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OmniDown

An all-in-one, fast, and free HD video downloader. Supports video downloads from YouTube, TikTok, Douyin, Instagram, Threads, XiaoHongShu, TED, Facebook, X (formerly Twitter), and more. Enjoy seamless, high-quality downloads with no watermarks.

This script contains antifeatures

Before you install, Greasy Fork would like you to know that this script contains antifeatures, which are things there for the script author's benefit, rather than yours.

This script will inject ads on the sites you visit. The author of this script explains: This script uses external services (tool77, savefrom, y2meta, spotifydown, snaptik, ttdownloader, savetik, seekin, fdownloader, boilerplatehub, twittervideodownloader, ssstwitter, sssinstagram, saveclip, fastdl, downreels, storygrab, schatdownloader, pindown, pinpea) as fallback when direct download is blocked by CORS, DRM, or HLS streams. These services may display ads.

How to install

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

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How to install

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

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Author
ksmo
Daily installs
0
Total installs
0
Ratings
0 0 0
Version
2.9
Created
2026-07-11
Updated
2026-07-11
Size
104 KB
License
MIT
Antifeatures
Ads
Applies to

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

Fast, secure, and lightweight userscript to download online videos locally, or redirecting to dedicated external tools when local streams are blocked by CORS/DRM/HLS limits.

Supported Websites & Platforms

  • YouTube: Multiple quality options (Shorts, Embeds, watch videos, audio, subtitles/SRT).
  • TikTok & Douyin: Watermark-free MP4 extraction with fallback options.
  • Instagram: Feed, Reels, Stories, and HLS/Blob streams.
  • X (Twitter): Direct MP4 URLs extractor.
  • Facebook & Threads: Embedded video parsing.
  • Pinterest, Snapchat, TED: Local extraction where possible and site-specific external converters.
  • Spotify: Easy search and download redirects.

Advanced Features

  • Strict Iframe Context Guard: Employs context checking to prevent multi-initialization inside nested ad frames or extensions, restricting global FAB creation to the top-level window.
  • Local-First & Multi-Proxy Download: Downloads videos directly inside your browser whenever possible, utilizing CORS proxies sequentially on network failures.
  • Robust Download Cancellation: Cancels running and queued downloads cleanly, ignoring asynchronous callbacks from aborted connections.
  • Robust JSON Parsing: Uses a bracket-balancing algorithm to extract raw player response variables safely without matching inner strings or nested formats.
  • YouTube base.js Signature Deciphering: Built-in dynamic algorithm decryption for protected streams (including embed and Shorts fallbacks) with automatic redirection fallback recovery when decryption fails.
  • Strict Performance & Execution Scopes: Restricts execution to supported domains only and leverages mutated node batch parsing to eliminate CPU spikes. Backed up with highly relaxed 5-minute idle scan cycles.
  • Native YouTube Player Controls Button: Injects a clean, native SVG download button directly inside YouTube player controls.
  • Clean Memory Management: Maps file sizes and embed configurations inside size-bounded LRU caches to prevent long-term memory leaks.
  • Privacy Confirmations: Never triggers external redirects without explicit user confirmations.
  • Minimized Player & Parallel Downloads: Beautiful, glassmorphic download manager overlay which supports desktop minimization, custom scrollbars, active filename labels, sequential toast queues, and pulsating download indicators.

Controls

  • Floating Button: Appears automatically when a video is loaded on the page (pulses red when downloading).
  • Keyboard Shortcuts:
    • Ctrl + Alt + Shift + D: Open download menu (can be toggled in menu commands).
    • Esc: Close download menu / cancel download.

License

Distributed under the MIT License. Created by ksmo.