Audio conversion
Convert M4A to AAC
Updated Jul 2026
Most M4A files already contain AAC audio inside Apple's M4A container, so converting to AAC usually just means unwrapping it, not re-compressing the sound. Open the file in a converter, choose AAC as the output, and convert. Doing this on your own computer keeps voice memos and personal recordings off someone else's server.
- Extension
- .m4a
- Type
- Audio
- Typically
- iTunes / voice memos
- Compression
- Lossy
- Extension
- .aac
- Type
- Audio
- Typically
- Apple / streaming audio
- Compression
- Lossy
Convert M4A to AAC on your own computer. Nothing uploads.
How to convert M4A to AAC
- Open Morphjet and drag in the M4A files you want to convert, whether it's a voice memo, a song, or a whole folder.
- Choose AAC as the output format.
- Convert. The AAC files are written next to your originals, and nothing leaves your machine.
M4A vs AAC: what actually changes
| M4A | AAC | |
|---|---|---|
| Underlying audio codec | Almost always AAC audio already, wrapped in an M4A container | The same AAC codec, without the container wrapper |
| File size | Same as the AAC audio it holds, plus a small container overhead | Essentially identical, just missing that container overhead |
| Compatibility | Well supported on Apple devices and most media apps | Recognized by streaming platforms, Android, and software that expects a plain AAC stream |
| Metadata, artwork, chapters | Can carry title, artist, cover art, chapters, and playback bookmarks | Basic tags only, no chapters or bookmarks |
| Typical source | Voice memos, iTunes purchases, podcast downloads | Rare as a native source, more often a conversion target for apps that need a bare AAC file |
When to convert, and when not to
Convert M4A to AAC when an app, embedded player, or older Android device expects a plain AAC stream instead of an M4A container, or when a program specifically rejects the .m4a extension.
Keep the M4A original if you rely on its cover art, chapters, or Voice Memos bookmark, since a plain AAC file usually cannot hold any of that.
Why not just use an online converter?
M4A files are often voice memos or personal recordings, not something you want sitting on a stranger's server while it converts. Since the audio inside is usually already AAC, an online converter does not even need to re-encode anything, it just unwraps the container, which makes uploading it even more pointless. Converting on your own computer keeps the recording private and skips the upload entirely.
Questions
Does converting M4A to AAC lose quality?
Usually no. Most M4A files already contain AAC-encoded audio, so converting mostly removes the container rather than re-compressing the sound. The exception is a M4A holding Apple's lossless ALAC audio, which does lose some quality when compressed down to AAC.
Why would I need a plain AAC file instead of M4A?
Some apps, embedded devices, and older Android software expect a bare .aac file and don't handle the M4A container well, even though the audio format inside is the same.
Will I lose cover art or chapters?
Yes, mostly. M4A can store cover art, chapters, and the bookmark that Voice Memos uses to resume playback, but a plain AAC file typically can't hold any of that, so it gets dropped in conversion.
Can I convert M4A to AAC without uploading the file?
Yes. A desktop converter does the work locally, which matters especially for voice memos and personal recordings, since the audio never leaves your device.
Morphjet converts M4A, AAC, and 1,800+ other formats, all on your machine. Launching this July.