Is it free to convert between WMA and AU?

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

.wma

.au

WMA vs AU

Compare Windows Media Audio and Sun Audio formats — understand the key differences and when to use each

Format Overview

WMA

Windows Media Audio

Windows Media Audio (.wma) is a audio file format.

.wmaaudio

AU

Sun Audio

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

.auaudio

WMA vs AU: Feature Comparison

Feature	WMA	AU
Full Name	Windows Media Audio	Sun Audio
File Extension	.wma	.au
Category	audio	audio
Free to Convert	✓ Yes	✓ Yes
Browser Support	✓ All Browsers	✓ All Browsers
Convert to Each Other	✓ Yes	✓ Yes

When to Use WMA vs AU

Use WMA when you need:

•Files in Windows Media 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

WMA AU AU WMA

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Learn More About These Formats

WMA Converter AU Converter

Frequently Asked Questions

What is the difference between WMA and AU?

WMA (Windows Media Audio) and AU (Sun Audio) are both audio file formats. WMA files use the .wma extension while AU uses .au. They differ in compression, quality, compatibility, and intended use cases.

Can I convert WMA to AU for free?

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

It depends on your use case. WMA (Windows Media 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.

WMA Converter

Convert from WMA

AU Converter

Convert from AU

File Tools

Compress, resize, merge

Convert to WMA

All sources → WMA

Convert to AU

All sources → AU

Format Statistics

Trends & data 2025

More Format Comparisons

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Feature

WMA

Full Name