Is it free to convert between AU and CAF?

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

.au

.caf

AU vs CAF

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

Format Overview

AU

Sun Audio

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

.auaudio

CAF

Core Audio Format

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

.cafaudio

AU vs CAF: Feature Comparison

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

When to Use AU vs CAF

Use AU when you need:

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

Use CAF when you need:

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

Convert Between Them

AU CAF CAF AU

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Frequently Asked Questions

What is the difference between AU and CAF?

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

Can I convert AU to CAF for free?

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

It depends on your use case. AU (Sun Audio) may be better for certain workflows, while CAF (Core Audio Format) 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.

AU Converter

Convert from AU

CAF Converter

Convert from CAF

File Tools

Compress, resize, merge

Convert to AU

All sources → AU

Convert to CAF

All sources → CAF

Format Statistics

Trends & data 2025

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Feature

CAF

Full Name