+
+On first run you'll likely see a **"Windows protected your PC — Unknown publisher"** dialog. This is because the installer isn't yet Authenticode-signed (code signing is on the roadmap). The installer is safe to run; SmartScreen flags any unsigned installer from a publisher it doesn't recognise.
+
+To proceed, use any of:
+
+- Click **More info** → **Run anyway** in the SmartScreen dialog.
+- Right-click the downloaded `.exe` → **Properties** → tick **Unblock** → **OK**, then double-click.
+- In PowerShell, before running: `Unblock-File -Path .\ImageResize-ContextMenu-Setup-*.exe`
+
 ### Usage
 
 **Single Image:**
diff --git a/ImageResize.ContextMenu/app.manifest b/ImageResize.ContextMenu/app.manifest
new file mode 100644
index 0000000..504a4dd
--- /dev/null
+++ b/ImageResize.ContextMenu/app.manifest
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity version="1.0.0.0" name="ImageResize.ContextMenu"/>
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
+    </application>
+  </compatibility>
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true/pm</dpiAware>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
+    </windowsSettings>
+  </application>
+</assembly>

From f6739bcf9a91e6a6de9aa50e326a14a7cd33c88a Mon Sep 17 00:00:00 2001
From: Lee Messenger <lee@aptitude.co.uk>
Date: Sat, 18 Apr 2026 13:36:06 +0100
Subject: [PATCH 2/2] Finish Avalonia port: cross-platform single-instance IPC,
 macOS packaging, CI

Restore the single-instance + arg-forwarding behaviour that was stripped
for the POC, now behind an ISingleInstance abstraction with Windows
(named pipe + mutex) and Unix (domain socket + exclusive lockfile)
implementations. Wire Avalonia's Dispatcher.UIThread.UnhandledException
through MessageBox.Avalonia for parity with the old WPF error dialog.

Pin Tmds.DBus.Protocol to 0.92.0 to clear GHSA-xrw6-gwf8-vvr9 pulled
transitively by Avalonia's Linux stack.

Add build-macos.sh producing a universal (arm64 + x86_64 via lipo)
ImageResize.app bundle and DMG, plus a hand-rolled Automator Quick
Action so macOS users get a Finder right-click -> Services -> Resize
Images entry. CI gains a macos-latest job that produces the DMG as an
artefact on every PR.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 .github/workflows/build.yml                   |  34 +++-
 Directory.Packages.props                      |   4 +
 ImageResize.ContextMenu/App.axaml.cs          | 126 ++++++++++++-
 .../ImageResize.ContextMenu.csproj            |   6 +-
 ImageResize.ContextMenu/README.md             |  51 +++--
 ImageResize.ContextMenu/Services/AppLog.cs    |  40 ++++
 ImageResize.ContextMenu/Services/AppPaths.cs  |  40 ++++
 .../Services/ISingleInstance.cs               |  25 +++
 .../Services/UnixSingleInstance.cs            | 175 ++++++++++++++++++
 .../Services/WindowsSingleInstance.cs         | 133 +++++++++++++
 ImageResize.ContextMenu/macos/Info.plist      |  52 ++++++
 .../Contents/document.wflow                   | 152 +++++++++++++++
 .../ResizeImages.workflow/Contents/info.plist |  27 +++
 README.md                                     |   4 +-
 build-macos.sh                                | 167 +++++++++++++++++
 15 files changed, 1012 insertions(+), 24 deletions(-)
 create mode 100644 ImageResize.ContextMenu/Services/AppLog.cs
 create mode 100644 ImageResize.ContextMenu/Services/AppPaths.cs
 create mode 100644 ImageResize.ContextMenu/Services/ISingleInstance.cs
 create mode 100644 ImageResize.ContextMenu/Services/UnixSingleInstance.cs
 create mode 100644 ImageResize.ContextMenu/Services/WindowsSingleInstance.cs
 create mode 100644 ImageResize.ContextMenu/macos/Info.plist
 create mode 100644 ImageResize.ContextMenu/macos/ResizeImages.workflow/Contents/document.wflow
 create mode 100644 ImageResize.ContextMenu/macos/ResizeImages.workflow/Contents/info.plist
 create mode 100644 build-macos.sh

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b652d57..72eb508 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -42,7 +42,7 @@ jobs:
       - name: Test
         run: dotnet test ImageResize.Tests/ImageResize.Tests.csproj -c Release
 
-  context-menu:
+  context-menu-windows:
     name: ContextMenu (windows)
     runs-on: windows-latest
     steps:
@@ -60,3 +60,35 @@ jobs:
 
       - name: Build
         run: dotnet build ImageResize.ContextMenu/ImageResize.ContextMenu.csproj -c Release --no-restore
+
+  context-menu-macos:
+    name: ContextMenu (macos)
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Restore
+        run: dotnet restore ImageResize.ContextMenu/ImageResize.ContextMenu.csproj
+
+      - name: Build
+        run: dotnet build ImageResize.ContextMenu/ImageResize.ContextMenu.csproj -c Release --no-restore
+
+      - name: Install create-dmg
+        run: brew install create-dmg
+
+      - name: Build universal .app + .dmg
+        run: ./build-macos.sh Release
+
+      - name: Upload DMG artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ImageResize-ContextMenu-macOS
+          path: publish/installer/*.dmg
+          if-no-files-found: error
diff --git a/Directory.Packages.props b/Directory.Packages.props
index 929bcd7..f632e31 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -29,6 +29,10 @@
         <PackageVersion Include="Avalonia.Themes.Fluent" Version="11.2.5" />
         <PackageVersion Include="Avalonia.Fonts.Inter" Version="11.2.5" />
         <PackageVersion Include="Avalonia.Diagnostics" Version="11.2.5" />
+        <PackageVersion Include="MessageBox.Avalonia" Version="3.3.1.1" />
+        <!-- Pin Tmds.DBus.Protocol past GHSA-xrw6-gwf8-vvr9 (fixed in 0.21.0+). Avalonia 11.2.5
+             pulls a vulnerable 0.20.0 transitively; the explicit ref below overrides that. -->
+        <PackageVersion Include="Tmds.DBus.Protocol" Version="0.92.0" />
     </ItemGroup>
 
