Convert M4A to WAV

WAV is uncompressed PCM, so it is the clean, editable master that editing software and mastering tools expect. It is a larger file, but there is no further quality loss the way there is when re-encoding to another compressed format.

No. The conversion runs with WebCodecs on your device, so the audio never leaves the browser — no account, no quota, no size limit. Chrome, Edge and Firefox work best.

No — and it is worth being clear about this. If your M4A is compressed AAC, decoding it to WAV gives you an exact, uncompressed copy of that audio, but it cannot restore detail the AAC compression already discarded. WAV is the right format when a tool needs uncompressed PCM to work from, not a way to upgrade a lossy file. What you get is clean and editable, at the quality the M4A already had.

Because editors, DAWs, samplers and some transcription pipelines work most reliably from uncompressed PCM. They can decode the WAV instantly without a codec, scrub and edit it without re-compressing, and avoid the small artifacts of repeatedly saving a lossy format. If you are just listening, keep the M4A; if the file is going into a tool that processes the audio, WAV is the safer input.

It matches what the M4A decodes to — commonly 44.1 or 48 kHz, at a standard bit depth — with no resampling. The tool decodes the AAC and writes those samples straight into a WAV wrapper, so the result lines up with the original recording rate rather than being converted to some other spec that a later tool might not expect.