AnyFormat

00 Utility

Video to MP3

One page for MP4, MOV, MKV, WebM and the rest.

Drop files or a folder here

or choose from your device · paste with ⌘V / Ctrl+V

.mp4 .mov .mkv .webm .m4v .avi .ogv .3gp .ts

03Options 5

Right for speech, wrong for music. At a fixed quality the file size does not change — but mono tolerates a much lower quality than stereo, so combine the two to actually shrink the file.

Leave at 0 for the whole file.

0 means run to the end.

  • No upload The conversion runs in this tab. Your file never travels — not to us, and not to the advertising.
  • No sign-up, no email, no daily cap There is no account system to sign up to.
  • No size limit we invented Only your device's memory — about ~2 GB on a desktop browser, ~400 MB on a phone.
  • Turn your Wi-Fi off and convert anyway The conversion needs nothing but this page. Ads will not load without a connection; your file will still convert. That is the whole claim, and it takes five seconds to check.

Extracts the audio track from a video and writes it as MP3, whatever the container. Drop an MP4, MOV, MKV, WebM or M4V — the format is detected from the file itself rather than from its extension.

The video is never decoded

Extracting audio means finding the audio track in the container and decoding only that. The video track is discarded before anything touches it.

The practical consequence: it works on files this browser could not play. An iPhone recording is HEVC and a ProRes export from Final Cut is not decodable in any browser, and both give up their audio without complaint.

Which containers are read

MP4, MOV, M4V, MKV, WebM, Ogg and MPEG-TS. AVI files are read when their audio is MP3 or PCM, which most are.

The format is identified from the file's own bytes, so a mislabelled extension does not matter. If the container genuinely is not supported you are told which one it is.

Formats a browser genuinely cannot read

The decoding here is the browser's own, which is fast and needs no download — and which has real gaps.

WMA (Windows Media Audio), AC-3 and DTS (cinema surround tracks), AMR (old phone voice recordings) and RealAudio are not decodable by any browser. If your file uses one you are told which, rather than being left with a failure that says nothing.

HEVC video cannot be decoded either — but that does not matter here. Extracting audio discards the video track before anything tries to decode it, so an iPhone recording converts perfectly well even though the browser could not play its picture.

How MP3 encoding works without a server

Browsers decode MP3 but do not encode it — there is no MP3 encoder in WebCodecs. The encoding here is LAME, the reference open-source MP3 encoder, compiled to WebAssembly and loaded only when you actually convert to MP3.

It is the same encoder desktop software has used for twenty years, producing standard files that play everywhere. Because it is fetched on demand, pages that convert to WAV or M4A never download it.

Other names for this

Also searched as “extract audio from video”, “convert video to audio”, “rip audio from video”.

Questions

Which video formats work?
MP4, MOV, M4V, MKV, WebM, Ogg and MPEG-TS, plus most AVI files. The container is detected from the file rather than the extension.
Does the video codec matter?
No. It is discarded before decoding, so HEVC and ProRes files work even though the browser cannot play them.
Can I convert a whole folder?
Yes. Drop the folder and every video in it is processed, keeping its name.
Why does my purchased file fail?
If it is DRM-protected — an Apple Music download, an Audible book, a rented film — it cannot be converted. That is what the protection is for, and no converter can or should get around it.
Is my file uploaded?
No. The demuxing, decoding and encoding all happen in this tab using the browser’s own media stack plus a WebAssembly encoder. A recording can be an interview, a lecture, a private call — none of it is transmitted. Turn your Wi-Fi off after the page loads and it still works.
How large a file can I convert?
There is no imposed limit, only your device’s memory — around 2 GB in a desktop browser and 400 MB on a phone, since the file is held in memory while it converts. A two-hour video converts in well under a minute on a laptop.