Audio conversion
Convert AAC to M4A
Updated Jul 2026
AAC files hold compressed audio, but the raw .aac file often lacks a container for tags like artist and album art, and many media apps expect the M4A wrapper instead. Converting AAC to M4A just repackages that audio, and you can do it on your own computer without uploading the file anywhere.
- Extension
- .aac
- Type
- Audio
- Typically
- Apple / streaming audio
- Compression
- Lossy
- Extension
- .m4a
- Type
- Audio
- Typically
- iTunes / voice memos
- Compression
- Lossy
Convert AAC to M4A on your own computer. Nothing uploads.
How to convert AAC to M4A
- Open Morphjet and drag in the AAC file, or a whole folder of them, to convert in one go.
- Choose M4A as the output format.
- Convert. The M4A files are written next to your originals, and nothing leaves your machine.
AAC vs M4A: what actually changes
| AAC | M4A | |
|---|---|---|
| File size | Small, already compressed | Same size, just rewrapped in a new container |
| Quality | Lossy, quality was set when it was originally encoded | Same audio data, no extra loss from the wrap itself |
| Opens everywhere | Plays in most media apps, but a bare .aac stream can trip up some players and phones | Recognized by Apple's media apps and most phones without confusion |
| Metadata (song info, cover art) | Limited, bare AAC streams often carry no tags | Yes, the M4A container supports artist, album, and artwork tags |
| Common use | Streaming downloads, voice recordings, some Android audio | Music downloads and voice memos on Apple devices |
When to convert, and when not to
Convert AAC to M4A when you want proper song tags and cover art to show up correctly, or when an app flatly expects an M4A file instead of a bare AAC stream.
Keep the AAC file if it already plays fine in whatever you're using, since M4A won't improve the audio quality, only give it a friendlier container.
Why not just use an online converter?
Voice memos and personal recordings are often the reason people convert AAC files, and those aren't recordings you want sitting on someone else's server. An online converter uploads the audio to be processed elsewhere. Converting on your own computer keeps the recording, and whatever's in it, entirely on your machine.
Questions
Does converting AAC to M4A lose quality?
Not really. M4A is a container that can hold AAC audio directly, so converting mostly means repackaging the same compressed audio data rather than re-encoding it. Any quality loss happened when the AAC was first created, not during this step.
Why won't my AAC file show tags or play properly everywhere?
A bare .aac file is just the raw audio stream with no proper container, so many apps can't read metadata like artist or album art from it. Wrapping it as M4A gives it a proper container that Apple's media apps and most phones can read correctly.
Is M4A the same thing as AAC?
Not exactly. AAC is the audio encoding, while M4A is a container format, a bit like how a folder holds files inside it. Most M4A files actually hold AAC encoded audio, so converting between them is mostly about the wrapper, not the sound itself.
Can I convert AAC to M4A without uploading the file?
Yes. A desktop app like Morphjet does this on your own computer, so the audio never travels over the internet. Your wifi doesn't even need to be on.
Will the M4A keep my song info and cover art?
If the original AAC file already had tags embedded, yes, they carry straight over. If it was a bare AAC stream with no metadata, there's nothing to carry over, and you'd need to add it afterward.
Morphjet converts AAC, M4A, and 1,800+ other formats, all on your machine. Launching this July.