Audio converter
MP4 to WAV Converter
WAV is the uncompressed PCM audio format, the lingua franca of music production, broadcast audio, and scientific recording. Converting MP4 to WAV means decoding the AAC or other compressed audio in the MP4 into raw PCM samples, then wrapping those samples in a WAV container. The output file is 5 to 10 times larger than the source MP4 because WAV carries no compression, but every sample is preserved exactly as decoded from the AAC.
MP4 to WAV in detail
The main reason to choose WAV over MP3 or AAC for MP4 audio extraction is editing workflow. Audio editors like Logic Pro, Pro Tools, Audition, Reaper, and Audacity treat WAV as a first-class citizen. Edits, cuts, EQ, compression, and automation applied to a WAV preserve full fidelity. Editing a re-encoded MP3 introduces compression artifacts that accumulate across each export cycle. Mastering engineers and film dubbing workflows always prefer WAV intermediate files.
Because WAV files are uncompressed, they are also useful for machine-learning input to speech-to-text models. Whisper, AssemblyAI, Deepgram, and most other ASR engines internally decode the audio to PCM, and providing WAV directly removes one source of decoding ambiguity.
MP4 to WAV specifics
| Setting | Value | Notes |
|---|---|---|
| Input | MP4 with AAC or other audio | Most MP4s are AAC LC from cameras or phones. |
| Output container | WAV (Microsoft PCM) | Universal uncompressed audio format. |
| Output encoding | 16-bit PCM, source sample rate | 44.1 or 48 kHz for most sources. |
| File size ratio | Roughly 5-10x the source MP4 | WAV has no compression. |
| Professional default | 24-bit PCM at 48 kHz | Advanced tool supports 24-bit upgrade. |
| Editing workflow | Drag into any DAW | First-class support in all audio editing software. |
When to use this conversion
Podcast editor hand-off
Export MP4 recording audio as WAV for an editor who mixes in Logic Pro or Pro Tools where lossless source is the studio norm.
Mastering chain input
Provide an uncompressed WAV master to a mastering engineer rather than a pre-compressed MP3 that locks in decisions.
Whisper and ASR transcription
Feed WAV to speech-to-text models to remove one decoding step from their pipeline for maximum accuracy.
Film dubbing and ADR
ADR and dubbing workflows require lossless WAV intermediates; extract from the MP4 source for reference tracks.
Archival master copy
Store a WAV alongside the MP4 as the canonical audio archive, safe from future codec deprecation.
Frequently asked questions
Why would I convert MP4 to WAV?
The main reasons are professional audio editing, mastering, transcription, and archival. WAV is uncompressed, so it preserves every sample of the decoded source without further quality loss from MP3 or AAC re-encoding. Editors working in DAWs like Logic Pro or Pro Tools expect WAV input.
Does WAV preserve audio quality from MP4?
WAV preserves the audio exactly as decoded from the MP4. The decoded PCM is bit-identical to what the MP4 audio decoder produces. Note that the MP4 source was almost certainly compressed from an even earlier master, so WAV preserves the decoded AAC, not the original studio recording.
How big is a WAV compared to MP4?
A WAV extracted from an MP4 is 5 to 10 times the audio-only size of the source. A one-minute MP4 with 128 kbps AAC audio is about 1 MB; its WAV extraction is about 10 MB. The multiplier depends on sample rate and bit depth; 48 kHz 24-bit WAVs are larger than 44.1 kHz 16-bit.
Can I reduce the WAV file size?
Not without going back to a compressed format. WAV is uncompressed by definition. For a near-lossless alternative with smaller files, use MP4 to FLAC instead. FLAC achieves about 50 to 60 percent of WAV size with bit-identical reconstruction.
What sample rate does the WAV use?
The default is the sample rate of the source MP4 audio, which is usually 44.1 or 48 kHz. You can explicitly resample to another rate in the Properties tab of the advanced extractor, though resampling always introduces at least some artifacts and is best avoided unless required.
Will the WAV play on my phone?
Yes. Every modern phone supports WAV playback. The main practical concern is file size: a 10 minute WAV is roughly 100 MB, which is a lot of phone storage. If portability is the goal, MP3 or AAC at 192 kbps sounds nearly identical to WAV for casual listening and is 10 times smaller.
Can I use WAV in Adobe Premiere?
Yes. Adobe Premiere, Final Cut Pro, DaVinci Resolve, Avid Media Composer, and every video editor handle WAV as a first-class import. WAV is actually the preferred audio format for video editing workflows because of its lossless nature and universal support.
100% Private: Your Video Never Leaves Your Device
Audio extraction runs locally in your browser using FFmpeg compiled to WebAssembly. Your video file is read from disk into browser memory, decoded, re-encoded to the output format, and the result is saved back to your device. No network request is made during extraction, no data is transmitted, and no server ever sees your footage.
Related Tools and Resources
MP4 to MP3
Compressed output for general playback.
MP4 to AAC
Better compression than MP3 at the same bitrate.
Convert Video to FLAC
Lossless compression, about half the size of WAV.
Convert Video to WAV
Generic video to WAV for any source container.