Is it free to convert between AU and AC3?

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

.au

.ac3

AU vs AC3

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

Format Overview

AU

Sun Audio

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

.auaudio

AC3

Dolby Digital Audio

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

.ac3audio

AU vs AC3: Feature Comparison

Feature	AU	AC3
Full Name	Sun Audio	Dolby Digital Audio
File Extension	.au	.ac3
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 AC3

Use AU when you need:

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

Use AC3 when you need:

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

Convert Between Them

AU AC3 AC3 AU

اختر الملفات

أو اسحب وأفلت الملفات هنا

الحد الأقصى لحجم الملف: 2 جيجابايت

يتم معالجة ملفاتك محلياً في متصفحك. لا يتم تحميل أي شيء إلى أي خادم.

Learn More About These Formats

AU Converter AC3 Converter

Frequently Asked Questions

What is the difference between AU and AC3?

AU (Sun Audio) and AC3 (Dolby Digital Audio) are both audio file formats. AU files use the .au extension while AC3 uses .ac3. They differ in compression, quality, compatibility, and intended use cases.

Can I convert AU to AC3 for free?

Yes! Convert999 lets you convert AU to AC3 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 AC3?

It depends on your use case. AU (Sun Audio) may be better for certain workflows, while AC3 (Dolby Digital 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.

AU Converter

Convert from AU

AC3 Converter

Convert from AC3

File Tools

Compress, resize, merge

Convert to AU

All sources → AU

Convert to AC3

All sources → AC3

Format Statistics

Trends & data 2025

More Format Comparisons

JPGvsPNG PNGvsWEBP JPGvsWEBP SVGvsPNG HEICvsJPG BMPvsJPG TIFFvsJPG GIFvsPNG

Feature

AC3

Full Name