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AU to AMR-WB - Online Audio Converter
Convert AU to AMR-WB online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AU to AMR-WB
Drop AU audio here or click to select
AU
AMR-WB (AMR-WB)
About AU to AMR-WB
Convert AU to AMR-WB. AU is Sun's simple container, usually holding 8 kHz telephony audio. AMR-WB widens speech to 16 kHz for HD voice calls. 16 kHz sampling caps highs; keep a master for music..
Why convert AU to AMR-WB?
- Smaller files with AMR-WB lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AU vs AMR-WB
| Codec | PCM 16-bit | AMR-WB |
|---|---|---|
| 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. | AMR-WB widens speech to 16 kHz for HD voice calls. |
When not to convert AU to AMR-WB
- Skip AMR-WB 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 AMR-WB 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. 16 kHz sampling caps highs; keep a master for music. Encode AMR-WB (AMR-WB) 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 AMR-WB?
Drop your AU file onto this page, choose quality and codec settings, then click Convert. The result downloads as AMR-WB instantly. All processing runs in your browser.
What codec is used for AMR-WB?
The default codec for AMR-WB is AMR-WB. 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.