     <ItemGroup Label="SourceLink">
diff --git a/ImageResize.ContextMenu/App.axaml.cs b/ImageResize.ContextMenu/App.axaml.cs
index f9176e1..8d35731 100644
--- a/ImageResize.ContextMenu/App.axaml.cs
+++ b/ImageResize.ContextMenu/App.axaml.cs
@@ -1,6 +1,8 @@
 using Avalonia;
+using Avalonia.Controls;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
+using Avalonia.Threading;
 using ImageResize.Core.Codecs;
 using ImageResize.Core.Configuration;
 using ImageResize.Core.Interfaces;
@@ -9,32 +11,100 @@
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using MsBox.Avalonia;
+using MsBox.Avalonia.Enums;
 
 namespace ImageResize.ContextMenu;
 
 public partial class App : Application
 {
-    // TODO (post-POC): restore single-instance mutex + named-pipe IPC for multi-select
-    // context-menu invocations. Stripped for the POC so the Avalonia port can be validated
-    // end-to-end without the platform-IPC distraction. Previous implementation in
-    // git history on master (pre-avalonia-port).
-
     public static IServiceProvider Services { get; private set; } = null!;
 
+    private ISingleInstance? _singleInstance;
+    private CancellationTokenSource? _ipcCts;
+
     public override void Initialize() => AvaloniaXamlLoader.Load(this);
 
     public override void OnFrameworkInitializationCompleted()
     {
         ConfigureServices();
+        RegisterExceptionHandlers();
 
         if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
         {
-            desktop.MainWindow = Services.GetRequiredService<MainWindow>();
+            _singleInstance = SingleInstance.Create();
+
+            if (!_singleInstance.TryAcquire())
+            {
+                HandleSecondaryInstance(desktop);
+            }
+            else
+            {
+                HandlePrimaryInstance(desktop);
+            }
         }
 
         base.OnFrameworkInitializationCompleted();
     }
 
+    private void HandleSecondaryInstance(IClassicDesktopStyleApplicationLifetime desktop)
+    {
+        var args = Environment.GetCommandLineArgs().Skip(1).ToArray();
+        AppLog.LogStartupArgs("Secondary instance forwarding", args);
+
+        try
+        {
+            _singleInstance!.ForwardArgs(args);
+        }
+        finally
+        {
+            _singleInstance!.Dispose();
+            _singleInstance = null;
+        }
+
+        desktop.ShutdownMode = ShutdownMode.OnExplicitShutdown;
+        Dispatcher.UIThread.Post(() => desktop.TryShutdown(0));
+    }
+
+    private void HandlePrimaryInstance(IClassicDesktopStyleApplicationLifetime desktop)
+    {
+        var args = Environment.GetCommandLineArgs().Skip(1).ToArray();
+        AppLog.LogStartupArgs("Primary instance", args);
+
+        var mainWindow = Services.GetRequiredService<MainWindow>();
+        desktop.MainWindow = mainWindow;
+
+        _ipcCts = new CancellationTokenSource();
+        _singleInstance!.StartServer(OnArgsReceivedFromSecondary, _ipcCts.Token);
+
+        desktop.Exit += OnDesktopExit;
+    }
+
+    private static void OnArgsReceivedFromSecondary(IReadOnlyList<string> paths)
+    {
+        Dispatcher.UIThread.Post(() =>
+        {
+            if (Current?.ApplicationLifetime is not IClassicDesktopStyleApplicationLifetime desktop) return;
+            if (desktop.MainWindow is not MainWindow mw) return;
+
+            mw.AddFiles(paths);
+            if (mw.WindowState == WindowState.Minimized)
+                mw.WindowState = WindowState.Normal;
+            mw.Activate();
+            mw.Focus();
+        });
+    }
+
+    private void OnDesktopExit(object? sender, ControlledApplicationLifetimeExitEventArgs e)
+    {
+        try { _ipcCts?.Cancel(); } catch (ObjectDisposedException) { }
+        _ipcCts?.Dispose();
+        _ipcCts = null;
+
+        _singleInstance?.Dispose();
+        _singleInstance = null;
+    }
+
     private static void ConfigureServices()
     {
         var services = new ServiceCollection();
@@ -69,6 +139,50 @@ private static void ConfigureServices()
 
         Services = services.BuildServiceProvider();
     }
+
+    private static void RegisterExceptionHandlers()
+    {
+        Dispatcher.UIThread.UnhandledException += OnDispatcherUnhandledException;
+        AppDomain.CurrentDomain.UnhandledException += OnAppDomainUnhandledException;
+        TaskScheduler.UnobservedTaskException += OnUnobservedTaskException;
+    }
+
+    private static void OnDispatcherUnhandledException(object? sender, DispatcherUnhandledExceptionEventArgs e)
+    {
+        AppLog.Write(e.Exception, "Dispatcher unhandled");
+
+        try
+        {
+            var owner = Current?.ApplicationLifetime is IClassicDesktopStyleApplicationLifetime lt ? lt.MainWindow : null;
+            var box = MessageBoxManager.GetMessageBoxStandard(
+                "Resize Images",
+                $"An unexpected error occurred:{Environment.NewLine}{Environment.NewLine}{e.Exception.Message}{Environment.NewLine}{Environment.NewLine}See the log at:{Environment.NewLine}{AppPaths.GetLogFilePath()}",
+                ButtonEnum.Ok,
+                Icon.Error);
+
+            _ = owner is not null
+                ? box.ShowWindowDialogAsync(owner)
+                : box.ShowWindowAsync();
+        }
+        catch (Exception ex)
+        {
+            AppLog.Write(ex, "Failed to show error dialog");
+        }
+
+        e.Handled = true;
+    }
+
+    private static void OnAppDomainUnhandledException(object sender, UnhandledExceptionEventArgs e)
+    {
+        if (e.ExceptionObject is Exception ex)
+            AppLog.Write(ex, $"AppDomain unhandled (terminating={e.IsTerminating})");
+    }
+
+    private static void OnUnobservedTaskException(object? sender, UnobservedTaskExceptionEventArgs e)
+    {
+        AppLog.Write(e.Exception, "Unobserved task exception");
+        e.SetObserved();
+    }
 }
 
 internal sealed class NullImageCache : IImageCache
diff --git a/ImageResize.ContextMenu/ImageResize.ContextMenu.csproj b/ImageResize.ContextMenu/ImageResize.ContextMenu.csproj
index c91d8bf..7d5d0cb 100644
--- a/ImageResize.ContextMenu/ImageResize.ContextMenu.csproj
+++ b/ImageResize.ContextMenu/ImageResize.ContextMenu.csproj
@@ -9,7 +9,8 @@
         <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
         <ApplicationManifest>app.manifest</ApplicationManifest>
         <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
-        <NoWarn>$(NoWarn);CS1591;CA1848;CA1001;CA1822</NoWarn>
+        <!-- AVLN3001: MainWindow has no public parameterless ctor — expected; we always resolve via DI, not the XAML runtime loader. -->
+        <NoWarn>$(NoWarn);CS1591;CA1848;CA1001;CA1822;AVLN3001</NoWarn>
     </PropertyGroup>
 
