Extract audio from a video online

Pull the audio track out of a video as WAV (instant, no engine download) or MP3 (smaller). Runs entirely in your browser; the video is never uploaded.

Files stay local .mp4、.m4a、.mov、.webm Max 200MB

Mobile browsers have far less memory: keep files under 50MB. Larger files can be killed mid-way with no error — use a desktop browser for those.

Drop a video to extract its audio
Supports .mp4, .m4a, .mov, .webm ·
MP4, M4A, MOV or WebM, up to 200MB

Options

WAV uses the browser’s built-in decoder: instant, no engine download, but large (~10MB per minute at 16-bit/44.1kHz stereo). MP3 is far smaller but downloads a ~32MB engine on first use.

Applies to MP3 only. Higher bitrate means better sound and a bigger file; 192k is a common balance.

What this tool does

Pull the audio track out of a video and save it as an audio file: drop a video, pick the output format, and start. Everything happens in your browser — the video is never uploaded.

There are two paths. WAV uses the browser’s built-in decoder: instant, with no engine to download, but large — roughly 10MB per minute at 16-bit/44.1kHz stereo. MP3 is far smaller and offers 128k–320k, but it downloads a ~32MB transcoding engine on first use. Choose WAV when you want the result immediately or losslessly; choose MP3 when size matters or you need to send the file on.

Typical uses: turning a meeting recording into audio for the commute, ripping audio from a concert video, or preparing material for a podcast or voiceover. 128k is plenty for speech; 192k or higher for music.

How to use

  1. Drop a video file MP4, M4A, MOV or WebM, up to 200MB each.
  2. Choose the output format Pick WAV for an instant, lossless result; pick MP3 and a bitrate when file size matters.
  3. Choose a quality (MP3 only) Use 128k for speech and meeting notes; 192k or higher for music and anything detail-sensitive.
  4. Wait, then download WAV usually finishes in a second or two. With MP3, the first run downloads the transcoding engine (~32MB), which the browser then caches; long videos take a while.

FAQ

Is my video uploaded?

No. Transcoding runs in your browser via WebAssembly, so the video stays on your device.

Why is the first MP3 run so slow?

Only MP3 needs the ffmpeg WebAssembly core (~32MB), which the browser then caches so later runs start much faster. WAV skips this entirely — it uses the browser’s built-in decoder.

Should I pick WAV or MP3?

Choose WAV for lossless, instant results you will edit further; choose MP3 when size matters or you need to send the file on. WAV is uncompressed: about 10MB per minute at 16-bit/44.1kHz stereo, so an hour-long meeting recording lands near 600MB.

Which bitrate should I pick?

128k for speech and meeting recordings; 192k–320k for music or anything detail-sensitive. Each step up roughly doubles the file size.

Any size or length limits?

Up to 200MB per file. Longer videos are bounded by device memory and may need to be split.

It says there is no audio track — why?

The video has no audio track (a silent screen recording, say) or the codec is unsupported. Try a file that actually carries audio.

Is batch conversion supported?

Not yet — one file at a time.

Limits

Up to 200MB per file; device memory sets the real ceiling (the WAV path decodes the whole track into PCM in memory, which costs noticeably more on long videos).

MP3 output depends on ffmpeg.wasm: the core is downloaded on first use and WebAssembly support is required. WAV output uses the browser’s built-in decoder and downloads nothing.

WAV is uncompressed and therefore large: roughly 10MB per minute at 16-bit/44.1kHz stereo.

Audio extraction only — no trimming, cutting, merging, denoising or loudness normalisation, and no batch mode.

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