Convert MP4 to WAV Free

The rule for pulling audio out of video is simple: MP3 if you only want to listen, WAV if you are going to work on it. Anything that involves editing — cleaning dialogue from an interview, isolating a sound effect, denoising a lecture, sampling music from a clip, laying the audio into a timeline — wants WAV, and there is a concrete reason why.

The audio inside an MP4 is almost always AAC, which is already lossy. Extract it to MP3 and you re-encode lossy-to-lossy, stacking a second generation of loss before you have made a single edit — and your editor will likely add a third when you export. Extract to WAV and the AAC is decoded exactly once into uncompressed PCM; from that moment every cut, EQ move, compressor, and export operates on raw samples and costs you nothing further.

WAV also simply behaves better inside editing software. It scrubs instantly, cuts sample-accurately, and imports into every DAW, video editor, and transcription tool ever written, on every platform — no codec surprises, no wrong durations, no timing offsets.

The cost is size: roughly 10 MB per stereo minute, which is around 5-10× larger than the AAC track it came from. For a working file that is irrelevant. Edit in WAV, export once to a compressed format at the end, and your audio passes through exactly one final compression step.

Nothing is uploaded — the extraction runs in your browser with FFmpeg compiled to WebAssembly, so even a large or private video stays on your own machine. Output is standard 16-bit PCM at the source's sample rate, typically 48 kHz for video audio.