     <ItemGroup>
@@ -24,6 +25,9 @@
         <PackageReference Include="Avalonia.Themes.Fluent" />
         <PackageReference Include="Avalonia.Fonts.Inter" />
         <PackageReference Include="Avalonia.Diagnostics" Condition="'$(Configuration)' == 'Debug'" />
+        <PackageReference Include="MessageBox.Avalonia" />
+        <!-- Override Avalonia's vulnerable transitive Tmds.DBus.Protocol 0.20.0 (GHSA-xrw6-gwf8-vvr9). -->
+        <PackageReference Include="Tmds.DBus.Protocol" />
         <PackageReference Include="Microsoft.Extensions.DependencyInjection" />
         <PackageReference Include="Microsoft.Extensions.Logging" />
         <PackageReference Include="Microsoft.Extensions.Logging.Debug" />
diff --git a/ImageResize.ContextMenu/README.md b/ImageResize.ContextMenu/README.md
index 0791a58..5b5d1b2 100644
--- a/ImageResize.ContextMenu/README.md
+++ b/ImageResize.ContextMenu/README.md
@@ -1,6 +1,8 @@
 # ImageResize Context Menu
 
-Windows 11 context menu integration for quick image resizing. Right-click any image (or multiple images) and resize them instantly.
+Desktop integration for quick image resizing on **Windows 11** (Explorer context menu) and **macOS** (Finder → Services). Right-click any image — or multiple images — and resize them instantly.
+
+Built on Avalonia UI, so the same binary (modulo per-OS packaging) runs natively on both platforms. No WPF, no Electron.
 
 ## Features
 
@@ -15,10 +17,10 @@ Windows 11 context menu integration for quick image resizing. Right-click any im
 
 ## Quick Start
 
-### For Users (Installing)
+### Windows
 
 **Option 1: Installer (Recommended)**
-1. Download `ImageResize-ContextMenu-Setup-1.0.0.exe`
+1. Download `ImageResize-ContextMenu-Setup-<version>-x64.exe`
 2. Double-click to install
 3. Follow the wizard
 4. Right-click any image → "Resize Images..."
@@ -27,10 +29,31 @@ Windows 11 context menu integration for quick image resizing. Right-click any im
 ```powershell
 # From repository root
 .\build-installer.ps1
-# Then run: publish\installer\ImageResize-ContextMenu-Setup-1.0.0.exe
+# Then run: publish\installer\ImageResize-ContextMenu-Setup-<version>-x64.exe
+```
+
+### macOS
+
+1. Download `ImageResize-ContextMenu-Setup-<version>-universal.dmg`
+2. Open the DMG, drag **ImageResize.app** into `Applications`
+3. Double-click **Resize Images.workflow** — macOS will offer to install it as a Finder Quick Action (copied to `~/Library/Services`)
+4. Right-click any image file in Finder → **Services → Resize Images**
+
+**First launch: Gatekeeper warning.** The app is not Authenticode-signed or notarised (no paid Apple Developer Program account), so Gatekeeper will refuse the first launch with _"ImageResize can't be opened because it is from an unidentified developer"_. Bypass it once:
+
+- In Finder: **right-click** `ImageResize.app` (or the Quick Action) → **Open**, then click **Open** again in the dialog. Subsequent launches are unprompted.
+- Alternative: **System Settings → Privacy & Security → Open Anyway** after the first blocked launch.
+- Or strip the quarantine flag from a terminal: `xattr -dr com.apple.quarantine /Applications/ImageResize.app`.
+
+**To build from source on macOS:**
+```bash
+./build-macos.sh          # produces publish/installer/ImageResize-ContextMenu-Setup-<version>-universal.dmg
+brew install create-dmg   # (optional) nicer DMG layout; falls back to hdiutil without it
 ```
 
-### First install: SmartScreen warning
+The build produces a universal binary (arm64 + x86_64 via `lipo`), so one DMG works on both Apple Silicon and Intel Macs.
+
+### First install on Windows: SmartScreen warning
 
 On first run you'll likely see a **"Windows protected your PC — Unknown publisher"** dialog. This is because the installer isn't yet Authenticode-signed (code signing is on the roadmap). The installer is safe to run; SmartScreen flags any unsigned installer from a publisher it doesn't recognise.
 
@@ -65,10 +88,9 @@ To proceed, use any of:
 
 ### Prerequisites
 
-- Windows 11
-- .NET 9.0 SDK
-- Visual Studio 2022 (optional)
-- Inno Setup 6 (for building installer)
+- .NET 10 SDK
+- **Windows builds:** Windows 10 (1809)+ and Inno Setup 6 for the installer
+- **macOS builds:** macOS 11+ with Xcode command-line tools (`xcode-select --install`) for `lipo`; `brew install create-dmg` for prettier DMGs (optional)
 
 ## Creating the Windows Installer
 
@@ -157,11 +179,12 @@ All methods work correctly and remove:
 
 ### Dependencies
 
-- **ImageResize.Core**: NuGet package (v2.0.0) for image processing
-- **SkiaSharp**: High-performance image codec
-- **Microsoft.Extensions.DependencyInjection**: Service container
-- **Microsoft.Extensions.Logging**: Logging infrastructure
-- **.NET 9.0 Desktop Runtime**: Required for WPF
+- **ImageResize.Core**: image processing engine (project reference)
+- **Avalonia UI 11.2.x**: cross-platform XAML UI toolkit
+- **SkiaSharp**: high-performance image codec (pulled in by Core)
+- **MessageBox.Avalonia**: standard dialog primitives
+- **Microsoft.Extensions.DependencyInjection / Logging**: service container + logging
+- **.NET 10 runtime**: self-contained in Mac builds; required system-wide on Windows
 
