Is it free to convert between AU and AIF?

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

.au

.aif

AU vs AIF

Compare Sun Audio and Audio Interchange File 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

AIF

Audio Interchange File Format

Audio Interchange File Format (.aif) is a audio file format.

.aifaudio

AU vs AIF: Feature Comparison

Feature	AU	AIF
Full Name	Sun Audio	Audio Interchange File Format
File Extension	.au	.aif
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 AIF

Use AU when you need:

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

Use AIF when you need:

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

Convert Between Them

AU AIF AIF AU

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Frequently Asked Questions

What is the difference between AU and AIF?

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

Can I convert AU to AIF for free?

Yes! Convert999 lets you convert AU to AIF 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 AIF?

It depends on your use case. AU (Sun Audio) may be better for certain workflows, while AIF (Audio Interchange File 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

AIF Converter

Convert from AIF

File Tools

Compress, resize, merge

Convert to AU

All sources → AU

Convert to AIF

All sources → AIF

Format Statistics

Trends & data 2025

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Feature

AIF

Full Name