Turn AAC audio files into M4A. It is converted in your browser, so the file never leaves your device.
Drop AAC files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · other file types work too0 bytes uploaded, ever
Drop AAC files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
Press Convert. Open Options first if you want to change the defaults. The work happens in this tab.
Save the M4A, or download everything as one ZIP if you converted several files.
The AAC to M4A converter is part of this page and runs inside your browser. Your audio files are never sent to ToAny or to anyone else.
Nothing has to travel to a server and back, so the conversion starts the moment you press Convert, even on a slow connection.
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
A raw AAC file has no container, so some players cannot seek in it or read its tags. M4A sounds better than MP3 at the same file size and is native to Apple devices. AAC is at home in efficient audio for streaming and video soundtracks; M4A is the usual choice for music and voice memos on Apple devices. Both formats are lossy, so the content is compressed a second time; start from the best copy you have.
The defaults suit most files. Under Options you can choose the bitrate and trim the start and end.
The conversion uses your browser's own video and audio codecs (WebCodecs), with hardware acceleration where the device has it; the file is read from disk as it goes and can be up to 2 GB. Where the browser lacks a codec, the page falls back to the compatibility engine. M4A is written at 192 kbps unless you choose another bitrate.
AAC was designed as the successor to MP3 and is the audio codec inside most MP4 videos and streaming services. A bare .aac file is the raw stream without a container, which some players handle poorly.
Opens in Most phones, browsers and media players
AAC converterM4A is an MP4 file that contains only audio, usually AAC. iPhone Voice Memos and the iTunes Store use it. It sounds better than MP3 at the same size but is not accepted everywhere MP3 is.
Opens in Apple devices, Android, current browsers; some car stereos and older players do not
M4A converter| AACAAC audio | M4AM4A audio | |
|---|---|---|
| Stands for | Advanced Audio Coding | MPEG-4 Audio |
| Type | Audio | Audio |
| Compression | Lossy | Lossy (AAC); lossless when it holds ALAC |
| Introduced | 1997, by the Moving Picture Experts Group | The early 2000s, by the Moving Picture Experts Group (popularised by Apple) |
| Opens in | Most phones, browsers and media players | Apple devices, Android, current browsers; some car stereos and older players do not |
| Best for | Efficient audio for streaming and video soundtracks | Music and voice memos on Apple devices |
| File extension | .aac, .adts | .m4a |
No. The AAC to M4A conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
M4A is a lossy format, so a small amount of detail is traded for a smaller file. At the default setting the difference is hard to notice. You can choose the bitrate under Options.
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the AAC file, press Convert and save the M4A. There is nothing to install.
Yes. Files up to 2 GB are accepted. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.