Will WAV sound better than the M4A?

No. AAC is lossy, so some detail was discarded when the file was first saved, and nothing can restore it. What WAV gives you is no further loss: from here on, every edit and every save keeps exactly what the M4A decoded to. Better is impossible; not-worse is the honest promise.

Why do editors and samplers want WAV at all?

Raw PCM needs no decoder: hardware can stream it from disk, and editors can cut it at any sample without decoding around the cut. Compressed formats decode in frames, which is why some tools refuse them or import them slowly. WAV is the format that requires nothing of the machine reading it.

What sample rate and bit depth comes out?

16-bit at 44.1 kHz — CD audio's own shape, which is what nearly everything downstream expects. Voice memos are recorded at 44.1 or 48 kHz mono; the resample on the way through is inaudible for speech, and the file stays a third smaller than a padded 24-bit export would be.

Does it take M4P files from the old iTunes store?

No. M4P is encrypted, and the decryption never passes through a page like this one. An ordinary M4A — a voice memo, a recorder app's output, an unprotected rip — converts fine.

Is it free, and is my file uploaded?

Free, with no account and no cap on how many files. Each file has a length limit, though: about an hour and a half in Chrome and Edge, and three hours in Firefox and Safari, which cut anything longer at that point. Decoding and rewriting happen in your browser. Your files are never uploaded.

How can I check that my recording is not being uploaded?

Open your browser's developer tools, switch to the Network tab, and convert a file with it open. You will see no request carrying your recording and no model download, because there is no model — the AAC is decoded by the same audio decoder your browser uses to play the file. Then sort that list by size: the largest thing the page sends is a few kilobytes of analytics, nowhere near the size of a voice memo. This page loads analytics and advertising like most websites do, which is why the claim is scoped precisely: your files are never uploaded.

Convert M4A to WAV

An editor timeline, a sampler, a transcription workflow that insists on WAV — and a phone that records everything as M4A. This converts one to the other in your browser, and it is worth saying plainly what the conversion is: a bigger, uncompressed box for the same audio. What the AAC encoder discarded when the phone saved the file does not come back.

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Your recordings
Drop your M4A files here
M4AWAVMP3
Your files are never uploaded.
What you want back
Your files

How to convert M4A to WAV

Add your M4A files

Voice memos, recordings, rips. They are decoded by your browser and never uploaded.
WAV is already selected

16-bit, 44.1 kHz — what editors, samplers and CD audio expect. MP3 is one click away.
Save the WAVs

One by one, or the whole batch as a zip.

What you get

A file the strict software accepts

Editors that will not import M4A, samplers that stream PCM, court and broadcast systems with fixed intake formats — they want WAV, and this hands them WAV without a desktop install or an upload to someone's server.

No second lossy step

Unlike converting to MP3, this adds no compression of its own: the AAC is decoded once and written out as raw samples. For audio headed into an editor, that matters — every later export starts from the cleanest copy this file can give.

Honest about the size and the ceiling

Expect several times the M4A's size, and no gain in quality — WAV preserves exactly what the AAC decodes to, artefacts included. The page says this because tools that imply otherwise are selling disk usage as fidelity.

Voice memos stay private

Recordings of meetings, ideas and interviews are decoded in this page. There is no upload step and no server, so no copy of your recordings exists anywhere else.

Questions about M4A and WAV

Will WAV sound better than the M4A?: No. AAC is lossy, so some detail was discarded when the file was first saved, and nothing can restore it. What WAV gives you is no further loss: from here on, every edit and every save keeps exactly what the M4A decoded to. Better is impossible; not-worse is the honest promise.
Why do editors and samplers want WAV at all?: Raw PCM needs no decoder: hardware can stream it from disk, and editors can cut it at any sample without decoding around the cut. Compressed formats decode in frames, which is why some tools refuse them or import them slowly. WAV is the format that requires nothing of the machine reading it.
What sample rate and bit depth comes out?: 16-bit at 44.1 kHz — CD audio's own shape, which is what nearly everything downstream expects. Voice memos are recorded at 44.1 or 48 kHz mono; the resample on the way through is inaudible for speech, and the file stays a third smaller than a padded 24-bit export would be.
Does it take M4P files from the old iTunes store?: No. M4P is encrypted, and the decryption never passes through a page like this one. An ordinary M4A — a voice memo, a recorder app's output, an unprotected rip — converts fine.
Is it free, and is my file uploaded?: Free, with no account and no cap on how many files. Each file has a length limit, though: about an hour and a half in Chrome and Edge, and three hours in Firefox and Safari, which cut anything longer at that point. Decoding and rewriting happen in your browser. Your files are never uploaded.
How can I check that my recording is not being uploaded?: Open your browser's developer tools, switch to the Network tab, and convert a file with it open. You will see no request carrying your recording and no model download, because there is no model — the AAC is decoded by the same audio decoder your browser uses to play the file. Then sort that list by size: the largest thing the page sends is a few kilobytes of analytics, nowhere near the size of a voice memo. This page loads analytics and advertising like most websites do, which is why the claim is scoped precisely: your files are never uploaded.

Need the words rather than the sound? The transcriber turns recordings into text, on this same no-upload model. Cleaning up a noisy recording first? Remove the background noise. Or see all the audio tools.

Your recordings

What you want back

Your files