 ### Registry Entries
 
diff --git a/ImageResize.ContextMenu/Services/AppLog.cs b/ImageResize.ContextMenu/Services/AppLog.cs
new file mode 100644
index 0000000..0568687
--- /dev/null
+++ b/ImageResize.ContextMenu/Services/AppLog.cs
@@ -0,0 +1,40 @@
+using System.IO;
+
+namespace ImageResize.ContextMenu.Services;
+
+internal static class AppLog
+{
+    public static void Write(string message)
+    {
+        try
+        {
+            File.AppendAllText(
+                AppPaths.GetLogFilePath(),
+                $"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}] {message}{Environment.NewLine}");
+        }
+        catch (IOException) { }
+        catch (UnauthorizedAccessException) { }
+    }
+
+    public static void Write(Exception ex, string context)
+        => Write($"{context}: {ex.GetType().Name}: {ex.Message}");
+
+    public static void LogStartupArgs(string label, string[] args)
+    {
+        string cwd;
+        try { cwd = Environment.CurrentDirectory; }
+        catch (Exception ex) { cwd = $"<error: {ex.GetType().Name}>"; }
+
+        Write($"{label}. argc={args.Length} cwd='{cwd}'");
+        for (var i = 0; i < args.Length; i++)
+        {
+            var a = args[i];
+            bool exists;
+            try { exists = !string.IsNullOrWhiteSpace(a) && File.Exists(a); }
+            catch (Exception) { exists = false; }
+            var ext = string.Empty;
+            try { ext = Path.GetExtension(a ?? string.Empty); } catch (ArgumentException) { }
+            Write($"  arg[{i}] len={(a?.Length ?? 0)} exists={exists} ext='{ext}' value='{a}'");
+        }
+    }
+}
diff --git a/ImageResize.ContextMenu/Services/AppPaths.cs b/ImageResize.ContextMenu/Services/AppPaths.cs
new file mode 100644
index 0000000..7a3aacd
--- /dev/null
+++ b/ImageResize.ContextMenu/Services/AppPaths.cs
@@ -0,0 +1,40 @@
+using System.IO;
+
+namespace ImageResize.ContextMenu.Services;
+
+internal static class AppPaths
+{
+    private const string AppFolder = "ImageResize";
+    private const string SubFolder = "ContextMenu";
+
+    public static string GetUserDataDir()
+    {
+        string root;
+        if (OperatingSystem.IsWindows())
+        {
+            root = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        }
+        else if (OperatingSystem.IsMacOS())
+        {
+            var home = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+            root = Path.Combine(home, "Library", "Application Support");
+        }
+        else
+        {
+            var xdg = Environment.GetEnvironmentVariable("XDG_DATA_HOME");
+            root = !string.IsNullOrEmpty(xdg)
+                ? xdg
+                : Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), ".local", "share");
+        }
+
+        var dir = Path.Combine(root, AppFolder, SubFolder);
+        Directory.CreateDirectory(dir);
+        return dir;
+    }
+
+    public static string GetLogFilePath() => Path.Combine(GetUserDataDir(), "log.txt");
+
+    public static string GetLockFilePath() => Path.Combine(GetUserDataDir(), "instance.lock");
+
+    public static string GetUnixSocketPath() => Path.Combine(GetUserDataDir(), "instance.sock");
+}
diff --git a/ImageResize.ContextMenu/Services/ISingleInstance.cs b/ImageResize.ContextMenu/Services/ISingleInstance.cs
new file mode 100644
index 0000000..934c6e3
--- /dev/null
+++ b/ImageResize.ContextMenu/Services/ISingleInstance.cs
@@ -0,0 +1,25 @@
+namespace ImageResize.ContextMenu.Services;
+
+/// <summary>
+/// Cross-platform single-instance coordinator. On startup, call <see cref="TryAcquire"/>:
+/// a <c>true</c> return means this process is primary and should continue running;
+/// a <c>false</c> return means another process is already primary — forward the command-line
+/// args with <see cref="ForwardArgs"/> and exit.
+/// Primary instances call <see cref="StartServer"/> to receive forwarded args from secondaries.
+/// </summary>
+internal interface ISingleInstance : IDisposable
+{
+    bool TryAcquire();
+
+    void ForwardArgs(IReadOnlyList<string> args);
+
+    void StartServer(Action<IReadOnlyList<string>> onArgsReceived, CancellationToken ct);
+}
+
+internal static class SingleInstance
+{
+    public static ISingleInstance Create()
+        => OperatingSystem.IsWindows()
+            ? new WindowsSingleInstance()
+            : new UnixSingleInstance();
+}
diff --git a/ImageResize.ContextMenu/Services/UnixSingleInstance.cs b/ImageResize.ContextMenu/Services/UnixSingleInstance.cs
new file mode 100644
index 0000000..51d5371
--- /dev/null
+++ b/ImageResize.ContextMenu/Services/UnixSingleInstance.cs
@@ -0,0 +1,175 @@
+using System.IO;
+using System.Net.Sockets;
+using System.Text;
+
+namespace ImageResize.ContextMenu.Services;
+
+/// <summary>
+/// Unix single-instance coordinator: an exclusive lockfile (held for the lifetime of the
+/// primary process) + a Unix domain socket that secondaries connect to when forwarding args.
+/// </summary>
+internal sealed class UnixSingleInstance : ISingleInstance
+{
+    private const int ClientConnectTimeoutMs = 2000;
+    private const int ClientRetryAttempts = 5;
+    private const int ClientRetryDelayMs = 200;
+
+    private FileStream? _lock;
+    private Socket? _server;
+
+    public bool TryAcquire()
+    {
+        var path = AppPaths.GetLockFilePath();
+        try
+        {
+            _lock = new FileStream(
+                path,
+                FileMode.OpenOrCreate,
+                FileAccess.ReadWrite,
+                FileShare.None,
+                bufferSize: 1,
+                FileOptions.DeleteOnClose);
+            return true;
+        }
+        catch (IOException)
+        {
+            return false;
+        }
+        catch (UnauthorizedAccessException)
+        {
+            return false;
+        }
+    }
+
+    public void ForwardArgs(IReadOnlyList<string> args)
+    {
+        if (args.Count == 0) return;
+
+        var socketPath = AppPaths.GetUnixSocketPath();
+        var endpoint = new UnixDomainSocketEndPoint(socketPath);
+
+        for (var attempt = 0; attempt < ClientRetryAttempts; attempt++)
+        {
+            Socket? client = null;
+            try
+            {
