📥 OmniDown — HD Video Downloader (YouTube, TikTok, Instagram, X & More)

OmniDown is a powerful, lightweight, and modern userscript designed to extract and download online videos, audios, and images directly from your browser. It prioritizes direct high-definition local streams and offers seamless one-click fallbacks to Cobalt.tools or dedicated converters when streams are locked by DRM, CORS, or HLS limits.

🚀 What's New in Version 3.2.1?

• TikTok Drawer Panel: The download menu on TikTok is now docked directly next to the control sidebar. It features a smooth, slide-out transition from behind the sidebar, straight right borders, and matches the exact height and frosted-glass style of the main controls.
• TikTok ID Polling Sync: Intercepts console player logs with a 4-second protection lock to prevent rapid scroll events from overwriting the correct active video ID.
• TikTok SPA Navigation: General URL polling keeps the sidebar, username, and video details perfectly synchronized across client-side (SPA) page changes without requiring reloads.
• Cobalt Hash Prefill Fix: Updated Cobalt redirects to pass target URLs via hash fragments (#), enabling automated link pre-filling and download initiation on the Cobalt frontend.
• Clean Link Copying (Instagram & YouTube): The "Copy Link" buttons now fetch clean post/reels page URLs (stripped of tracking metadata like ?igsh= or ?utm_source=) instead of temporary, expiring CDN server links.
• Minimalist YouTube View: Disabled the redundant floating action button (FAB) on YouTube, keeping the player control bar clean and focused.

📸 Interface & Layout Guide

🎵 TikTok Feed Sidebar Integration

The live sidebar automatically binds to the active video in the viewport. Clicking "Download" slides out the quality selection menu from behind the sidebar.

📺 YouTube Integrated Control Menu

A native vector SVG download button is injected directly inside YouTube's player control bar (ytp-right-controls).

🌐 Floating Downloader for Other Websites

On all other supported sites, a clean floating action button (FAB) appears in the bottom right corner to quickly access download options.

🌟 Supported Platforms & Features

📺 YouTube & YouTube Shorts

• Player Bar Integration: Injects a minimalist download button next to settings and captions.
• Signature Deciphering: Built-in dynamic deciphering algorithm for YouTube's base.js protected streams.
• n-Parameter Bypass: Resolves speed throttling automatically to download at full connection speed.
• Playlist Export: Export entire YouTube playlist URLs to a clean .txt file in one click.
• Subtitles: Convert XML subtitles to SRT format and download them natively.

🎵 TikTok & Douyin

• Viewport Tracking: Automatically maps to the active video card using IntersectionObserver.
• API Sniffing: Hooked network requests (XHR/Fetch) capture usernames and watermark-free metadata on the fly.
• Seamless Share Link Copying: Copy clean shareable links without tracking garbage.

📸 Instagram (Reels, Posts, Stories & Carousels)

• Active Slide Detector: Scans carousel posts to identify and download the specific slide currently visible on screen.
• No-CORS Link Cleaner: Extracts and cleans the permanent Reels/Post page URL.
• HLS Stream Fallback: Detects blob streams and routes them to dedicated converters.

🐦 X (Twitter), Facebook & Threads

• Local parser extracts direct MP4 media links from page structures.

🎵 Spotify

• Quick redirect search button to fetch tracks from external audio converters.

🛠️ Download Workflows

1. Direct Download (Local-First): Fetches and saves the media file directly inside your browser. It handles chunked downloading, signature solving, and shows a beautiful glassmorphic progress bar.
2. Cobalt Redirection: Pre-fills and opens Cobalt's clean interface using # parameters. Defaults to cobalt.tools but can be configured to any custom self-hosted instance.
3. External Fallback Resolver: Prompts redirection to trusted external conversion tools (like SnapTik, SSSTik, SaveFrom, FASTDL) when local streams are CORS-blocked or HLS-encoded.

🎮 Shortcuts & Customization

• Ctrl + Alt + Shift + D: Open/close the download menu overlay.
• Esc: Close open overlays or cancel active downloads.
• Tampermonkey Menu Command options:

• 🌐 Change language (English, Portuguese, Spanish, Simplified/Traditional Chinese, Vietnamese).
• ⚙️ Configure custom Cobalt API URL or custom CORS Proxy.
• 🔘 Toggle Floating Action Button visibility.
• 🔘 Toggle Auto-Redirect (instantly go to fallbacks without confirmation prompts).

🔒 Security & Privacy

• Zero Tracking: Processing runs 100% locally in your browser. No telemetry, no analytics, no third-party data tracking.
• Trusted Types Compliant: Safe from XSS injection risks, using secure DOM generation APIs (createElement) instead of dangerous HTML parser APIs.
• LRU Memory Guard: Automatic cleanup of cache maps ensures zero memory leaks when scrolling infinite feeds.