Convert Core Audio Format (.caf) to Advanced Audio Coding (.aac) 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 .aac file when it's ready.
CAF (Core Audio Format) is Apple's professional audio container supporting any codec, unlimited file sizes, and rich metadata including channel layouts, markers, and regions. CAF is the native recording format for Logic Pro and macOS Core Audio applications. AAC (Advanced Audio Coding) is the industry-standard lossy codec used by iTunes, YouTube, Apple Music, and every major streaming platform.
Converting CAF to AAC extracts and re-encodes the audio (or directly copies if the CAF already contains AAC) into the universally compatible M4A container. This is the standard workflow for preparing macOS professional recordings for distribution.
CAF is a macOS-only format with no support on Windows, Linux, Android, or web browsers. AAC in M4A is universally playable — every device and platform supports it. Converting CAF to AAC enables distribution, sharing, and playback outside the macOS professional audio environment.
If the CAF already contains AAC audio, the conversion can be a zero-quality-loss remux — simply repackaging the AAC stream from CAF into M4A without re-encoding. This is the fastest and highest-quality path when the source is already AAC-encoded.
FFmpeg reads the CAF container, identifies the enclosed codec, and either copies the AAC stream directly (-c:a copy if already AAC) or decodes to PCM and re-encodes to AAC. The output is wrapped in an M4A container with proper ftyp, moov, and mdat atoms. CAF metadata including markers and regions does not transfer to M4A (which lacks these features), but basic tags and channel layout information is preserved.
If the CAF contains AAC audio, stream copy produces identical quality. If the CAF contains PCM or ALAC, the AAC encoding from lossless produces optimal quality for the chosen bitrate. At 256 kbps AAC-LC, quality is transparent for most listeners. If the CAF contains another lossy codec, transcoding introduces generation loss.
| Device | CAF | AAC |
|---|---|---|
| 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 AAC is the standard export path from macOS professional audio to universal distribution. Stream copy from AAC-in-CAF is instant and lossless.
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| No |
| Funktion | CAF | AAC |
|---|---|---|
| Fullstandigt namn | Core Audio Format | Advanced Audio Coding |
| Filandelse | .caf | .aac |
| Bast for | Apple native | Superior to MP3 |