+                client = new Socket(AddressFamily.Unix, SocketType.Stream, ProtocolType.Unspecified);
+                using var connectCts = new CancellationTokenSource(ClientConnectTimeoutMs);
+                try
+                {
+                    client.ConnectAsync(endpoint, connectCts.Token).AsTask().GetAwaiter().GetResult();
+                }
+                catch (OperationCanceledException)
+                {
+                    throw new TimeoutException("Unix socket connect timed out");
+                }
+
+                using var stream = new NetworkStream(client, ownsSocket: false);
+                using var writer = new StreamWriter(stream, new UTF8Encoding(false)) { AutoFlush = true };
+                foreach (var a in args)
+                {
+                    if (File.Exists(a))
+                    {
+                        AppLog.Write($" -> send '{a}'");
+                        writer.WriteLine(a);
+                    }
+                }
+                writer.WriteLine();
+                return;
+            }
+            catch (TimeoutException ex)
+            {
+                AppLog.Write(ex, $"IPC forward attempt {attempt + 1}: socket busy");
+            }
+            catch (SocketException ex)
+            {
+                AppLog.Write(ex, $"IPC forward attempt {attempt + 1}");
+            }
+            catch (IOException ex)
+            {
+                AppLog.Write(ex, $"IPC forward attempt {attempt + 1}");
+            }
+            finally
+            {
+                try { client?.Dispose(); } catch (ObjectDisposedException) { }
+            }
+            Thread.Sleep(ClientRetryDelayMs);
+        }
+
+        AppLog.Write("IPC forward failed after retries; giving up.");
+    }
+
+    public void StartServer(Action<IReadOnlyList<string>> onArgsReceived, CancellationToken ct)
+    {
+        var socketPath = AppPaths.GetUnixSocketPath();
+
+        // A stale socket file from a previous crash would block bind() with EADDRINUSE — remove it.
+        // We hold the exclusive lockfile, so no live primary is using this path.
+        try { if (File.Exists(socketPath)) File.Delete(socketPath); }
+        catch (IOException ex) { AppLog.Write(ex, "Removing stale socket"); }
+
+        _server = new Socket(AddressFamily.Unix, SocketType.Stream, ProtocolType.Unspecified);
+        _server.Bind(new UnixDomainSocketEndPoint(socketPath));
+        _server.Listen(backlog: 8);
+
+        ct.Register(() =>
+        {
+            try { _server?.Close(); } catch (ObjectDisposedException) { }
+            try { if (File.Exists(socketPath)) File.Delete(socketPath); } catch (IOException) { }
+        });
+
+        _ = Task.Run(async () =>
+        {
+            while (!ct.IsCancellationRequested)
+            {
+                Socket? client = null;
+                try
+                {
+                    client = await _server.AcceptAsync(ct).ConfigureAwait(false);
+                    using var stream = new NetworkStream(client, ownsSocket: true);
+                    using var reader = new StreamReader(stream, Encoding.UTF8, detectEncodingFromByteOrderMarks: true);
+
+                    var received = new List<string>();
+                    string? line;
+                    while ((line = await reader.ReadLineAsync(ct).ConfigureAwait(false)) != null)
+                    {
+                        if (string.IsNullOrWhiteSpace(line)) break;
+                        if (File.Exists(line)) received.Add(line);
+                    }
+
+                    if (received.Count > 0)
+                    {
+                        AppLog.Write($"IPC received {received.Count} file(s). First='{received[0]}'");
+                        onArgsReceived(received);
+                    }
+                }
+                catch (OperationCanceledException)
+                {
+                    break;
+                }
+                catch (SocketException ex)
+                {
+                    AppLog.Write(ex, "IPC server socket error");
+                }
+                catch (IOException ex)
+                {
+                    AppLog.Write(ex, "IPC server I/O error");
+                }
+                catch (ObjectDisposedException)
+                {
+                    break;
+                }
+            }
+        }, ct);
+    }
+
+    public void Dispose()
+    {
+        try { _server?.Close(); } catch (ObjectDisposedException) { }
+        _server = null;
+
+        // FileOptions.DeleteOnClose removes the lockfile; closing the stream releases the exclusive lock.
+        try { _lock?.Dispose(); } catch (IOException) { }
+        _lock = null;
+    }
+}
diff --git a/ImageResize.ContextMenu/Services/WindowsSingleInstance.cs b/ImageResize.ContextMenu/Services/WindowsSingleInstance.cs
new file mode 100644
index 0000000..d212ec7
--- /dev/null
+++ b/ImageResize.ContextMenu/Services/WindowsSingleInstance.cs
@@ -0,0 +1,133 @@
+using System.IO;
+using System.IO.Pipes;
+using System.Runtime.Versioning;
+using System.Security.Principal;
+using System.Text;
+
+namespace ImageResize.ContextMenu.Services;
+
+[SupportedOSPlatform("windows")]
+internal sealed class WindowsSingleInstance : ISingleInstance
+{
+    private const string MutexName = @"Global\ImageResize.ContextMenu.SingleInstance";
+    private const int ClientConnectTimeoutMs = 2000;
+    private const int ClientRetryAttempts = 5;
+    private const int ClientRetryDelayMs = 200;
+
+    private Mutex? _mutex;
+    private bool _ownsMutex;
+
+    public bool TryAcquire()
+    {
+        _mutex = new Mutex(initiallyOwned: true, name: MutexName, createdNew: out var createdNew);
+        _ownsMutex = createdNew;
+        return createdNew;
+    }
+
+    public void ForwardArgs(IReadOnlyList<string> args)
+    {
+        if (args.Count == 0) return;
+
+        var pipeName = GetPipeName();
+        for (var attempt = 0; attempt < ClientRetryAttempts; attempt++)
+        {
+            try
+            {
+                using var client = new NamedPipeClientStream(
+                    ".", pipeName, PipeDirection.Out, PipeOptions.Asynchronous);
+                client.Connect(ClientConnectTimeoutMs);
+
+                using var writer = new StreamWriter(client, new UTF8Encoding(false)) { AutoFlush = true };
