Convert CAF to M4A — Free Online Converter

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.