Convert any file, nothing uploaded
Free tools

Free tool

Free MP4 to WAV converter for editing and transcription

Convert MP4 to WAV when the sound is going into an editor or a transcription tool.

Your MP4

Drag a file here, paste it, or choose one.

.mp4, .mov, .webm, .mkv, .m4v, .avi. Up to 500 MB.

Up to 3 hours of audio.

Your file never leaves your browser. The conversion runs on this machine.

Convert to

16 bit PCM, uncompressed. What audio editors and transcription tools expect. About 10 MB a minute in stereo.

WAV is lossless, so there is no bitrate to pick.

More options
Sample rate

Keep the rate the file already has.

Channels

Keep the channels the file already has.

Fade in
Fade out

Trim

Leave both empty to keep the whole file. Seconds like 1:05.5 work too.

Result

Worked example

Measured on our own 17 second policy explainer, saved as 16 kHz mono WAV for transcription.

Source MP4

1.5 MB

WAV, 16 kHz mono

536 KB

The same 17 seconds as 44.1 kHz stereo WAV is 2.9 MB. Speech recognition does not need the extra, so 16 kHz mono is the smaller and better input for a transcription tool.

1. Add your file. 2. Pick the output. 3. Convert in the tab. 4. Listen and download.

What Interlace does

Transcribing a video to rewrite it? Skip a step.

  • Upload the document the video was about
  • Interlace writes the script and narrates it
  • Subtitles come from the narration, no transcription needed
See document to videoMore examples

Real Interlace output, unedited. Shown silent and sped up.

Your file

MP4

policy-briefing.mp4

To WAV, 16 kHz mono

Our data retention policy in three stepsConsulting Line

Questions

Asked and answered

No. The file is read by the page and converted by ffmpeg compiled to WebAssembly, on your own machine. There is no upload step, and closing the tab discards everything.

No. The MP4's sound was compressed when it was recorded, and WAV keeps exactly what is left. The point of WAV is that nothing more is lost: you can cut, edit and export it many times without another round of compression.

Most speech recognition runs at 16 kHz mono, so 16 bit, 16 kHz, mono WAV is the safe choice. It is also less than a fifth of the size of 44.1 kHz stereo. Pick 16 kHz and Mono under More options.

About 10 MB a minute at 44.1 kHz stereo, 11 MB at 48 kHz stereo, and 1.8 MB at 16 kHz mono. The size depends only on the length and those two settings, not on what is in the recording.

WAV is large, so this tool writes WAV files up to 60 minutes long. For a longer recording, split it into parts with the trim fields, or pick MP3 or M4A if it does not have to be uncompressed.

More free tools

MP4 to MP3 converterMP3 to WAV converterAudio converterExtract audio from video

Turn this into a video

Create an account and start from a document, script, or prompt.

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