Audio Conversion
Convert AU to Opus Online — Free
Fast, free AU to Opus converter. No registration required.
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How to Convert
1
Upload your .au file by dragging it into the upload area or clicking to browse.
2
Choose your output settings. The default settings work great for most files.
3
Click Convert and download your .opus file when it's ready.
What is AU?
AU is an audio format created by Sun Microsystems. It's one of the oldest digital audio formats, commonly used on Unix and Java platforms.
Format Details
- Full Name
- Sun Microsystems Audio
- Extension
- .au
Key Features
- Unix standard
- Java audio
- Simple format
- Legacy support
What is Opus?
Opus is a modern audio codec designed for interactive speech and audio transmission. It provides excellent quality at low bitrates and is widely used in VoIP and streaming.
Format Details
- Full Name
- Opus Audio Codec
- Extension
- .opus
Key Features
- Low latency
- Excellent compression
- Voice optimized
- Open source
AU vs Opus
| Feature | AU | Opus |
|---|---|---|
| Full Name | Sun Microsystems Audio | Opus Audio Codec |
| Extension | .au | .opus |
| Best For | Unix standard | Low latency |
Frequently Asked Questions
Yes. You can convert up to 5 files per day completely free, with no watermark or registration required.
Most files convert in under 30 seconds. Larger files (over 500MB) may take 1-3 minutes.
No. Our converter uses optimized encoding settings by default to preserve the original quality.
Free users can convert files up to 100MB. Pro users can convert files up to 2GB.
Yes. Our converter works in any modern web browser on any device.