+                foreach (var a in args)
+                {
+                    if (File.Exists(a))
+                    {
+                        AppLog.Write($" -> send '{a}'");
+                        writer.WriteLine(a);
+                    }
+                }
+                writer.WriteLine();
+                client.Flush();
+                return;
+            }
+            catch (TimeoutException ex)
+            {
+                AppLog.Write(ex, $"IPC forward attempt {attempt + 1}: pipe busy");
+            }
+            catch (IOException ex)
+            {
+                AppLog.Write(ex, $"IPC forward attempt {attempt + 1}");
+            }
+            Thread.Sleep(ClientRetryDelayMs);
+        }
+
+        AppLog.Write("IPC forward failed after retries; giving up.");
+    }
+
+    public void StartServer(Action<IReadOnlyList<string>> onArgsReceived, CancellationToken ct)
+    {
+        var pipeName = GetPipeName();
+
+        _ = Task.Run(async () =>
+        {
+            while (!ct.IsCancellationRequested)
+            {
+                try
+                {
+                    await using var server = new NamedPipeServerStream(
+                        pipeName,
+                        PipeDirection.In,
+                        NamedPipeServerStream.MaxAllowedServerInstances,
+                        PipeTransmissionMode.Byte,
+                        PipeOptions.Asynchronous);
+
+                    await server.WaitForConnectionAsync(ct).ConfigureAwait(false);
+
+                    using var reader = new StreamReader(server, Encoding.UTF8, detectEncodingFromByteOrderMarks: true);
+                    var received = new List<string>();
+                    string? line;
+                    while ((line = await reader.ReadLineAsync(ct).ConfigureAwait(false)) != null)
+                    {
+                        if (string.IsNullOrWhiteSpace(line)) break;
+                        if (File.Exists(line)) received.Add(line);
+                    }
+
+                    if (received.Count > 0)
+                    {
+                        AppLog.Write($"IPC received {received.Count} file(s). First='{received[0]}'");
+                        onArgsReceived(received);
+                    }
+                }
+                catch (OperationCanceledException)
+                {
+                    break;
+                }
+                catch (IOException ex)
+                {
+                    AppLog.Write(ex, "IPC server I/O error");
+                }
+                catch (ObjectDisposedException)
+                {
+                    break;
+                }
+            }
+        }, ct);
+    }
+
+    public void Dispose()
+    {
+        if (_ownsMutex && _mutex is not null)
+        {
+            try { _mutex.ReleaseMutex(); }
+            catch (ApplicationException) { }
+        }
+        _mutex?.Dispose();
+        _mutex = null;
+    }
+
+    private static string GetPipeName()
+    {
+        var sid = WindowsIdentity.GetCurrent()?.User?.Value ?? "Default";
+        return $"ImageResize.ContextMenu.Pipe.{sid}";
+    }
+}
diff --git a/ImageResize.ContextMenu/macos/Info.plist b/ImageResize.ContextMenu/macos/Info.plist
new file mode 100644
index 0000000..9b9e8d7
--- /dev/null
+++ b/ImageResize.ContextMenu/macos/Info.plist
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleDevelopmentRegion</key>
+    <string>en</string>
+    <key>CFBundleDisplayName</key>
+    <string>Resize Images</string>
+    <key>CFBundleExecutable</key>
+    <string>ImageResize.ContextMenu</string>
+    <key>CFBundleIdentifier</key>
+    <string>co.aptitude.ImageResize</string>
+    <key>CFBundleInfoDictionaryVersion</key>
+    <string>6.0</string>
+    <key>CFBundleName</key>
+    <string>ImageResize</string>
+    <key>CFBundlePackageType</key>
+    <string>APPL</string>
+    <key>CFBundleShortVersionString</key>
+    <string>{VERSION}</string>
+    <key>CFBundleVersion</key>
+    <string>{VERSION}</string>
+    <key>CFBundleIconFile</key>
+    <string>icon.icns</string>
+    <key>LSMinimumSystemVersion</key>
+    <string>11.0</string>
+    <key>LSApplicationCategoryType</key>
+    <string>public.app-category.graphics-design</string>
+    <key>NSHighResolutionCapable</key>
+    <true/>
+    <key>CFBundleDocumentTypes</key>
+    <array>
+        <dict>
+            <key>CFBundleTypeName</key>
+            <string>Image</string>
+            <key>CFBundleTypeRole</key>
+            <string>Editor</string>
+            <key>LSHandlerRank</key>
+            <string>Alternate</string>
+            <key>LSItemContentTypes</key>
+            <array>
+                <string>public.jpeg</string>
+                <string>public.png</string>
+                <string>com.compuserve.gif</string>
+                <string>public.webp</string>
+                <string>com.microsoft.bmp</string>
+                <string>public.tiff</string>
+            </array>
+        </dict>
+    </array>
+</dict>
+</plist>
diff --git a/ImageResize.ContextMenu/macos/ResizeImages.workflow/Contents/document.wflow b/ImageResize.ContextMenu/macos/ResizeImages.workflow/Contents/document.wflow
new file mode 100644
index 0000000..18a0315
--- /dev/null
+++ b/ImageResize.ContextMenu/macos/ResizeImages.workflow/Contents/document.wflow
@@ -0,0 +1,152 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>AMApplicationBuild</key>
+    <string>519</string>
+    <key>AMApplicationVersion</key>
+    <string>2.10</string>
+    <key>AMDocumentVersion</key>
+    <string>2</string>
+    <key>actions</key>
+    <array>
+        <dict>
+            <key>action</key>
+            <dict>
+                <key>AMAccepts</key>
+                <dict>
+                    <key>Container</key>
+                    <string>List</string>
+                    <key>Optional</key>
+                    <true/>
+                    <key>Types</key>
+                    <array>
+                        <string>com.apple.cocoa.path</string>
+                    </array>
+                </dict>
+                <key>AMActionVersion</key>
+                <string>2.0.3</string>
+                <key>AMApplication</key>
