What is the difference between M4A and WAV?

M4A is an MPEG-4 container carrying AAC audio. It is Apple's standard format for music and voice memos, and delivers noticeably better quality than MP3 at the same bitrate, especially below 160kbps. WAV stores uncompressed PCM audio — the raw samples, with nothing discarded. Quality is perfect and files are large: roughly 10MB per stereo minute at CD quality. It is the standard working format for recording and editing.

Will I lose anything converting M4A to WAV?

Nothing further is lost, but nothing is recovered either. M4A already discarded detail when it was first encoded, and that is gone for good. Converting to WAV preserves exactly what remains, in a much larger file.

Anything to watch out for with WAV?

WAV has no standard tagging scheme, so artist and album metadata often does not survive a conversion into it. The 4GB file-size ceiling comes from the 32-bit size field in the RIFF header; very long recordings need RF64 or a different container.

What bitrate should I use?

For music, 192kbps MP3 or 128kbps Opus is the point where most people stop hearing a difference from the source. For speech and podcasts you can go much lower — 96kbps MP3 or 64kbps Opus is transparent for voice. Going above 256kbps on a lossy codec mostly just makes the file bigger.

What should I know about starting from M4A?

M4A is the container; AAC is the codec inside it. The same container with a .m4b extension is used for audiobooks with chapter markers. More broadly: M4A is an MPEG-4 container holding AAC audio — the format Apple standardised on for iTunes, Apple Music and voice memos. AAC is a genuine improvement on MP3: at the same bitrate it holds up better, particularly at lower rates and on cymbals and applause where MP3 struggles.

When is WAV the right choice?

WAV suits: recording and editing, where repeated saves must not degrade quality; mastering sources and archival; short samples where size is irrelevant. It is the wrong choice when sharing, streaming or storing large libraries.

Is there a file size limit?

No hard limit — the constraint is your browser's memory. Files under 50MB convert in a few seconds. Larger files work but take longer, and a browser tab typically has 250-500MB to play with, so very large batches are better split into smaller groups.

Does this work on mobile?

Yes. The drop zone falls back to your phone's file picker, and the conversion runs on-device exactly as it does on desktop. Large files are slower on a phone because there is less CPU and memory available, but nothing about the workflow changes.

Convert M4A (AAC) to WAV

Convert M4A to uncompressed WAV for editing, sampling or any tool that needs raw PCM. Free, in your browser, no upload.

Drop audio files to convert

WAV, MP3, M4A (AAC), AAC, OGG, Opus, FLAC

Files stay on your device. Open DevTools' Network tab to verify.

MP3/AAC/Opus and decoding compressed input use browser WebCodecs; available in modern browsers only.

Overview

Why convert M4A (AAC) to WAV

This does not restore quality. M4A already discarded detail permanently, and WAV will faithfully preserve whatever is left — at a much larger file size. Convert this direction only when a tool downstream requires WAV specifically.

Comparison

M4A (AAC) vs WAV: what actually differs

M4A (AAC) compared with WAV across encoding, fidelity, file size and support.
Attribute	M4A (AAC)	WAV
Full name	MPEG-4 Audio (AAC)	Waveform Audio File Format
Encoding	Binary	Binary
Fidelity	Lossy — more efficient than MP3 at equivalent bitrates	Lossless — bit-for-bit original samples
Typical size	Roughly 20-30% smaller than MP3 at perceptually equal quality	Very large — about 10MB per stereo minute at 44.1kHz/16-bit
Support	Every Apple device, Android, modern browsers, most car systems.	Universal. Every operating system, editor and player reads WAV.

How to

How to convert M4A (AAC) to WAV

01
Drop your M4A file
Drag one or more M4A files onto the drop zone above, or click to browse. Files stay on your device — there is no upload step.
02
Convert to WAV
convert.now parses the M4A and writes it out as WAV in a Web Worker, so the page stays responsive even on large files. Nothing is sent anywhere.
03
Download the result
Download the WAV file, or a zip of all of them for a batch. Filenames are preserved, with the extension changed to .wav.

Why here

Why convert.now

Private
Files stay in your browser. No upload step. Nothing for anyone to see.
Fast
No queue, no upload wait. Conversion starts the moment you drop a file.
Free
No ads. No file-count limit. No sign-up wall. Just the converter.

FAQ

M4A (AAC) to WAV: common questions

No. The M4A to WAV conversion runs entirely in your browser. Files never leave your device, and there is no server involved in the conversion at all. Open DevTools' Network tab and run a conversion if you want to confirm it — you will see the page and its code load, and no request carrying your file.

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Last updated 27 August 2026

Why convert M4A (AAC) to WAV

M4A (AAC) vs WAV: what actually differs

How to convert M4A (AAC) to WAV

Drop your M4A file

Convert to WAV

Download the result

Why convert.now

M4A (AAC) to WAV: common questions

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