All Tools
[ audio bench ]
AU to ADPCM - Online Audio Converter
Convert AU to ADPCM online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AU to ADPCM
Drop AU audio here or click to select
AU
ADPCM (ADPCM)
About AU to ADPCM
Convert AU to ADPCM. AU is Sun's simple container, usually holding 8 kHz telephony audio. ADPCM predicts samples to quarter voice-band bitrates. Variants differ by vendor, so confirm the flavor before converting..
Why convert AU to ADPCM?
- Smaller files with ADPCM lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AU vs ADPCM
| Codec | PCM 16-bit | ADPCM |
|---|---|---|
| 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. | ADPCM predicts samples to quarter voice-band bitrates. |
When not to convert AU to ADPCM
- Skip ADPCM 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 ADPCM 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. Variants differ by vendor, so confirm the flavor before converting. Encode ADPCM (ADPCM) 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.
Related conversions
FAQ
How do I convert AU to ADPCM?
Drop your AU file onto this page, choose quality and codec settings, then click Convert. The result downloads as ADPCM instantly. All processing runs in your browser.
What codec is used for ADPCM?
The default codec for ADPCM is ADPCM. 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.