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ADPCM to AU - Online Audio Converter
Convert ADPCM to AU online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert ADPCM to AU
Drop ADPCM audio here or click to select
ADPCM, WAV
AU (PCM 16-bit)
About ADPCM to AU
Convert ADPCM to AU. ADPCM predicts samples to quarter voice-band bitrates. AU is Sun's simple container, usually holding 8 kHz telephony audio. Headers are minimal; verify sample rate after conversion..
Why convert ADPCM to AU?
- Larger files than lossy shares with AU uncompressed quality.
- Keep quality where supported.
- Private, no upload - runs in your browser.
ADPCM vs AU
| Codec | ADPCM | PCM 16-bit |
|---|---|---|
| Compression | lossy | uncompressed |
| Sample behavior | Quality set by bitrate | Full quality kept |
| Typical use | ADPCM predicts samples to quarter voice-band bitrates. | AU is Sun's simple container, usually holding 8 kHz telephony audio. |
When not to convert ADPCM to AU
- Skip AU for the smallest share: lossless output stays large, so prefer a lossy target when sending ADPCM files.
- Keep a master copy: repeated exports stack small losses, so archive ADPCM before batch AU shares.
Limits
Starting point: ADPCM - ADPCM predicts samples to quarter voice-band bitrates. Variants differ by vendor, so confirm the flavor before converting. Headers are minimal; verify sample rate after conversion. Encode AU (PCM 16-bit) from ADPCM 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 ADPCM to AU?
Drop your ADPCM file onto this page, choose quality and codec settings, then click Convert. The result downloads as AU instantly. All processing runs in your browser.
What codec is used for AU?
The default codec for AU 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.