Is it free to convert between CAF and AU?

Yes, Convert999 is 100% free. All conversions happen locally in your browser with no file size limits, no registration, and no watermarks.

.caf

.au

CAF vs AU

Compare Core Audio Format and Sun Audio formats — understand the key differences and when to use each

Format Overview

CAF

Core Audio Format

Core Audio Format (.caf) is a audio file format.

.cafaudio

AU

Sun Audio

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

.auaudio

CAF vs AU: Feature Comparison

Feature	CAF	AU
Full Name	Core Audio Format	Sun Audio
File Extension	.caf	.au
Category	audio	audio
Free to Convert	✓ Yes	✓ Yes
Browser Support	✓ All Browsers	✓ All Browsers
Convert to Each Other	✓ Yes	✓ Yes

When to Use CAF vs AU

Use CAF when you need:

•Files in Core Audio Format 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

CAF AU AU CAF

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Frequently Asked Questions

What is the difference between CAF and AU?

CAF (Core Audio Format) and AU (Sun Audio) are both audio file formats. CAF files use the .caf extension while AU uses .au. They differ in compression, quality, compatibility, and intended use cases.

Can I convert CAF to AU for free?

Yes! Convert999 lets you convert CAF 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, CAF or AU?

It depends on your use case. CAF (Core Audio Format) 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.

CAF Converter

Convert from CAF

AU Converter

Convert from AU

File Tools

Compress, resize, merge

Convert to CAF

All sources → CAF

Convert to AU

All sources → AU

Format Statistics

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Feature

CAF

Full Name