FastStream
Replace website video players with FastStream, a browser extension offering a custom player focused on buffering and accessibility features.
About FastStream
FastStream is a browser extension that replaces video players on websites with a custom player. It downloads video fragments in parallel and pre-downloads video in the background while watching, and can save video as an MP4 file for offline viewing.
It includes subtitle appearance settings with OpenSubtitles support, video brightness and color adjustments, and audio tools such as an equalizer and compressor. It supports MP4, HLS and DASH on most websites including YouTube, but does not support DRM services such as Netflix, Hulu and Amazon Prime.
Key features
- Replaces website video players with custom player
- Downloads video fragments in parallel in background
- Saves videos as MP4 for offline viewing
- Customizable subtitles with OpenSubtitles support
- Adjustable brightness, contrast, hue and color correction
- Audio booster, equalizer, compressor and channel mixer
Best for: People who watch web video on slow connections or need caption, color, and audio adjustments.
Good for
- Works on most websites including YouTube with MP4, HLS and DASH support
- Provides subtitle, color, and audio adjustment options
- Offers offline MP4 saving, screenshots, miniplayer and GIF creation
Watch out for
- Does not work with DRM-protected services such as Netflix, Hulu and Amazon Prime
FastStream at a glance
- Website
- faststream.online
- Category
- Software & Utilities › Media Players & Servers
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Guides for Media Players & Servers
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FastStream FAQ
How does FastStream work?
The extension replaces the video player on websites with its own custom player.
What video formats and sites are compatible?
It supports MP4, HLS and DASH on most websites including YouTube, but not DRM services like Netflix, Hulu and Amazon Prime.
Can videos be saved for offline viewing?
Yes, videos can be saved as an MP4 file for offline viewing.
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