⚡ Fuk-YT — Free YouTube Video & Audio Downloader for Chrome (Windows)

Download YouTube videos in 1080p/4K, extract MP3 audio, and trim clips — directly from the YouTube page, 100% local and private.

⬇️ Download Latest Release · 🐛 Report a Bug · 💡 Request a Feature

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What is Fuk-YT?

Fuk-YT is a free, open-source YouTube downloader Chrome extension that adds a native-feeling download bar directly under any YouTube video. Unlike online YouTube-to-MP4 converter websites, Fuk-YT runs a lightweight local engine (built in Go, powered by yt-dlp and FFmpeg) on your own PC — so there are no upload limits, no ads, no watermarks, and no third-party server ever touches your video.

Use it to download YouTube videos as MP4/MKV in 1080p, 720p, or 4K, convert YouTube to MP3/M4A/OPUS audio, or trim and export a precise clip with live frame-accurate seeking — all in a couple of clicks.

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📋 Table of Contents

• Key Features
• Screenshots
• Requirements
• Installation Guide
• How to Use
• File Output Location
• Troubleshooting / FAQ
• Tech Stack & Architecture
• Contributing
• License

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🔥 Key Features

• 🎨 Native YouTube UI Integration — embeds a dark-themed control bar right below the YouTube player on any watch page, styled to match YouTube's own 36px pill buttons.
• ⚡ High-Speed Local Downloads — 50–100+ Mbps throughput using stream copy and optimized chunk fetching, since everything runs on your machine instead of a remote server.
• 📹 Universal MP4 Compatibility (H.264/AAC) — every video download is guaranteed to play in Windows Media Player, QuickTime, smart TVs, and NLEs like Premiere Pro and DaVinci Resolve.
• ✂️ Interactive Clip Trimmer with Live Frame Seeking — auto-pauses the YouTube player, then lets you drag start/end handles while the player seeks live so you can preview the exact frame before exporting.
• 🎵 YouTube to MP3 / M4A / OPUS Converter — extract audio at 320k, 256k, 192k, or 128k bitrate in one click.
• 🏷️ Automatic Smart Filenames — outputs are named after the video title with quality tags baked in, e.g. Song Title [1080p].mp4 or Song Title [320k].mp3.
• 📥 Native Chrome Downloads Integration — every file shows up in chrome://downloads and the browser's download shelf like any normal download.
• 🔒 Privacy-First, Fully Local — zero tracking, zero ads, zero telemetry, zero cloud upload. Everything runs through Chrome Native Messaging straight to a local Go binary on your PC.

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🎨 Screenshots

Fuk-YT control bar overview

In-page downloader bar embedded under the YouTube video player

Precision clip trimmer with live frame seeking

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🛠️ Requirements & System Support

Requirement	Details
OS	Windows 10 or Windows 11 (64-bit)
Browser	Google Chrome, Brave, Edge, or any Chromium MV3 browser
Setup	No manual build or coding needed — everything is pre-built in the release package

For contributors who want to build from source, install dev dependencies with winget:

winget install Go.Go.1.22 OpenJS.NodeJS.LTS Git.Git

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🚀 Quick Setup & Installation (No Coding / No Build Required)

Step 1 — Download the Release

1. Go to the Fuk-YT GitHub Releases page.
2. Download the two pre-built zip files from the latest release:
   • 📦 fuk-yt-extension.zip (Chrome Extension)
   • ⚙️ fuk-yt-engine-windows.zip (Local Go Engine)
3. Extract both .zip files to any folder on your PC.

Step 2 — Run the One-Click Engine Installer (one-time only)

1. Open the extracted fuk-yt-engine-windows folder.
2. Double-click install.bat (or right-click → Run as administrator).
3. This registers the local engine in the Windows Registry.

💡 You only need to run install.bat once. The registry entry persists across restarts, so Chrome will keep connecting to the engine automatically afterward.

Step 3 — Load the Extension into Chrome

1. Open chrome://extensions.
2. Enable Developer mode (top-right toggle).
3. Click Load unpacked.
4. Select the extracted fuk-yt-extension folder.

