M4A to WAV — Free Offline Audio Converter

Why convert M4A to WAV?

Anything that has to be analysed, transcribed, sampled or precisely edited wants uncompressed audio. Decoding an M4A — a voice memo, an interview, an Apple Music export — to WAV gives editors exactly the PCM stream they expect.

M4A is an MP4 container carrying AAC (or ALAC) audio — what Apple Music, Voice Memos and most modern recorders produce. At the same bitrate it beats MP3 on quality.

When M4A → WAV is the right move

Editing iPhone Voice Memos in a DAW or audio editor.
Feeding recordings to transcription or speech-analysis tools.
Preparing audio for mastering or CD authoring.

Quality, size and what changes

The AAC stream is decoded to raw PCM, so the WAV sounds exactly like the M4A played back. It cannot restore detail AAC discarded, and the file grows roughly tenfold because WAV stores uncompressed samples.

What you gain with WAV: Bit-perfect, uncompressed audio that every editor and transcription engine can read.

How it works

Drop your M4A file above and Morphio decodes it locally, then re-encodes it as WAV using WebAssembly + the browser's native codecs. Nothing is ever uploaded — your files stay on your device. Batch as many files as your machine can handle. See exactly how in-browser conversion works.

M4A to WAV — frequently asked questions

How do I convert M4A to WAV without uploading the file?

Open the M4A to WAV page, drop your audio file on the drop zone and press convert. Morphio runs an FFmpeg build compiled to WebAssembly that runs inside the page, so the M4A data never leaves your device and no server ever receives a copy.

Does converting M4A to WAV lose quality?

Sample rate and channel layout carry across, and you keep the original file untouched on disk. Converting M4A to WAV only rewrites the container and encoding you asked for — the source file on your disk is never modified.

Is the M4A to WAV converter free, and how big can the file be?

Yes. The free plan covers 10 conversions a day with files up to 200 MB and adds no watermark or sign-up. Morphio Pro ($5/month, or $29 once for lifetime access) removes the daily cap and raises the per-file limit to 5 GB.

Can I edit iPhone voice memos this way?

Yes — decode the M4A to WAV and every editor and transcription tool will accept it.

Does quality improve?

No, but nothing further is lost either: WAV freezes the audio exactly as it decodes.

M4A to WAV Converter

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