M4A Converter

Convert M4A files to MP3, WAV, FLAC and more in your browser — nothing is uploaded.

MP3, WAV, FLAC, M4A, M4B, MP4, AAC, OGA or WEBA, one or many. Drop them here or paste with ⌘V / Ctrl+V. Choose what each becomes on its row.

Runs on your device. Files are read and converted in your browser and aren't uploaded.

M4A

Lossy
Apple's format
Keeps chapters

AAC audio in an MP4 container — the format of iTunes and Apple Music purchases, iPhone voice memos and many recorders. It sounds a little better than an MP3 of the same size, and plays on Apple devices, Android, Windows and in browsers.

Learn more about M4A files

An M4A is lossy. Into WAV and FLAC its sound is kept exactly as it is now, in a bigger file (it can't get back what was lost); into another lossy format it's encoded again, so choose a bitrate at least as high as the original's.

Into MP4, M4B and AAC its AAC sound is copied as is when it can be — no re-encoding, no quality lost, and no encoder needed, so it works in Firefox too.
Its chapters are kept when it becomes an M4B or M4A; every other format drops them.
M4A files can be up to 2 GB.
Making M4A, MP4, M4B or AAC needs the browser's AAC encoder (Chrome, Edge and Safari — not Firefox yet); OGA and WEBA its Opus encoder; MP3, WAV and FLAC are made in any modern browser.

How to do it

Choose your M4A files, or drop them on the page — as many as you like.
Each starts as an MP3; pick another format for every file with Convert to in Settings, or for one file on its row.
Convert all, then download each file, or all of them in one .zip.