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Opus to AU - Online Audio Converter
Convert Opus to AU online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert Opus to AU
Drop Opus audio here or click to select
Opus
AU (PCM 16-bit)
About Opus to AU
Convert Opus to AU. Opus adapts from 6 kbps speech to 510 kbps music with low latency. AU is Sun's simple container, usually holding 8 kHz telephony audio. Headers are minimal; verify sample rate after conversion..
Why convert Opus to AU?
- Larger files than lossy shares with AU uncompressed quality.
- Keep quality where supported.
- Private, no upload - runs in your browser.
Opus vs AU
| Codec | Opus | PCM 16-bit |
|---|---|---|
| Compression | lossy | uncompressed |
| Sample behavior | Quality set by bitrate | Full quality kept |
| Typical use | Opus adapts from 6 kbps speech to 510 kbps music with low latency. | AU is Sun's simple container, usually holding 8 kHz telephony audio. |
When not to convert Opus to AU
- Skip AU for the smallest share: lossless output stays large, so prefer a lossy target when sending Opus files.
- Keep a master copy: repeated exports stack small losses, so archive Opus before batch AU shares.
Limits
Starting point: Opus - Opus adapts from 6 kbps speech to 510 kbps music with low latency. CD-era hardware may not decode it; use MP3 for legacy players. Headers are minimal; verify sample rate after conversion. Encode AU (PCM 16-bit) from Opus 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 Opus to AU?
Drop your Opus 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.