Upload files
Choose a video file.
Video to MP3, in your browser
This tool takes a video file — mp4, mov, mkv, webm, avi, m4v and more — pulls out its audio track, and gives you back an MP3. It is useful for saving a talk, a lecture, a podcast recording or a piece of music when you only need the sound, not the picture.
The conversion runs ffmpeg, compiled to WebAssembly, entirely in your browser. The converter core is about 31 MB and is loaded only the first time you convert, then cached — so the page itself stays light and later conversions start quickly.
Why your video stays on your device
Privacy here is structural, not a promise. There is no upload step because there is no server to upload to:
- The audio is extracted entirely in your browser.
- The page is served as static files and makes no request with your video.
- The source is open and anyone can read it (MIT).
- It works offline after the first load, which is only possible because nothing leaves the device.
If you want to check for yourself, open your browser's Network panel while converting — no request carries your video. Read the source.
How to use it
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Choose a video
Click to select a video file, or drop it anywhere on the page. mp4, mov, mkv, webm, avi, m4v and more are accepted.
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Convert to MP3
Press convert. On the first run the converter core (~31 MB) loads and is cached; after that it is ready and conversions start quickly.
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Download
The MP3 downloads when the audio finishes encoding. The video itself never leaves your device.
FAQ
Is my video uploaded anywhere?
No. The audio is extracted entirely in your browser. There is no server component, so your video has no path off your device. The source is open and you can confirm this in your browser's Network panel.
How does it work without a server?
It runs ffmpeg, compiled to WebAssembly, inside the browser. The converter core is about 31 MB and loads the first time you convert, then is cached. That core does the work the cloud would normally do — but on your own machine.
Why is the first conversion slower?
The first conversion has to download the ~31 MB converter core before it can run. We keep the page itself light by loading the core only when you actually convert. Once it is cached, later conversions skip that step and start quickly.
Which video formats can I use?
Common containers work, including mp4, mov, mkv, webm, avi and m4v. The tool reads the audio track inside the file, so most everyday video files are fine.
Does it edit or shrink the video?
No. This is not a video editor. It only reads the existing audio track and re-encodes it to MP3; it does not transcode or modify the video, and it does not produce a video file.
Does the audio lose quality?
MP3 is a lossy format, so re-encoding is not a bit-perfect copy of the source audio. For speech and most music the result is hard to distinguish from the original at normal listening volumes.
Does it work offline?
Yes. It is a PWA. After the first load it is cached — including the converter core — so it works without a network connection. You can also install it to your home screen.
Is there a file size limit?
There is no fixed limit. Because everything runs in your browser, the practical ceiling depends on your device's memory. Very long or very large videos may be slower.