+                <array>
+                    <string>Automator</string>
+                </array>
+                <key>AMParameterProperties</key>
+                <dict>
+                    <key>COMMAND_STRING</key>
+                    <dict/>
+                    <key>CheckedForUserDefaultShell</key>
+                    <dict/>
+                    <key>inputMethod</key>
+                    <dict/>
+                    <key>shell</key>
+                    <dict/>
+                    <key>source</key>
+                    <dict/>
+                </dict>
+                <key>AMProvides</key>
+                <dict>
+                    <key>Container</key>
+                    <string>List</string>
+                    <key>Types</key>
+                    <array>
+                        <string>com.apple.cocoa.string</string>
+                    </array>
+                </dict>
+                <key>ActionBundlePath</key>
+                <string>/System/Library/Automator/Run Shell Script.action</string>
+                <key>ActionName</key>
+                <string>Run Shell Script</string>
+                <key>ActionParameters</key>
+                <dict>
+                    <key>COMMAND_STRING</key>
+                    <string>open -n -a "/Applications/ImageResize.app" --args "$@"</string>
+                    <key>CheckedForUserDefaultShell</key>
+                    <true/>
+                    <key>inputMethod</key>
+                    <integer>1</integer>
+                    <key>shell</key>
+                    <string>/bin/bash</string>
+                    <key>source</key>
+                    <string></string>
+                </dict>
+                <key>BundleIdentifier</key>
+                <string>com.apple.RunShellScript</string>
+                <key>CFBundleVersion</key>
+                <string>2.0.3</string>
+                <key>CanShowSelectedItemsWhenRun</key>
+                <false/>
+                <key>CanShowWhenRun</key>
+                <true/>
+                <key>Category</key>
+                <array>
+                    <string>AMCategoryUtilities</string>
+                </array>
+                <key>Class Name</key>
+                <string>RunShellScriptAction</string>
+                <key>InputUUID</key>
+                <string>D3DF1E84-1D2A-4F58-94E0-111111111111</string>
+                <key>Keywords</key>
+                <array>
+                    <string>Shell</string>
+                </array>
+                <key>OutputUUID</key>
+                <string>D3DF1E84-1D2A-4F58-94E0-222222222222</string>
+                <key>UUID</key>
+                <string>D3DF1E84-1D2A-4F58-94E0-333333333333</string>
+                <key>UnlocalizedApplications</key>
+                <array>
+                    <string>Automator</string>
+                </array>
+                <key>arguments</key>
+                <dict/>
+                <key>isViewVisible</key>
+                <integer>1</integer>
+                <key>location</key>
+                <string>309.000000:253.000000</string>
+                <key>nibPath</key>
+                <string>/System/Library/Automator/Run Shell Script.action/Contents/Resources/Base.lproj/main.nib</string>
+            </dict>
+            <key>isViewVisible</key>
+            <integer>1</integer>
+        </dict>
+    </array>
+    <key>connectors</key>
+    <dict/>
+    <key>workflowMetaData</key>
+    <dict>
+        <key>applicationBundleIDsByPath</key>
+        <dict>
+            <key>/System/Library/CoreServices/Finder.app</key>
+            <string>com.apple.finder</string>
+        </dict>
+        <key>applicationPaths</key>
+        <array>
+            <string>/System/Library/CoreServices/Finder.app</string>
+        </array>
+        <key>inputTypeIdentifier</key>
+        <string>com.apple.Automator.fileSystemObject.image</string>
+        <key>outputTypeIdentifier</key>
+        <string>com.apple.Automator.nothing</string>
+        <key>presentationMode</key>
+        <integer>15</integer>
+        <key>processesInput</key>
+        <integer>0</integer>
+        <key>serviceApplicationBundleID</key>
+        <string>com.apple.finder</string>
+        <key>serviceApplicationPath</key>
+        <string>/System/Library/CoreServices/Finder.app</string>
+        <key>serviceInputTypeIdentifier</key>
+        <string>com.apple.Automator.fileSystemObject.image</string>
+        <key>serviceOutputTypeIdentifier</key>
+        <string>com.apple.Automator.nothing</string>
+        <key>serviceProcessesInput</key>
+        <integer>0</integer>
+        <key>systemImageName</key>
+        <string>NSActionTemplate</string>
+        <key>useAutomaticInputType</key>
+        <integer>0</integer>
+        <key>workflowTypeIdentifier</key>
+        <string>com.apple.Automator.servicesMenu</string>
+    </dict>
+</dict>
+</plist>
diff --git a/ImageResize.ContextMenu/macos/ResizeImages.workflow/Contents/info.plist b/ImageResize.ContextMenu/macos/ResizeImages.workflow/Contents/info.plist
new file mode 100644
index 0000000..46d8889
--- /dev/null
+++ b/ImageResize.ContextMenu/macos/ResizeImages.workflow/Contents/info.plist
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>NSServices</key>
+    <array>
+        <dict>
+            <key>NSMenuItem</key>
+            <dict>
+                <key>default</key>
+                <string>Resize Images</string>
+            </dict>
+            <key>NSMessage</key>
+            <string>runWorkflowAsService</string>
+            <key>NSRequiredContext</key>
+            <dict>
+                <key>NSApplicationIdentifier</key>
+                <string>com.apple.finder</string>
+            </dict>
+            <key>NSSendFileTypes</key>
+            <array>
+                <string>public.image</string>
+            </array>
+        </dict>
+    </array>
+</dict>
+</plist>
diff --git a/README.md b/README.md
index 623e33f..9a6ebce 100644
--- a/README.md
+++ b/README.md
@@ -11,8 +11,8 @@ A minimal, cross-platform image resize middleware for .NET Core that provides a
 ### ImageResize.Core (NuGet Package)
 ASP.NET Core middleware for on-the-fly image resizing with disk caching.
 
