Video to Audio Converter (Extract Audio in Your Browser)
Extract the audio track from an MP4, WebM or MOV file and save it as WAV, right in your browser. No upload, no sign-up, no watermark.
Runs in your browser. Nothing is uploaded.
Example
Input:
interview.mp4 (12 min, stereo, 48 kHz)
Result:
interview.wav: mono, 22.05 kHz, 16-bit PCM, about 32 MB
How the conversion works
Choose a video file and the browser decodes its audio track with the Web Audio API, the same decoder it uses to play the video. The decoded samples are optionally mixed down to mono and resampled, then written into a standard WAV file (16-bit PCM) that every editor, player and transcription service can open. The file never leaves your device: there is no upload, so there is no queue, no size limit set by a server and no copy of your recording on someone else's disk.
Which formats work depends on your browser's built-in codecs. MP4 with AAC audio and WebM with Opus or Vorbis work in all current desktop browsers; MOV files from phones usually work because they contain AAC. If a file cannot be decoded, the tool says so instead of producing an empty file.
Choosing quality and size
WAV is uncompressed, so size grows with length, channels and sample rate. Stereo at 44.1 kHz is about 10 MB per minute; mono at 22.05 kHz is about 2.6 MB per minute and still clear for speech. For podcasts, interviews, lectures and transcription, mono at 22.05 or 16 kHz is plenty. For music, keep stereo at 44.1 or 48 kHz.
Because the whole track is decoded in memory, very long videos need a lot of RAM. A one-hour stereo recording decodes to roughly 1.3 GB of samples, so on phones keep files under about 30 minutes, or trim the video first.
Common uses
Pull the audio out of a screen recording or a Zoom export to send to a transcription service, turn a lecture video into something you can listen to offline, prepare a voice-over for editing, or check what a video's audio track actually contains. Only convert files you own or have permission to use.
If a file plays in your browser but will not convert, its audio codec is probably one the Web Audio decoder does not expose (some MKV and older AVI files). Re-export it as MP4 from your editor or phone, then try again.
Frequently asked questions
Is my video uploaded?
No. Decoding and encoding run in your browser with the Web Audio API. Nothing is sent to a server.
Why WAV and not MP3?
WAV can be written without any codec library, works everywhere and loses no quality. If you need a smaller file, convert the WAV to MP3 or AAC in your audio editor.
Which video formats are supported?
Whatever your browser can decode: MP4 (AAC), WebM (Opus/Vorbis) and most MOV files. Unsupported codecs show an error.
Can I extract audio from a YouTube link?
No. Downloading from YouTube breaks its terms of service. Use a file you recorded or have the rights to.