Is it free to convert between AMR and AU?

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

.amr

.au

AMR vs AU

Compare Adaptive Multi-Rate Audio and Sun Audio formats — understand the key differences and when to use each

Format Overview

AMR

Adaptive Multi-Rate Audio

Adaptive Multi-Rate Audio (.amr) is a audio file format.

.amraudio

AU

Sun Audio

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

.auaudio

AMR vs AU: Feature Comparison

Feature	AMR	AU
Full Name	Adaptive Multi-Rate Audio	Sun Audio
File Extension	.amr	.au
Category	audio	audio
Free to Convert	✓ Yes	✓ Yes
Browser Support	✓ All Browsers	✓ All Browsers
Convert to Each Other	✓ Yes	✓ Yes

When to Use AMR vs AU

Use AMR when you need:

•Files in Adaptive Multi-Rate 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

AMR AU AU AMR

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Learn More About These Formats

AMR Converter AU Converter

Frequently Asked Questions

What is the difference between AMR and AU?

AMR (Adaptive Multi-Rate Audio) and AU (Sun Audio) are both audio file formats. AMR files use the .amr extension while AU uses .au. They differ in compression, quality, compatibility, and intended use cases.

Can I convert AMR to AU for free?

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

It depends on your use case. AMR (Adaptive Multi-Rate 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.

AMR Converter

Convert from AMR

AU Converter

Convert from AU

File Tools

Compress, resize, merge

Convert to AMR

All sources → AMR

Convert to AU

All sources → AU

Format Statistics

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Feature

AMR

Full Name