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AU to CELT - Online Audio Converter
Convert AU to CELT online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AU to CELT
Drop AU audio here or click to select
AU
CELT (CELT)
About AU to CELT
Convert AU to CELT. AU is Sun's simple container, usually holding 8 kHz telephony audio. CELT is the low-delay music layer later merged into Opus. Stand-alone files are rare; prefer Opus targets..
Why convert AU to CELT?
- Smaller files with CELT lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AU vs CELT
| Codec | PCM 16-bit | CELT |
|---|---|---|
| Compression | uncompressed | lossy |
| Sample behavior | Full quality kept | Quality set by bitrate |
| Typical use | AU is Sun's simple container, usually holding 8 kHz telephony audio. | CELT is the low-delay music layer later merged into Opus. |
When not to convert AU to CELT
- Skip CELT for archival masters: lossy compression discards detail, so keep the AU original.
- Keep a master copy: repeated exports stack small losses, so archive AU before batch CELT 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. Stand-alone files are rare; prefer Opus targets. Encode CELT (CELT) 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 CELT?
Drop your AU file onto this page, choose quality and codec settings, then click Convert. The result downloads as CELT instantly. All processing runs in your browser.
What codec is used for CELT?
The default codec for CELT is CELT. 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.