BrowserTools

MP4 to WAV Converter

Lossless audio extraction from video

By Guga — BrowserTools maintainer, Tbilisi, Georgia Updated 2026-08-12
Free Private No uploads

Expect a one-time download of about 30 MB: the FFmpeg WebAssembly core is pulled from unpkg.com on your first conversion here and cached by the browser from then on. The file you drop stays on your machine throughout.

What is MP4 to WAV Converter?

This hands you the soundtrack of a video as uncompressed PCM in a RIFF/WAVE container — signed 16-bit, little-endian, at whatever sample rate and channel count the file already used. Nothing is re-compressed, so the WAV is an exact copy of the samples the video's encoder left behind. That makes it the right output when a DAW, a hardware sampler or a batch transcription script needs plain audio rather than something it has to decode. The cost is size: 44.1 kHz stereo at 16 bits occupies about 10 MB per minute, so a four-minute talking-head clip lands near 40 MB. If you want a small file instead, the MP4 to MP3 page is the other end of the trade.

Pull uncompressed WAV audio out of MP4 (and other) videos for editing, sampling or analysis. Converted locally with FFmpeg compiled to WebAssembly — nothing is uploaded.

Private MP4 to WAV Converter In Your Browser

MP4 to WAV Converter is processed locally with client-side JavaScript. Your files never touch a server, and there is no queue to wait in.

Step-by-Step

How to use MP4 to WAV Converter

1

Drop a video or an audio file onto the panel; MOV, MKV, WebM and AVI are all accepted alongside MP4.

2

Skip the settings — this page exposes no bitrate or sample-rate control, because nothing is being compressed.

3

Press Extract WAV. The first run in a fresh browser pulls the conversion engine down; subsequent runs skip that step.

4

Play the result in the audio player to confirm, then use the Download WAV button to save it under your original filename.

Key Capabilities
  • Emits uncompressed 16-bit signed PCM rather than a lossy or container-only format.
  • Preserves the source sample rate and channel layout, because no resampling filter is applied.
  • Accepts video containers as well as audio files, so a soundtrack can be lifted without demuxing by hand.
  • Plays back in the built-in audio element before you commit to the download.
Common Use Cases
  • A sound designer chopping a dialogue take out of a short film into 24-bit-friendly 16-bit PCM for a DAW session.
  • A developer feeding a 44.1 kHz WAV into an offline transcription or analysis script that will not decode AAC.
  • A music producer sampling a clean chord out of a rehearsal video without a second lossy encode in the way.
Clear Answers

Frequently Asked Questions

How much bigger will the WAV be than the video?
Much bigger. Uncompressed audio runs at about 176 KB per second in stereo 16-bit at 44.1 kHz, so a one-minute clip is roughly 10 MB and a feature-length film would be well into gigabytes. A 12 MB MP4 often holds half an hour of mono speech that becomes 300 MB of WAV.
Is it truly bit-identical to the video's audio?
It is identical to the decoded audio. A video's soundtrack is already compressed, typically to AAC, so decoding it to PCM and writing that to disk loses nothing further — but it cannot recover detail the original encode discarded either.
Can this produce 24-bit or 32-bit float files?
No. The encoder is fixed at 16-bit signed little-endian PCM, which covers the overwhelming majority of sample playback and editing needs. Headroom is roughly 96 dB below full scale.
Why does the engine download notice appear on a tool with nothing to configure?
Because decoding and muxing still needs a real media engine. The first pass here brings down around 30 MB of FFmpeg compiled to WebAssembly, straight from unpkg.com, and holds on to it afterwards. The file you dropped never goes anywhere.