aac
Advanced Audio Coding
The MP3 successor: better quality at the same bitrate, and the default audio inside MP4.
Convert AAC to CAF
Free, no account, no watermark. Converted on our servers, then deleted.
Drop an AAC file here
As many as you like. We will show you what they convert to.
How to convert AAC to CAF
- 1
Choose your file
Drop an AAC file onto the converter, or pick one from your device. You can add several at once.
- 2
Select CAF
Pick CAF as the output format. Open Settings if you want to control the audio codec, the audio bitrate, and the sample rate, and 2 more.
- 3
Download the result
Convert and download the finished file. No account, and nothing to install.
caf
Core Audio Format
Apple's container for uncompressed audio, written by Logic and GarageBand. Unlike WAV it has no four gigabyte ceiling, which is why long recordings end up in it.
AAC to CAF, asked and answered
Does converting AAC to CAF lose quality?
Nothing further is lost, but nothing is recovered either. CAF stores exactly what the AAC contains, compression artefacts included, and the file is usually several times larger for no visible gain.
Can I convert the CAF back to AAC?
Yes, and the file will open — but a round trip is not free. Each pass re-encodes, so going AAC to CAF and back leaves you with less than you started with.
What can I change about the CAF it produces?
You can set the audio codec, the sample rate, mono or stereo, and where it starts and stops. Anything left on Auto is decided by the encoder, which is usually the right answer unless you are targeting a specific size or device.
Where does the conversion happen?
On our server. The file is sent over HTTPS and converted in a sandbox with no network access of its own; your input and the result go together, removed at once if it fails and otherwise kept for a few minutes so you can download them, then deleted — whether or not you did. There are no accounts for anything to be kept against.
Is there a limit on file size?
Yes — there is a per-file cap and an hourly job limit, because this runs on one small server. The API page states the limits currently in force rather than a number baked into this page.