Turn MP3 audio files into CAF. It is converted in your browser, so the file never leaves your device.
Drop MP3 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 MP3 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 CAF, or download everything as one ZIP if you converted several files.
The MP3 to CAF 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.
MP3 is lossy, so editing or re-saving it repeatedly degrades the sound. CAF is what Apple's audio tools and iOS apps use. MP3 is at home in music and podcasts that must play anywhere; CAF is the usual choice for audio inside Apple's apps and development tools.
The defaults suit most files. Under Options you can trim the start and end.
This pair uses the compatibility engine, ffmpeg built for the browser, because CAF cannot be written by the browser's built-in codecs. It is a one-off download of about 10 MB that the browser keeps, it is slower than the built-in codecs, and it takes files up to 1 GB.
MP3 is the audio format everything plays. It shrinks audio to roughly a tenth of its uncompressed size by discarding sound most listeners cannot hear. Newer codecs are more efficient, but nothing matches its compatibility.
Opens in Every phone, computer, car stereo and speaker
MP3 converterCAF is a flexible audio container that Apple introduced with Mac OS X Tiger. It can hold almost any codec and has no practical file size limit, unlike WAV or AIFF. It is common in Apple's developer tools and in apps built on Core Audio.
Opens in macOS and iOS apps such as GarageBand, Logic and QuickTime; fewer players elsewhere
CAF converter| MP3MP3 audio | CAFCore Audio Format | |
|---|---|---|
| Stands for | MPEG-1 Audio Layer III | Core Audio Format |
| Type | Audio | Audio |
| Compression | Lossy | Depends on what is inside |
| Introduced | 1993, by the Fraunhofer Society and the Moving Picture Experts Group | 2005, by Apple |
| Opens in | Every phone, computer, car stereo and speaker | macOS and iOS apps such as GarageBand, Logic and QuickTime; fewer players elsewhere |
| Best for | Music and podcasts that must play anywhere | Audio inside Apple's apps and development tools |
| File extension | .mp3 | .caf |
No. The MP3 to CAF conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
It depends on the file. ToAny keeps as much of the original as CAF can hold.
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 MP3 file, press Convert and save the CAF. There is nothing to install.
Yes. MP3 to CAF runs on the compatibility engine, which takes files up to 1 GB, and a long clip takes a while because it is slower than the browser's built-in codecs. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.