Pull the audio track out of a video file

The meeting recording has the audio you need; the screen recording has the sound effect. Decode the video, keep the sound, get a WAV.

Tools used in this guide

The job

You need the audio, not the pixels: a voice memo recorded as video, a clip whose sound you want to edit, a screencast's narration. Browsers decode the video's audio track natively — this taps that decoder and writes the PCM out as a WAV file.

Drop, decode, download

Drop an MP4/WebM/MOV up to 400 MiB. The audio track is decoded through the browser's own decoder and re-encoded as 16-bit WAV at the source sample rate — no quality loss beyond the original compression.

Decoding caps at 30 minutes — the decoded PCM has to fit in memory while it's converted.
If a video has no audio track (screen captures sometimes don't), the tool says so rather than producing silence.

Why WAV

WAV is the lossless hand-off format — it plays everywhere and imports into every editor. For the web, convert the WAV onward to MP3/OGG afterwards; WAV files are large by nature (about 10MB per minute of stereo).