mp4
MPEG-4 Part 14
The default container for web and mobile video. Pairs H.264 or H.265 video with AAC audio and plays essentially everywhere.
Convert MP4 to CAF
Free, no account, no watermark. Converted on our servers, then deleted.
Drop an MP4 file here
As many as you like. We will show you what they convert to.
How to convert MP4 to CAF
- 1
Choose your file
Drop an MP4 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.
MP4 to CAF, asked and answered
Does converting MP4 to CAF lose quality?
Nothing further is lost, but nothing is recovered either. CAF stores exactly what the MP4 contains, compression artefacts included, and the file is usually several times larger for no visible gain.
Can I convert the CAF back to MP4?
No. CAF keeps the sound and throws the picture away, so there is nothing left to put back into an MP4.
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.