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AU to AC3 - Online Audio Converter
Convert AU to AC3 online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AU to AC3
Drop AU audio here or click to select
AU
AC3 (AC-3)
About AU to AC3
Convert AU to AC3. AU is Sun's simple container, usually holding 8 kHz telephony audio. AC3 (Dolby Digital) carries 5.1 surround on DVDs and broadcasts. Downmix choices change loudness; check levels after conversion..
Why convert AU to AC3?
- Smaller files with AC3 lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AU vs AC3
| Codec | PCM 16-bit | AC-3 |
|---|---|---|
| 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. | AC3 (Dolby Digital) carries 5.1 surround on DVDs and broadcasts. |
When not to convert AU to AC3
- Skip AC3 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 AC3 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. Downmix choices change loudness; check levels after conversion. Encode AC3 (AC-3) 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 AC3?
Drop your AU file onto this page, choose quality and codec settings, then click Convert. The result downloads as AC3 instantly. All processing runs in your browser.
What codec is used for AC3?
The default codec for AC3 is AC-3. 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.