Step 4 — Verify & Enjoy

Open any YouTube video and confirm the Fuk-YT control bar appears below the player with an Engine Ready indicator.

🛠️ Developer / Source Build Instructions

1. Build the Go native host

cd native-host
go mod tidy
go build -ldflags="-s -w" -o bin/native-host.exe ./cmd/host

2. Register the native host manifest

Create/update the registry key HKCU\Software\Google\Chrome\NativeMessagingHosts\com.fukyt.host pointing to the absolute path of native-host/com.fukyt.host.json.

3. Build the extension

cd extension
npm install
npm run build

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📖 How to Use

🎥 Downloading a YouTube Video

1. Open the Video tab on the control bar.
2. Pick a quality (1080p, 720p, 4K).
3. Pick a container (MP4 or MKV).
4. Click Download Video, then open it from the progress card or chrome://downloads.

🎵 Converting YouTube to MP3 / Audio

1. Open the Audio tab.
2. Choose a format (MP3, M4A, OPUS) and bitrate (320k / 256k / 192k / 128k).
3. Click Download Audio.

✂️ Trimming a Precise Clip

1. Open the Clip tab — the YouTube player auto-pauses.
2. Drag the Start/End timeline handles, or type exact MM:SS timestamps. The player seeks live so you can see the exact frame.
3. Click Video Clip or Audio Clip — the clip is cut with H.264 keyframe alignment in seconds.

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📁 File Output Location & Storage

Every download is saved as a single clean file (no duplicates) under:

%USERPROFILE%\Downloads\FUK-YT\
├── Videos/    # Full video downloads (.mp4 / .mkv) with quality tags
├── Audio/     # Audio extractions (.mp3 / .m4a) with bitrate tags
└── Clips/     # Trimmed video & audio clips (.mp4 / .mp3)

Click Open File or Open Folder on any progress card to jump straight to it in File Explorer.

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🔍 Troubleshooting / FAQ

Q: The extension shows "Engine Offline" — how do I fix it? A: The native host registry key or Go binary is missing. Re-run install.bat from the fuk-yt-engine-windows folder as administrator.

Q: The control bar disappeared after a Chrome update or page reload. A: Refresh the extension at chrome://extensions, then reload the YouTube tab (F5).

Q: My download is stuck at 0%. A: The native engine connection was reset. Click Cancel, then Retry on the progress card.

Q: Is Fuk-YT safe to use? Does it collect any data? A: Fuk-YT runs 100% locally — there's no telemetry, no analytics, and no server that sees your video URLs or files.

Q: Does this work on Mac or Linux? A: Not currently — Fuk-YT's local engine is Windows-only today. Mac/Linux support may be considered in future releases; contributions are welcome.

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🏗️ Tech Stack & Architecture

┌─────────────────────────┐         Chrome Native Messaging         ┌──────────────────────────┐
│ Chrome Extension (MV3)  │ ◄─────────────────────────────────────► │  Go Native Engine Host   │
│ React + TypeScript      │   (JSON stdin/stdout IPC protocol)      │  (native-host.exe)       │
└─────────────────────────┘                                         └────────────┬─────────────┘
             │                                                                   │
             ▼                                                                   ▼
┌─────────────────────────┐                                         ┌──────────────────────────┐
│  Injected Content Script│                                         │ yt-dlp & FFmpeg Pipeline │
│  (YouTube DOM Anchor)   │                                         │ (H.264 + Stream Copy)    │
└─────────────────────────┘                                         └──────────────────────────┘

Built with: Go · React · TypeScript · Chrome Extension Manifest V3 · yt-dlp · FFmpeg · Chrome Native Messaging

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🤝 Contributing

Contributions, issues, and feature requests are welcome! Check the issues page or open a pull request.

If Fuk-YT saved you time, consider ⭐ starring the repo — it helps other people find the project.

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📜 License

Distributed under the MIT License. See LICENSE for details.

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Keywords: YouTube downloader Chrome extension · download YouTube videos 1080p 4K · YouTube to MP3 converter · YouTube clip trimmer · yt-dlp GUI · free local YouTube downloader Windows · no ads no server video downloader

Made with ❤️ by SoumyA16-git