MP4 to MP3 Converter
Extract clear MP3 audio from a video, entirely on your device.
Your video is processed locally with ffmpeg.wasm and never uploaded. The engine downloads once on first use.
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How to use MP4 to MP3 Converter
- 1Choose an MP4 or another video file.
- 2Choose the MP3 bitrate.
- 3Select Extract MP3 and let the browser process the video.
- 4Preview and download the audio file.
Extract Audio Locally
Use this converter for interviews, voice recordings, lectures and videos you own. The audio track is decoded and encoded as MP3 in the browser, so the original file does not travel to an upload server.
Frequently asked questions
Does this upload my video?
No. ffmpeg.wasm extracts audio entirely inside your browser.
Which bitrate should I choose?
128 kbps is good for speech, 192 kbps balances size and music quality, and 320 kbps keeps the highest MP3 quality.
Will the first conversion take longer?
Yes. The browser downloads and caches the processing engine, roughly 30 MB, on first use.
Which input formats work?
MP4 is recommended, and many WebM, MOV and common video files can also be decoded.