WindowResizer (WPF) — Fix Shared Window Size for Presentations & Screen Sharing

List open windows • Pick one • Force a consistent window size (e.g., 1280×720 / 1920×1080) • Perfect for screen sharing & demos

Why • Features • How it Works • Getting Started • Build & Release • Localization • Limitations • Contributing • Releases

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Translations

• 🇨🇳 Chinese — README.zh-CN.md
• 🇬🇧 English (this file)
• 🇫🇷 French — README.fr-FR.md
• 🇩🇪 German — README.de-DE.md
• 🇯🇵 Japanese — README.ja-JP.md
• 🇰🇷 Korean — README.ko-KR.md
• 🇵🇹 Portuguese — README.pt-PT.md
• 🇷🇺 Russian — README.ru-RU.md
• 🇪🇸 Spanish — README.es-ES.md
• 🇹🇷 Turkish — README.tr-TR.md

Want to improve translations? PRs are welcome. See Localization.

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What is WindowResizer?

WindowResizer is a lightweight Windows desktop tool (WPF / .NET) that:

1. Lists all currently open, visible windows
2. Lets you select a window
3. Lets you apply a target size (window width × height) using common presets (720p / 1080p / 1440p, etc.) or a custom size

This is especially useful when you:

• frequently present
• do screen sharing
• record demos/tutorials
• stream or teach online

…because a consistent window size makes everything look cleaner:

• your shared window fits nicely in OBS/Meet/Teams/Zoom
• your slides + shared app layout remain stable
• your capture regions don’t need constant tweaking

Important: WindowResizer resizes the window, it does not change the monitor resolution.

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Why this exists

If you share your screen/window often, you already know the pain:

• The same app window becomes slightly different sizes across machines
• Your capture region in OBS shifts when the window is moved or resized
• UI elements appear larger/smaller depending on window size and DPI
• “Just drag the window size” is never consistent and wastes time before every demo

This project was created to make that workflow repeatable and fast:

• pick the window
• pick the size
• done

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Features

Window management

• List open windows (title + process + handle)
• Search/filter by title / process / handle
• Select a window and force a target size

Resolutions

• Quick presets (popular “presentation friendly” sizes)
• Full list of common sizes
• Add your own custom sizes
• Remove custom sizes
• Custom sizes are persisted (saved locally)

UX / UI

• Modern dark UI with custom title bar (Windows 11–style)
• Consistent layout optimized for quick selection + action
• The window list is full-width, aligned, and scrollable
• The app itself includes an icon for a professional look in the taskbar

Localization

• Built-in language packs (XAML ResourceDictionaries)
• Runtime language switching (no restart required)
• RTL support (Arabic) via FlowDirection switching

Privacy by design

• No telemetry
• No analytics
• No network calls
• The app simply uses standard Win32 APIs to enumerate and resize windows

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How it works

Under the hood, WindowResizer uses standard Windows APIs:

• EnumWindows — enumerate top-level windows
• IsWindowVisible, GetWindowText — filter and get titles
• GetWindowThreadProcessId — map windows to process names
• GetWindowRect — read current window size
• SetWindowPos — apply a new width/height (optionally preserving position)
• ShowWindow(SW_RESTORE) — restore if minimized before resizing

The app is DPI-aware (best-effort) so sizes behave more predictably on systems with scaling.

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Getting Started

Requirements

• Windows 10/11
• .NET SDK (recommended: .NET 8 SDK)
• Visual Studio 2022 (optional but convenient) or CLI build with dotnet

Run from source

dotnet restore
dotnet run

Build & Release

Build (Release)

dotnet clean
dotnet build -c Release

Output:

.\bin\Release\net8.0-windows\

Publish (recommended)

Creates a clean distributable folder.

Framework-dependent (smaller, requires .NET runtime installed)

dotnet publish -c Release

Output:

.\bin\Release\net8.0-windows\publish\

Self-contained (bigger, no .NET required)

dotnet publish -c Release -r win-x64 --self-contained true

Output:

.\bin\Release\net8.0-windows\win-x64\publish\

Single-file EXE (optional)

dotnet publish -c Release -r win-x64 --self-contained true `
  -p:PublishSingleFile=true -p:IncludeNativeLibrariesForSelfExtract=true

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Data storage

WindowResizer stores simple local preferences (e.g., language, custom resolutions) under your user profile (AppData).
Nothing is uploaded anywhere.

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Limitations & notes

• Some windows cannot be resized (they may block resizing or ignore SetWindowPos)
• UWP apps, games, and special windows may behave differently
• “Resolution” here means window size (width × height), not monitor resolution
• DPI scaling affects perceived size; the app attempts DPI awareness, but behavior can vary by app

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Why open source matters

Tools that interact with other windows should be transparent.

Open source means:

• anyone can audit what the app does
• there is no hidden telemetry or unexpected behavior
• the community can improve or maintain it long-term

This project is intentionally small, readable, and easy to fork—so it can stay useful for people who rely on stable window sizing in professional workflows.

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License

See the LICENSE file for details.