MP4 to MP3
Convert MP4 video to MP3 audio.
MP4 to MP3 extracts and encodes audio from an MP4 (or other media) file to MP3 in your browser.
Frequently Asked Questions
Are my media files uploaded?
No. Processing uses ffmpeg.wasm in your browser. Files never leave your device. The first run downloads a ~25MB media engine from a CDN.
Why is the first run slow?
The media engine (~25MB) downloads once per browser session from a CDN, then stays cached.
Which formats work?
Most MP4/WebM/MOV and common audio formats your browser and ffmpeg.wasm can decode. Exotic codecs may fail.