Extract audio from video
Nothing is uploaded. The conversion runs here, on this device.
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What this does
A video file is a wrapper holding a picture track and a sound track side by side. Extracting the audio means opening that wrapper, taking the sound, and writing it out on its own. The picture is discarded rather than compressed, which is why what comes out is a small fraction of what went in.
Why it is quicker than it sounds
A 500 MB video usually holds only five or ten megabytes of audio; the rest is picture. Because the picture is thrown away rather than processed, extraction stays quick even on a long recording. And because nothing is uploaded, a two-hour file does not have to travel anywhere before the work can start — on a server-based converter that upload is normally the part that takes the time, not the conversion. The limit here is your own device’s memory rather than somebody else’s size cap.
Start from a specific format
Nothing is uploaded
The conversion happens inside this page. Your file is read by the browser, converted here, and saved straight back to your downloads. It is never sent to a server, so there is no upload wait and no size cap beyond what your own device can hold.
The first conversion is slower
The converter is about 32 MB and downloads the first time you use it, which is the one moment this page is not instant. After that it is cached, and later conversions start immediately, even offline. So do later visits.
Questions
Which video files can I use?
MP4, MOV, MKV and WebM all work, and so do the audio-only files those containers sometimes hold. The converter reads what is actually inside the file rather than trusting the extension, so a mislabelled file usually still opens.
Is the video uploaded anywhere?
No. Open your browser’s developer tools, switch to the network panel and run an extraction: the converter itself downloads once, and your video never becomes a request. That is checkable in about a minute, and it is the whole difference between this and a site that works on a server.
How good will the audio be?
As good as what was already in the video, and no better. The sound in an MP4 or MOV is nearly always AAC, which is lossy, so writing it out as MP3 is a second lossy pass. At 192 kbps or above that second pass is inaudible on ordinary playback; below 128 it is not.