RaahUPSC · Video Tools
MP4 to WAV
Pull the audio out of an MP4 as an uncompressed WAV, the format audio editors and transcription tools handle most reliably. No further lossy compression is added on top of the source.
✓ No upload · ✓ No sign-up · ✓ No watermark
How to use MP4 to WAV
- Choose one or more .mp4 files.
- Press Convert to WAV; the PCM format is fixed.
- Wait a moment; audio-only output is much quicker than video conversion.
- Download the WAV files, or click Download all to zip them.
Why WAV is the editing-friendly choice
The video track is discarded and the AAC audio in the MP4 is decoded to 16-bit little-endian PCM (pcm_s16le) at its original sample rate and channel count. Because PCM is uncompressed, there is no new compression loss, and every editor, from Audacity to professional DAWs, opens it instantly without codec issues.
The trade-off is size: stereo audio at 48 kHz, typical for video, takes about 11 MB per minute, so a one-hour lecture becomes roughly 660 MB. That is fine for cleaning up a recording, cutting a voice-over or feeding a transcription program, but use MP3 for listening on the go.
Limitations
- WAV cannot recover detail lost in the MP4's original AAC encoding; it only avoids adding more loss.
- Long files produce very large WAVs, which can strain browser memory and phone storage.
- Audio with more than 16-bit depth is reduced to 16-bit.
Frequently asked questions
How big will the WAV be?
Roughly 10–11 MB per minute for stereo at 44.1 or 48 kHz, regardless of how small the MP4 was.
Is WAV better quality than MP3?
It adds no further compression, so it is the better source for editing. For simple listening, a high-quality MP3 sounds the same.
What sample rate does it use?
The same as the MP4's audio, usually 44.1 or 48 kHz. No resampling is requested.
Does the MP4 leave my device?
No. The audio is decoded and saved as WAV inside this page.