MP4 to MP3 Converter

Take the soundtrack out of a video and save it as an audio file. The conversion runs on your own device — the video never leaves it.

  • 100% private
  • No sign-up
  • No watermark
  • Unlimited files
Drop a video file hereor tap to browse · one file at a time · nothing is uploaded

    The converter is a one-time download of about 10 MB, which is why it isn't fetched until you ask for it. After that it stays cached. Everything runs on your device — the file is never uploaded, and conversion speed depends on your computer rather than a server.

    What this actually does

    An MP4 file usually contains two streams side by side: the picture and the sound. Extracting audio means discarding the video stream and keeping the audio, re-encoded into a format that audio players understand.

    That is why it is quicker than most video work. Nothing has to re-render the picture — it is simply dropped, and only the soundtrack is processed.

    Why this one downloads a converter first

    Images and PDFs can be handled by machinery already built into your browser. Video cannot — browsers can play video, but they do not expose the tools to re-encode it. So this tool loads a full media converter compiled to run in the browser, which is roughly a 10 MB download.

    It is fetched only when you press the button, never on page load, and your browser caches it afterwards. It is a large one-time cost in exchange for keeping your video off somebody else's server.

    Choosing a quality

    192 kbps is the sensible default — indistinguishable from the source for most listeners on most equipment, at a reasonable file size. 320 kbps is worth it for music you care about on good headphones. 128 kbps is fine for speech, podcasts and lectures, where the extra data buys nothing.

    Bear in mind you cannot exceed the quality of the original. If the video's audio was already compressed at 128 kbps, extracting at 320 kbps produces a larger file containing exactly the same sound.

    Speed and limits

    Conversion happens on your processor, so a laptop will be quicker than a phone and a long file will take longer than a short one. A few minutes of video typically takes seconds; a two-hour recording will take a while.

    Very large files can exhaust the memory a browser tab is allowed, which on a phone means the tab reloads rather than showing an error. If you are working with something over about half a gigabyte, use a computer.

    Frequently asked questions

    Are my files uploaded to a server?

    No. The conversion runs inside your browser using your device's own processor. Your files are never transmitted anywhere, which is why the tool works even if you disconnect from the internet after the page loads.

    Why is there a download the first time?

    Browsers can play video but cannot re-encode it, so the tool loads a media converter compiled to run locally. It is fetched only when you ask for it and cached afterwards — the alternative would be uploading your video to a server.

    Will the audio sound worse than the original?

    At 192 kbps or above the difference is not audible to most people on most equipment. You cannot improve on the original, though — extracting at a higher bitrate than the source was encoded at just makes a bigger file.

    Can I convert a two-hour video?

    On a computer, yes, though it will take a while. On a phone, large files risk running the tab out of memory. Shorter clips are no problem anywhere.

    Does it work with formats other than MP4?

    Yes. MOV, MKV, AVI, WebM and most other common containers work the same way, as do audio-to-audio conversions.

    Is there a file limit or a paywall?

    There is no account, no watermark, and no upload cap. Because your device does the work, the only practical limit is your available memory. The site is funded by ads, not subscriptions.

    Further reading

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