Convert M4A to WAV online
Convert a M4A file to WAV directly in your browser — the file is never uploaded to a server.
or click to select it
Convert an M4A file into an uncompressed WAV file by decoding the AAC audio inside it, for editors and hardware that need WAV instead of AAC.
M4A is a container that almost always holds AAC-encoded audio. The tool decodes that AAC stream into raw PCM samples and writes them into a WAV file, so anything that can't decode AAC — but can read WAV — can open the audio without issue.
Use cases
- Import audio recorded as M4A into a DAW that expects uncompressed WAV tracks.
- Play an M4A voice memo or recording on hardware with no AAC decoder.
- Prepare an M4A file for software that only imports WAV.
How it works
- 1
Upload your M4A file
Drop the file in or select it from your device.
- 2
Click Convert
ffmpeg.wasm decodes the AAC audio and writes it out as PCM WAV directly in your browser.
- 3
Download the WAV
Once it's done, download the resulting file.
Technical details
Runs ffmpeg.wasm in your browser. Many DAWs, older audio editors and some embedded or broadcast systems have no AAC decoder built in but handle uncompressed PCM WAV natively, so this conversion is really about codec support, not quality: it doesn't add detail beyond what the original AAC encoding kept, it just puts it in a format more software can read.
Frequently asked questions
Does this restore any quality lost when the AAC audio was first encoded?
No. It decodes the existing AAC audio into an uncompressed format; whatever detail AAC encoding removed originally is not recovered.
Is there a file size limit?
Audio files up to 300 MB work reliably on most devices.