-### ImageResize.ContextMenu (Windows Application)
-Windows 11 context menu integration for quick image resizing. Right-click any image file and select "Resize Images..." to quickly resize single or multiple images. [See ImageResize.ContextMenu/README.md](ImageResize.ContextMenu/README.md) for installation instructions.
+### ImageResize.ContextMenu (Desktop Application — Windows & macOS)
+Cross-platform desktop shell integration for quick image resizing. On Windows 11, right-click any image file and select "Resize Images..."; on macOS, right-click in Finder and choose Services → Resize Images. Single or multiple images, percentage or exact dimensions. [See ImageResize.ContextMenu/README.md](ImageResize.ContextMenu/README.md) for install instructions on both platforms.
 
 ## Features
 
diff --git a/build-macos.sh b/build-macos.sh
new file mode 100644
index 0000000..1b2ef41
--- /dev/null
+++ b/build-macos.sh
@@ -0,0 +1,167 @@
+#!/usr/bin/env bash
+# Builds a universal (arm64 + x86_64) ImageResize.app bundle and wraps it in a
+# distributable DMG alongside the Finder Quick Action. Must run on macOS — lipo
+# and hdiutil/create-dmg are not available on Linux or Windows.
+#
+# Usage:  ./build-macos.sh [Release|Debug]
+# Output: publish/installer/ImageResize-ContextMenu-<version>-universal.dmg
+
+set -euo pipefail
+
+CONFIG="${1:-Release}"
+ROOT="$(cd "$(dirname "$0")" && pwd)"
+PROJECT="$ROOT/ImageResize.ContextMenu/ImageResize.ContextMenu.csproj"
+MACOS_SRC="$ROOT/ImageResize.ContextMenu/macos"
+
+if [[ "$(uname -s)" != "Darwin" ]]; then
+    echo "ERROR: build-macos.sh must run on macOS (got $(uname -s))." >&2
+    exit 1
+fi
+
+if ! command -v dotnet >/dev/null 2>&1; then
+    echo "ERROR: dotnet SDK not found on PATH." >&2
+    exit 1
+fi
+
+if ! command -v lipo >/dev/null 2>&1; then
+    echo "ERROR: lipo not found (install Xcode command-line tools: xcode-select --install)." >&2
+    exit 1
+fi
+
+# Version from Directory.Build.props — single source of truth, matches assemblies.
+# Uses grep+sed (BSD/GNU compatible) rather than awk's 3-arg match (gawk-only).
+VERSION=$(grep -o '<Version>[^<]*</Version>' "$ROOT/Directory.Build.props" | head -1 | sed -E 's|<Version>(.*)</Version>|\1|')
+if [[ -z "$VERSION" ]]; then
+    echo "ERROR: could not extract <Version> from Directory.Build.props." >&2
+    exit 1
+fi
+
+echo "ImageResize.ContextMenu macOS build"
+echo "  Version: $VERSION"
+echo "  Configuration: $CONFIG"
+echo
+
+OUT_ARM64="$ROOT/publish/osx-arm64"
+OUT_X64="$ROOT/publish/osx-x64"
+OUT_UNIVERSAL="$ROOT/publish/osx-universal"
+APP_DIR="$ROOT/publish/mac/ImageResize.app"
+DMG_STAGE="$ROOT/publish/mac"
+INSTALLER_DIR="$ROOT/publish/installer"
+
+rm -rf "$OUT_ARM64" "$OUT_X64" "$OUT_UNIVERSAL" "$ROOT/publish/mac"
+mkdir -p "$INSTALLER_DIR"
+
+echo "==> Publishing for osx-arm64"
+dotnet publish "$PROJECT" -c "$CONFIG" -r osx-arm64 --self-contained true \
+    -o "$OUT_ARM64" \
+    /p:PublishSingleFile=false \
+    /p:IncludeNativeLibrariesForSelfExtract=true
+
+echo "==> Publishing for osx-x64"
+dotnet publish "$PROJECT" -c "$CONFIG" -r osx-x64 --self-contained true \
+    -o "$OUT_X64" \
+    /p:PublishSingleFile=false \
+    /p:IncludeNativeLibrariesForSelfExtract=true
+
+echo "==> Merging architectures into a universal layout"
+# Start from arm64 as the base, then walk every file in x64 and either lipo-merge
+# Mach-O binaries or leave the arm64 copy in place (managed DLLs are arch-independent).
+cp -R "$OUT_ARM64" "$OUT_UNIVERSAL"
+
+while IFS= read -r -d '' x64_file; do
+    rel="${x64_file#$OUT_X64/}"
+    arm_file="$OUT_ARM64/$rel"
+    uni_file="$OUT_UNIVERSAL/$rel"
+
+    if [[ ! -f "$arm_file" ]]; then
+        # File only exists in x64 — copy across.
+        mkdir -p "$(dirname "$uni_file")"
+        cp "$x64_file" "$uni_file"
+        continue
+    fi
+
+    # Only Mach-O files (main binary + .dylib) need lipo. Text/managed/json stay as-is.
+    if /usr/bin/file -b "$x64_file" | grep -q 'Mach-O'; then
+        arm_archs=$(lipo -archs "$arm_file" 2>/dev/null || echo "")
+        x64_archs=$(lipo -archs "$x64_file" 2>/dev/null || echo "")
+
+        # If either copy is already universal (contains both archs), the published dylib is
+        # shipped as a fat binary (common for SkiaSharp). Prefer that — lipo -create would
+        # refuse when archs overlap.
+        if [[ "$arm_archs" == *"arm64"* && "$arm_archs" == *"x86_64"* ]]; then
+            :  # arm_file is already fat — keep it.
+        elif [[ "$x64_archs" == *"arm64"* && "$x64_archs" == *"x86_64"* ]]; then
+            cp "$x64_file" "$uni_file"
+        else
+            lipo -create "$arm_file" "$x64_file" -output "$uni_file"
+        fi
+    fi
+done < <(find "$OUT_X64" -type f -print0)
+
+echo "==> Assembling $APP_DIR"
+mkdir -p "$APP_DIR/Contents/MacOS" "$APP_DIR/Contents/Resources"
+
+# Info.plist with version substituted in-place.
+sed "s/{VERSION}/$VERSION/g" "$MACOS_SRC/Info.plist" > "$APP_DIR/Contents/Info.plist"
+
+# Bundle all runtime files into Contents/MacOS. The main executable must match CFBundleExecutable.
+cp -R "$OUT_UNIVERSAL"/. "$APP_DIR/Contents/MacOS"/
+chmod +x "$APP_DIR/Contents/MacOS/ImageResize.ContextMenu"
+
+# Icon (optional) — use .icns if present, else fall back to the .ico via best effort.
+if [[ -f "$MACOS_SRC/icon.icns" ]]; then
+    cp "$MACOS_SRC/icon.icns" "$APP_DIR/Contents/Resources/icon.icns"
+elif [[ -f "$ROOT/ImageResize.ContextMenu/Assets/icon.icns" ]]; then
+    cp "$ROOT/ImageResize.ContextMenu/Assets/icon.icns" "$APP_DIR/Contents/Resources/icon.icns"
+else
+    echo "  (no .icns icon found; app will use default Finder icon)"
+fi
+
+# Stage the DMG contents: the .app for drag-install, the Quick Action to double-click install.
+cp -R "$MACOS_SRC/ResizeImages.workflow" "$DMG_STAGE/Resize Images.workflow"
+cat > "$DMG_STAGE/README.txt" <<EOF
+ImageResize for macOS $VERSION
+
+1. Drag ImageResize.app into the Applications folder.
+2. Double-click "Resize Images.workflow" to install the Finder Quick Action.
+   macOS will prompt to install it to ~/Library/Services.
+3. First launch: right-click ImageResize.app in Applications -> Open, then
+   click "Open" again when Gatekeeper warns about the unidentified developer.
+   (One-time step; subsequent launches are unprompted.)
+
+Uninstall:
+  rm -rf /Applications/ImageResize.app
+  rm -rf "\$HOME/Library/Services/Resize Images.workflow"
+  rm -rf "\$HOME/Library/Application Support/ImageResize"
+EOF
+
+DMG_PATH="$INSTALLER_DIR/ImageResize-ContextMenu-Setup-$VERSION-universal.dmg"
+rm -f "$DMG_PATH"
+
+echo "==> Creating $DMG_PATH"
+if command -v create-dmg >/dev/null 2>&1; then
+    create-dmg \
+        --volname "ImageResize $VERSION" \
+        --window-size 600 400 \
+        --icon-size 96 \
+        --icon "ImageResize.app" 150 200 \
+        --icon "Resize Images.workflow" 450 200 \
+        --app-drop-link 300 340 \
+        "$DMG_PATH" \
+        "$DMG_STAGE" \
+        || true  # create-dmg sometimes reports non-zero on AppleScript UI timing but still produces a valid DMG
+fi
+
+# Fallback: hdiutil is guaranteed to be present on macOS.
+if [[ ! -f "$DMG_PATH" ]]; then
+    hdiutil create \
+        -volname "ImageResize $VERSION" \
+        -srcfolder "$DMG_STAGE" \
+        -ov -format UDZO \
+        "$DMG_PATH"
+fi
+
+echo
+echo "Done."
+echo "  DMG:    $DMG_PATH"
+echo "  Size:   $(du -h "$DMG_PATH" | cut -f1)"