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HomeAC3 vs AU
.ac3
.au

AC3 vs AU

Compare Dolby Digital Audio and Sun Audio formats — understand the key differences and when to use each

Format Overview

AC3

Dolby Digital Audio

Dolby Digital Audio (.ac3) is a audio file format.

.ac3audio

AU

Sun Audio

Sun Audio (.au) is a audio file format.

.auaudio

AC3 vs AU: Feature Comparison

FeatureAC3AU
Full NameDolby Digital AudioSun Audio
File Extension.ac3.au
Categoryaudioaudio
Free to Convert✓ Yes✓ Yes
Browser Support✓ All Browsers✓ All Browsers
Convert to Each Other✓ Yes✓ Yes

When to Use AC3 vs AU

Use AC3 when you need:

  • •Files in Dolby Digital Audio format for maximum compatibility
  • •Industry-standard audio format support
  • •Wide software and platform compatibility

Use AU when you need:

  • •Files in Sun Audio format for specific workflows
  • •Optimized audio format features
  • •Modern format advantages and smaller file sizes

Convert Between Them

AC3 AUAU AC3
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AC3 Converter AU Converter

Frequently Asked Questions

What is the difference between AC3 and AU?
AC3 (Dolby Digital Audio) and AU (Sun Audio) are both audio file formats. AC3 files use the .ac3 extension while AU uses .au. They differ in compression, quality, compatibility, and intended use cases.
Can I convert AC3 to AU for free?
Yes! Convert999 lets you convert AC3 to AU completely free, directly in your browser. No file upload to any server, no registration needed — your files stay private on your device.
Which is better, AC3 or AU?
It depends on your use case. AC3 (Dolby Digital Audio) may be better for certain workflows, while AU (Sun Audio) excels in others. Consider factors like file size, quality, software compatibility, and your specific needs.
Is it safe to convert files on Convert999?
Absolutely. Convert999 processes all files 100% locally in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

AC3 Converter

Convert from AC3

AU Converter

Convert from AU

File Tools

Compress, resize, merge

Convert to AC3

All sources → AC3

Convert to AU

All sources → AU

Format Statistics

Trends & data 2025

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