MP4 to MP3
Extract the audio track from an MP4 video and save it as an MP3 file.
Sometimes you only need the audio from a video — pulling a song out of a music video, saving a podcast-style recording's audio separately, or extracting a lecture's spoken content without the accompanying video weight — and that shouldn't require full video editing software.
This tool extracts the audio track directly from an MP4 file and encodes it as a standard MP3, using a real, full-featured video processing engine (ffmpeg, compiled to run in your browser via WebAssembly) rather than a limited simplified script. Because it's genuine ffmpeg running locally, encoding quality and reliability match what desktop conversion software produces.
Since processing runs entirely in your browser rather than uploading to a server, your video never leaves your device — worth noting for anything containing sensitive or private content. Processing time depends on your device's performance and the video's length, with a live progress bar showing conversion status.
How to use MP4 to MP3
- 1
Upload your MP4 video
Drop the video file you want to extract audio from into the upload area.
- 2
Click Extract Audio
Processing runs locally in your browser using a real ffmpeg engine, with a live progress indicator.
- 3
Download your MP3
The extracted audio downloads automatically once processing completes.
Features
- Uses a genuine ffmpeg engine running in-browser via WebAssembly
- No file upload — video is processed entirely on your device
- High-quality MP3 encoding (VBR quality level 2)
- Live progress indicator during processing
Frequently asked questions
Common mistakes to avoid
- Closing the browser tab while processing a long video, which stops the extraction before it completes.
- Expecting instant results for very large or long video files — processing time scales with video length and your device's speed.
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