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AU to CAF - Online Audio Converter
Convert AU to CAF online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AU to CAF
Drop AU audio here or click to select
AU
CAF (PCM 16-bit)
About AU to CAF
Convert AU to CAF. AU is Sun's simple container, usually holding 8 kHz telephony audio. CAF is Apple's 64-bit container for large recordings beyond WAV limits. Few Windows tools open it; convert WAV for sharing..
Why convert AU to CAF?
- Larger files than lossy shares with CAF uncompressed quality.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AU vs CAF
| Codec | PCM 16-bit | PCM 16-bit |
|---|---|---|
| Compression | uncompressed | uncompressed |
| Sample behavior | Full quality kept | Full quality kept |
| Typical use | AU is Sun's simple container, usually holding 8 kHz telephony audio. | CAF is Apple's 64-bit container for large recordings beyond WAV limits. |
When not to convert AU to CAF
- Skip CAF for the smallest share: lossless output stays large, so prefer a lossy target when sending AU files.
- Keep a master copy: repeated exports stack small losses, so archive AU before batch CAF shares.
Limits
Starting point: AU - AU is Sun's simple container, usually holding 8 kHz telephony audio. Headers are minimal; verify sample rate after conversion. Few Windows tools open it; convert WAV for sharing. Encode CAF (PCM 16-bit) from AU at 256k for music or 128k for speech, starting from the master.
How conversion works
Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.
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FAQ
How do I convert AU to CAF?
Drop your AU file onto this page, choose quality and codec settings, then click Convert. The result downloads as CAF instantly. All processing runs in your browser.
What codec is used for CAF?
The default codec for CAF is PCM 16-bit. You can change audio parameters in Advanced mode.
How do you store my files?
We do not store any processed audio. All conversion happens entirely in your browser using FFmpeg WASM.