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M4A to WAV Converter

Turn M4A files into WAV in a couple of clicks. M4A is an MP4 container holding AAC or ALAC audio; WAV is uncompressed PCM audio. The conversion is lossless — every pixel, sample or byte in the source is preserved.

Not uploaded to any serverConverted on this deviceGone when you close the tabHow this works

Drop your files here

M4A files (.m4a, .m4b) · up to 300 MB each

or paste files from your clipboard

Ready when you are

Drop a M4A file above and FileTools360 will turn it into WAV — right here on your device, without uploading anything.

⌘K to search converters

How to use it

  1. 1

    Add your M4A files

    Drag them onto the drop area, choose them from your device, or paste them from your clipboard. You can queue several at once. Nothing is sent anywhere — the file stays on this device.

  2. 2

    Adjust the settings if you want to

    The defaults suit most people. Open Advanced to control bitrate, sample rate and channels.

  3. 3

    Convert and download

    Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

Privacy, in plain words

Is it safe? Your M4A file is not uploaded anywhere

What “uploaded” normally means. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website. That copy is what the word “upload” means, and it is the part nobody explains.

What happens instead. This site does not do it. There is no server here that receives files, so your M4A file is read, converted and handed back by the browser you are using right now. It never travels — so there is no copy to store, read, leak or hand over.

Check it yourself in ten seconds

Turn off your Wi-Fi after this page has loaded, then convert a file anyway. It still works, because everything needed is already on your device.

The longer explanation of how this works, and the full detail of what is and is not stored on the privacy page.

Why this matters more than it sounds

An audio file is a conversation. Transcribed by machine — which is cheap now — it becomes searchable text about whoever was speaking. It matters more than it sounds, because of what audio files usually are:

Call recordings

both sides of a conversation, often legally sensitive

Interviews

a source's voice is identifying even when the name is not said

Voice notes and dictation

thinking out loud, never meant for an audience

Therapy and consultation recordings

clinical material with strict handling rules

A file that is never sent cannot be kept, leaked, subpoenaed or used to train anything. That is a property of how this works, not a promise about how carefully it is run.

M4A and WAV explained

M4A is an MP4 container holding only audio — usually AAC, sometimes Apple Lossless. The extension exists mainly so players know not to look for a video track.

WAV stores uncompressed PCM audio — the raw samples, exactly as captured. A stereo CD-quality minute is roughly 10 MB, which is the price of having no compression whatsoever.

Where M4A files come from
iTunes purchases, Apple Music downloads, voice memos and audiobooks.
Where WAV is used
Recording sessions, sample libraries and audio editing.

M4A vs WAV

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

M4A compared with WAV
PropertySourceTarget
CompressionLossy or losslessUncompressed
Introduced20011991
Browser supportVery good, especially on Apple platforms.Universal.
M4A is stronger at
Excellent quality per byte. Proper chapter support, which is why audiobooks use it. Strong metadata and artwork handling.
WAV is stronger at
Perfect fidelity with zero compression artefacts. No decoding overhead, so editors scrub instantly. Universally supported.

Why convert M4A to WAV?

People make this switch when they run into the limits of M4A: you need certainty that any device will play it. WAV is the better fit when recording, editing, mastering, or handing audio to another tool.

Be aware of the size trade-off: WAV is uncompressed, so expect the converted file to be considerably larger than the M4A you started with.

M4A limitations that prompt the switch
Less universal than MP3 on older or cheaper hardware. The extension hides what codec is actually inside.
What you give up
Very large files. No standard metadata support worth relying on.

Does converting M4A to WAV reduce quality?

Both formats store the content without discarding data, so this conversion preserves it exactly. The file size may change because the two formats compress differently, but the content itself is unaffected.

Measured, not estimated

What converting M4A to WAV actually costs

On every sample measured, the WAV came out larger — 5.5× larger at best and 5.6× larger at worst.

Each row is one sample chosen to isolate a property these formats treat differently.
SampleM4A inWAV outChange
An easy clipThe compressible end of the range — a clean tone, or a moving test pattern — where a codec does its best work.31.1 KB174 KB5.6×
A hard clipThe other end — pink noise, or dense video grain. Close to incompressible by design, and the worst case for every codec.31.9 KB174 KB5.5×

Produced by this site's own converter. The same code that runs in your browser, at the same default settings, so these are the bytes you would download.

Samples are generated from a fixed seed rather than taken from real photographs or documents, so the corpus is reproducible and carries no licensing question — and so the numbers predict the shape of your result rather than its exact size. Measured 2026-10-01. The method, and the command that regenerates every figure on this page, are on the how it works page.

About these formats

Source

MPEG-4 Audio

MP4 container holding AAC or ALAC audio.

Extensions
.m4a, .m4b
MIME type
audio/mp4
Best for
iTunes and Apple Music · Audiobooks · Podcasts
Compatibility
Very good, especially on Apple platforms.

Target

Waveform Audio

Uncompressed PCM audio. Perfect quality, big files.

Extensions
.wav, .wave
MIME type
audio/wav
Best for
Editing and mastering · Sound design · Archival
Compatibility
Universal.

The output is a lossless container, but the audio inside it was already compressed. You get a bigger file, not better sound.

Good to know

M4A to WAV Converter — questions

How do I convert M4A to WAV?

Drop your M4A file onto the area above, then press Convert. The WAV file saves straight to your device. You do not need an account, and there is no watermark.

Is it safe to convert M4A files here — are they uploaded to a server?

No, nothing is uploaded. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website; it is converted there and sent back. That copy is what "upload" means, and it is the part that puts your file out of your control. This site does not do it. Your M4A file is read and converted by the browser you are using right now and never leaves this device, so there is no copy for anyone to store, read or hand over. You can prove it: turn off your Wi-Fi after this page loads and the conversion still works.

Can I convert confidential M4A files, like bank statements or contracts?

Yes, and that is the case this site was built for. Because the file never leaves your device, a confidential document is no more exposed than it is sitting in your own folder — there is no transfer, no copy on someone else's hardware, no retention period to read about and no staff with access. Nothing is logged about the file either: not its name, not its size, not its contents. The one thing worth saying plainly is that this protects the file in transit and at rest on our side, not from anything already on your own computer.

What should I know before converting M4A to WAV?

The output is a lossless container, but the audio inside it was already compressed. You get a bigger file, not better sound.

Does converting to WAV reduce quality?

No. WAV is a lossless format, so the conversion preserves exactly what is in your M4A file. Note that it cannot recover detail that was already discarded when the M4A was first created — a lossless container does not undo earlier compression.

How large a file can I convert?

Up to 300 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android. Pick the file from wherever your phone stores it — Files on iOS, or your downloads folder on Android. Long recordings may run out of memory on an older phone.

Related converters

All audio converters
WAV → M4A
M4A → AAC
M4A → AIFF
M4A → FLAC
M4A → MP3
M4A → OGG
M4A → Opus
MP4 → WAV

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FileTools360 by the numbers

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