Extract Audio from Video

Save the soundtrack of a video as M4A, WAV or FLAC on your device, copying AAC audio into M4A without re-encoding it.

Choose a video

or drop it here

The video is processed on this device and never uploaded.

MP4, MOV, WebM, MKV, AVI, WMV, FLV, 3GP, TS / MTS / M2TS or VOB / MPG

Files over 1 GB can be slow. Very large outputs need a browser that can save straight to a file.

How it works

Most MP4 and MOV videos store their sound as AAC. The tool reads the file on your device, drops the video track and copies the AAC packets unchanged into an M4A file (an MP4 container with audio only). Because the audio is never decoded and encoded again, the result sounds exactly like the original and is usually ready within seconds, even for long recordings.

Audio in another codec (Opus or Vorbis from a WebM, MP3, FLAC, PCM) cannot be stored in M4A as is, so it is re-encoded to AAC at 192 kbps. Tick Lossless only if you would rather stop than re-encode. If you want an MP3 instead, use Video to MP3.

For editing or archiving, choose WAV (uncompressed PCM) or FLAC (lossless compression, usually about half to two thirds the size of the WAV). Both keep everything the source has: a lossy source such as AAC is decoded once and stored at 16-bit, 24-bit PCM and lossless sources keep their 24 bits, and floating-point audio stays 32-bit float. They cannot make a lossy source sound better, and they are much larger than the M4A.

The work runs in your browser with Mediabunny (WebCodecs). If this browser cannot read the file, FFmpeg.wasm does the same job more slowly. Either way the file stays on your device.

Supported files

Inputs: Videos in MP4, M4V, MOV, WebM, MKV, AVI and the other formats the converter accepts. The video does not need to play in this browser.
Outputs: M4A with AAC audio (copied when the source is AAC, otherwise re-encoded at 192 kbps), WAV (PCM at the source's precision) or FLAC. Which formats and codecs the app reads and writes: Supported Video Formats.

Limitations

Ogg and Opus outputs are not offered. FLAC needs a browser with a FLAC encoder; elsewhere the slower FFmpeg.wasm engine writes it.
A WAV file is large: about 10 MB per minute of CD-quality stereo, and 512 MB (the in-memory limit) is reached after roughly 45 minutes at 48 kHz stereo 16-bit unless the browser can save straight to a file.
One audio track per file. If the video has several (for example two languages), pick the one you want.
Large outputs are held in memory before download (up to 512 MB, many hours of audio). Desktop Chrome and Edge can write bigger results straight to a file.
Files the browser cannot read are handled by FFmpeg.wasm, which is slower and limited to 2 GB inputs.

Questions

Does extracting the audio lower its quality?

Not when the source audio is AAC, which almost every phone and camera video uses. The packets are then copied byte for byte. Other codecs are re-encoded to AAC, which loses a little quality, and the page tells you which applies before you start.

Why M4A and not MP3?

M4A can hold AAC without converting it, so it is the lossless choice. MP3 always needs a re-encode unless the video already has MP3 audio. If a device or app needs MP3, use Video to MP3.

Can I keep only part of the sound?

Yes. Tick "Only part of the file" and drag the start and end handles. With a lossless copy the cut lands on the nearest audio frame, a few hundredths of a second from the chosen time.

Is my video uploaded anywhere?

No. The file is read and processed by your browser on your device. Only anonymous usage counts (for example "an extraction finished") are sent to analytics, never the file or its name.

Example

A 10 minute phone video of a talk (about 600 MB of 1080p H.264 with 128 kbps stereo AAC) becomes an M4A of roughly 9.6 MB (128 kbps × 600 s ÷ 8). The audio is copied, so it takes a few seconds and sounds identical to the video's soundtrack.