Convert Core Audio Format (.caf) to MPEG-4 Audio (.m4a) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .caf file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .m4a file when it's ready.
CAF (Core Audio Format) is Apple's professional audio container supporting any codec and unlimited file sizes, native to Logic Pro and macOS Core Audio. M4A (MPEG-4 Audio) is Apple's consumer audio container, the standard format for iTunes, Apple Music, iPhone, and the entire Apple device ecosystem. Both are Apple formats, but M4A has vastly wider device support.
Converting CAF to M4A repackages the audio from the professional container into the consumer-friendly format. If the CAF contains AAC or ALAC, the audio stream can often be copied directly without re-encoding.
CAF files are limited to macOS Core Audio applications — they cannot be played on iPhone, iPad, Windows, or Android. M4A plays natively on every Apple device and most non-Apple devices. Converting CAF to M4A is the standard export step when preparing professional recordings for consumer distribution.
M4A supports both AAC (lossy) and ALAC (lossless) codecs, rich metadata (album art, lyrics, chapters), and iTunes/Apple Music integration. It is the bridge between professional macOS production and universal Apple ecosystem consumption.
FFmpeg reads the CAF container and either copies the audio stream directly (if already AAC or ALAC) or decodes and re-encodes to AAC/ALAC within the M4A container. For AAC-in-CAF, stream copy is instant and lossless. For PCM-in-CAF, encoding to ALAC preserves lossless quality or to AAC at the desired bitrate. The M4A container adds ftyp, moov, and mdat atoms for universal Apple device compatibility.
Stream copy from AAC or ALAC in CAF preserves exact quality. PCM to ALAC in M4A is lossless. PCM to AAC in M4A depends on the chosen bitrate — 256 kbps is transparent for most listeners. The container conversion itself adds zero quality impact.
| Device | CAF | M4A |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
CAF to M4A is the standard Apple professional-to-consumer export. Stream copy preserves original quality when the CAF already contains AAC or ALAC.
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| No |
| Funktion | CAF | M4A |
|---|---|---|
| Fullstandigt namn | Core Audio Format | MPEG-4 Audio |
| Filandelse | .caf | .m4a |
| Bast for | Apple native | Better than MP3 |