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Free File Converter

Extract audio from video

Pull the soundtrack out of a video file and save it as audio.

Processed in your browser. This file is converted on your device and is never uploaded.

Converter

.mp4, .mov, .webm, .mkv, .avi, .m4v up to 250 MB. You can also drag a file here.

Options

The first conversion downloads a 32 MB audio engine, which is then reused while this page stays open. Conversion runs on your device and is much slower than a desktop program: expect roughly real time for a long recording, and considerably slower on a phone.

The engine is ffmpeg.wasm, an unmodified build of FFmpeg licensed under the GPL, version 2 or later. It is served from this site's own asset domain, because it is too large for the limit our host places on a single file. It receives nothing about your file: it is a program your browser downloads and then runs on your device.

Higher quality means a larger file. This has no effect on WAV or FLAC, which do not discard anything.

No file selected.

About this tool

Pulling the soundtrack out of a recorded lecture, an interview, or a screen recording usually means uploading a large video to a website and waiting twice: once for the upload and once for the conversion. This tool reads the video in your browser and writes out just the audio.

Because nothing is uploaded, the size of the video costs you nothing in waiting, and a confidential recording stays on your device.

Supported formats and limits

Input
.mp4, .mov, .webm, .mkv, .avi, .m4v
Output
.mp3 (audio/mpeg)
Output name
The original name with the chosen format's extension, for example clip.mp4 becomes clip.mp3.
File size limit
250 MB
Processing
In your browser. The file is not uploaded.

How to use it

  1. Choose a video file. MP4, MOV, WebM, MKV, and AVI are accepted.
  2. Pick the audio format you want, and a quality level.
  3. Select Convert. The first conversion downloads the audio engine.
  4. Download the audio file.

Limitations

  • Only the first audio track is extracted. A film with several language tracks gives you one of them, not a choice.
  • The audio is re-encoded rather than copied out untouched, so converting to a lossy format adds a round of loss on top of whatever the video already had.
  • Video, subtitles, and chapters are discarded. The output is an audio file.
  • Some codecs used inside video containers may not be supported by the bundled engine. A file that cannot be decoded fails with an explanation rather than producing silence.
  • Large videos can exhaust memory, particularly on phones. The limit is 250 MB, and a long recording will be slow.
  • The first conversion downloads a 32 MB engine.

Frequently asked questions

Is my video uploaded?
No. The video is read and decoded entirely in your browser. The only network request is for the conversion engine, which carries nothing about your file.
Why is this faster than other sites?
Because there is no upload. Sending a 500 MB video to a server is usually much slower than converting it, and here that step does not exist.
Which format should I pick?
MP3 for something that has to play anywhere, such as a recording you are sending on. Opus if the size matters and you control the player.
Can I keep the original audio untouched?
Not currently. The audio is always re-encoded into the format you choose, rather than being copied out of the container as-is.

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