How to extract audio from a video
- Choose a local MP4 or WebM file. The source must be no larger than 50 MiB and no longer than five minutes. Wait until its name, duration and video preview appear.
- Play the source if you want to check its sound, then choose Extract audio. Keep this tab open while decoding and WAV encoding finish.
- Listen to the audio in Result. Check its duration and channel count, then choose Download WAV. The preview and download use the same generated audio.
What the WAV contains
This tool decodes a video’s audio track and writes an uncompressed, 16-bit PCM WAV at 44,100 samples per second. Mono stays mono and stereo stays stereo. It does not record your microphone, play the video in real time to capture it, or upload the source. Extraction may finish faster or slower than the video depending on your device.
WAV is useful for listening to a short recording or bringing its sound into an editor. It is normally larger than compressed audio: a minute of stereo output takes about 10.1 MiB. Decoding and resampling do not recover detail that the source codec has already lost. This is not a lossless copy of the original compressed track.
Two practical examples
A 30-second stereo video produces about 5 MiB of WAV audio. You receive the whole decoded audio track, without its pictures or subtitles. Use the player to confirm that the first and last sounds are present before saving.
A one-minute mono clip produces about 5 MiB rather than twice that amount. If a clip has an audio track containing only digital silence, the result includes a silence notice; the WAV can still be saved. A video with no decodable audio track gives an error instead.
Limits and troubleshooting
MP4 and WebM are containers, not promises about codecs. MP4 with H.264 video and AAC audio, or WebM with VP8 video and Opus audio, are useful starting points, but your browser must decode the actual file. A renamed file is not converted. A damaged source, unreadable duration or unsupported track cannot be repaired here. Audio with more than two channels is rejected instead of silently discarding channels.
The 50 MiB and five-minute limits apply to the whole source. Large compressed files can still require substantial memory when decoded; use a smaller clip if the browser runs out of resources. Output is WAV only, with no trimming, volume adjustment, MP3 encoding, URL downloading or speech transcription. Only one browser-decoded audio track is extracted.
Cancel discards the running result. Selecting another file or Remove immediately disables the old download. A rejected replacement preserves the previous valid source so you can try again. Closing or reloading the page removes the in-memory work; save the WAV before leaving.
Frequently asked questions
Why does my MP4 fail even though another MP4 works?
The internal codecs, track layout or file integrity can differ. Try a small video exported with a browser-compatible audio codec. Changing the extension will not help.
Does this separate speech from music?
No. Speech, music and background noise that are mixed into the track remain mixed. A silent source cannot be turned into audible speech.
Why is the WAV duration slightly different?
Audio and video tracks can have different lengths. The reported output duration describes the decoded audio; encoding delays and codec padding may also affect the edges. Check the result by listening.
Where are the files stored?
Processing takes place in this browser tab. The tool does not keep a server copy or a project history. Download WAV saves through your browser’s normal download location.