AAC to M4A Converter

Put your AAC audio into an M4A file that Apple Music, iTunes, and your iPhone recognise instantly, free and in your browser.

Select AAC file →

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We support most file types including: MP4, MOV, WEBM, AVI, MP3, WAV, PNG, JPEG, GIF, MKV, PDF, FLAC, TIFF!

EchoWave is used by creators, marketers, educators, and businesses to convert and edit media online.

Updated July 2026

AAC is the audio codec, and M4A is the MPEG-4 container that usually holds AAC audio, so this conversion is mostly about packaging. EchoWave wraps your AAC stream into a tidy .m4a file that Apple Music, iTunes, the Music app, and most car systems read as one clean track, with room for a title, artist, album, and cover art. It runs free in your browser with no signup, so you get an Apple-friendly file without installing anything.

Free, no sign-upNo account, no trial

Runs in your browserNothing to install

Works on every devicePhone, tablet, laptop

No watermarkClean output, every time

How it works

How to convert AAC to M4A

1
Upload your AAC
Drag your AAC onto the converter or pick it from your device. Nothing to install.
2
Choose M4A and convert
Select M4A as the output, set the bitrate if it applies, then start. Free, with no sign-up.
3
Download your M4A
Save the finished M4A, or open it in the editor to trim or adjust it first.

Try it

Estimate your M4A

Pick a bitrate and a length to see the M4A file size before you convert.

Bitrate

Length10 min

1 min60 min

Estimated M4A size14MBGreat for most music

An estimate. Real size varies a little with the encoder and the audio itself.

The formats

AAC vs M4A

AAC

Advanced Audio Coding

The lossy codec that succeeded MP3

Type: Lossy audio format
Holds: AAC audio only
Typical size: Small, efficient at low bitrates
Plays on: Phones, browsers, YouTube, and streaming services

Best for:Streaming and mobile audio

M4A

MPEG-4 Audio

Apple-friendly AAC audio

Type: Lossy audio, usually AAC
Holds: AAC audio in an MP4 container
Typical size: Small, smaller than MP3 at the same quality
Plays on: iPhone, Mac, iTunes, and most players

Best for:Apple devices and clean compressed audio

Will it lose quality?

Converting a lossy file to a lossless one cannot restore detail that was already discarded. It only makes a larger file.
Going from a high-quality source to M4A keeps the sound clear while changing the format.
Each pass between two lossy formats loses a little, so always convert from the best source you have.

Use cases

What people use it for

Music librariesStandardise your collection

ListenersUse a format your player likes

PodcastersMatch your host requirements

EditorsImport audio your tool accepts

DevicesPlay on phones and car stereos

Troubleshooting

If something looks off

The M4A is larger than I expected

Lossless and uncompressed formats are big by design. If you want a smaller file, pick a lossy format and a bitrate around 192 to 256 kbps.

The song details are missing

Title, artist, and album travel as tags when the source has them. If they are blank, add them in any music app after converting.

My app will not open the M4A

Most apps open common audio, but a few are picky. VLC plays almost anything, or convert to MP3 for the widest support.

FAQ

AAC to M4A questions

What is the difference between AAC and M4A?

AAC is the codec that compresses the sound. M4A is the MPEG-4 container file that holds AAC audio plus tags like title, artist, album, and cover art. Most .m4a files you meet are simply AAC audio in an M4A wrapper, which is why this conversion is mostly about the container rather than the sound.

Is the AAC to M4A converter free?

Yes. EchoWave converts AAC to M4A with no signup, no file-count limit, no trial, and no watermark. Upload your AAC file, convert it, and download the M4A from your browser.

Will converting AAC to M4A lose quality?

Because M4A normally carries the same AAC audio, the sound stays clean and there is no useful quality to lose by changing the wrapper. A higher bitrate cannot add detail the AAC file never had, so the M4A is as good as the source you started with.

Why would I convert AAC to M4A?

Some apps and music libraries expect the .m4a extension rather than a bare .aac file, and M4A gives you a tidy slot for artwork, track names, and chapters. It is the natural choice when you are loading audio into Apple Music or the iTunes library and want it to file itself correctly.

Can I play the M4A on iPhone and Mac?

Yes. M4A is the everyday audio file across iPhone, iPad, Mac, Apple Music, and iTunes, so it plays without any extra setup. It also opens in VLC, foobar2000, Android, and most modern car stereos.

Does the M4A keep my song title and artwork?

M4A is built to carry that information, so a title, artist, album, and cover art travel with the file when your AAC already includes them. If any field is blank, you can fill it in afterward in Apple Music or any tag editor.

Does it work on Windows and Android too?

Yes. The converter runs in any browser on Windows, macOS, Chromebook, Linux, iPhone, and Android. On older Windows Media Player you may need a codec pack to play M4A, but VLC opens it everywhere with nothing to install.

Can I convert several AAC files?

Yes. There are no file-count limits on these pages, so you can convert your AAC tracks one after another. Larger files simply take a little longer to upload and convert.