Convert M4A to WAV
How do you convert M4A to WAV? Drop the .m4a file into the box on this page and hit Convert to WAV, and the decoded PCM downloads moments later. All of it happens through a WebAssembly ffmpeg build inside your browser, so the file is never uploaded to decode.
Runs in your browser. Your file never leaves your device.Drop your M4A hereChoose a M4A to convert
It becomes a WAV right in your browser, up to 200 MB
Your file never leaves your device
Works in airplane mode. See the proof
Limits, published exactly
| Where it runs | In your browser. The file never leaves your device. |
|---|---|
| Free conversions | Unlimited. No account, no ads, no queue, no watermark. |
| Max file size, free | 200 MB |
Why convert M4A to WAV?
The trigger is almost always a DAW or editor that wants raw PCM in. Voice memos, iTunes downloads and most Apple-ecosystem recordings arrive as M4A, and a fair amount of audio software, transcription tooling and older gear would rather have an uncompressed WAV to work from than a compressed container it has to decode on the fly. Converting gives those tools clean PCM input they can scrub, slice and process without fighting the codec. It is the standard prep step before importing an iPhone recording into a serious audio workflow.
What is M4A?
M4A is audio in an MPEG-4 container, almost always AAC-encoded: the format Apple uses for iPhone voice memos, iTunes purchases and most recordings made in the Apple ecosystem. AAC compresses slightly better than MP3 at the same bitrate, and playback support is broad on modern devices. The friction appears at the edges: older car stereos, cheap players, some Windows software and many upload forms still only accept MP3.
What is WAV?
WAV is uncompressed audio in its plainest form: the 1991 RIFF container holding raw PCM samples, the same data a CD carries. Nothing is lost and nothing is guessed, which makes WAV the standard handoff format for audio editing, mastering, transcription tools and samplers. The price is size: about 10MB per stereo minute, an order of magnitude more than a decent MP3 of the same sound.
Quality and what to expect
Be clear-eyed here: M4A holds AAC, which is a lossy format, so some detail was already discarded when the file was first encoded. Decoding to WAV adds no new loss, but it cannot restore anything AAC threw away, so the WAV is not better-than-source or true studio quality; it is a faithful uncompressed copy of an already-lossy signal. The file also gets much larger, since uncompressed PCM is far heavier than compressed AAC, frequently several times the M4A size. Sample rate and channels carry through unchanged. In short: cleaner to edit, not higher fidelity than the M4A.
M4A to WAV FAQ
Does converting M4A to WAV make it lossless quality?
No. The M4A already used lossy AAC compression, and that lost detail is gone for good. The WAV is a faithful uncompressed copy of the audio as it currently sounds, not a restoration of original studio quality.
Why bother if no quality is gained?
Because many DAWs, samplers and transcription tools prefer raw PCM input. The WAV is easier for that software to scrub and process than a compressed M4A, even though it holds the same already-lossy audio underneath.
Why is the WAV file so much larger?
AAC compresses the audio heavily, and WAV stores it uncompressed, so the same recording takes far more space as PCM. A WAV several times the size of the source M4A is completely expected for this conversion.
Is my M4A recording sent off to be processed?
It stays put. The decoder is ffmpeg compiled to WebAssembly running in a worker in this tab, so your recording never leaves the device. That matters when the M4A is a private voice memo or meeting capture.