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AU to MPEG-4 SLS - Online Audio Converter
Convert AU to MPEG-4 SLS online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AU to MPEG-4 SLS
Drop AU audio here or click to select
AU
MPEG-4 SLS (MPEG-4 SLS)
About AU to MPEG-4 SLS
Convert AU to MPEG-4 SLS. AU is Sun's simple container, usually holding 8 kHz telephony audio. MPEG-4 SLS scales AAC losslessly with a backward-compatible core. Core-only players drop the lossless layer; verify output..
Why convert AU to MPEG-4 SLS?
- Larger files than lossy shares with MPEG-4 SLS lossless scalable quality.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AU vs MPEG-4 SLS
| Codec | PCM 16-bit | MPEG-4 SLS |
|---|---|---|
| Compression | uncompressed | lossless scalable |
| Sample behavior | Full quality kept | Full quality kept |
| Typical use | AU is Sun's simple container, usually holding 8 kHz telephony audio. | MPEG-4 SLS scales AAC losslessly with a backward-compatible core. |
When not to convert AU to MPEG-4 SLS
- Skip MPEG-4 SLS 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 MPEG-4 SLS 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. Core-only players drop the lossless layer; verify output. Encode MPEG-4 SLS (MPEG-4 SLS) 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 MPEG-4 SLS?
Drop your AU file onto this page, choose quality and codec settings, then click Convert. The result downloads as MPEG-4 SLS instantly. All processing runs in your browser.
What codec is used for MPEG-4 SLS?
The default codec for MPEG-4 SLS is MPEG-4 SLS. 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.