M4A to AU Converter — Free Online

Free online M4A to AU converter — quickly transform your audio files without registration or software installation. Our service lets you convert m4a to au in just a few clicks. Conversion happens right in your browser — files are never uploaded to a server and stay on your device. AU is a classic Unix/Sun format. Widely supported in scientific and professional software. Try our m4a to au converter right now!

🔄 How M4A to AU Converter Works

Our free m4a converter quickly produces AU files. Upload source files, choose settings, and click "Convert".

Batch conversion saves time — process multiple files in one session. Flexible bitrate settings help balance quality and size.

M4A to AU online — no software installation. Open the site on any device with a browser and start converting now.

🎯 Problems This Converter Solves

Can't open M4A file?

Not all software works with M4A. Convert to compatible AU.

💡 Common Uses for AU

📁 Convert to AU format

🔄 Change audio format

📱 Device compatibility

💾 Optimize file size

✨ Our Converter Advantages

⚡ Rapid Conversion

No waiting — results delivered immediately

📦 Bulk Processing

Save time by converting in batches

💻 All Platforms

Windows, Mac, Linux, iOS, Android — everywhere

🔒 Secure Handling

Your data stays private — no storage

🎵 Flexible Settings

Choose quality, bitrate, and other parameters

💰 No Payment

All features available free without an account

📊 Format Comparison

M4A Compact format

Apple container for AAC. Compatible with iTunes.

AU High quality

Sun Audio. Classic Unix format for software.

❓ Frequently Asked Questions

How do I change M4A to AU?

Drag and drop your M4A file, choose AU as target format, and start conversion. Download the result instantly.

Do I need to pay for M4A to AU conversion?

No payment needed. The service is free, with no subscriptions or hidden costs.

Is quality lost when converting M4A to AU?

Quality won't be restored — lost data can't be recovered. However, the file becomes compatible with lossless software.

Is batch M4A conversion supported?

Sure! Upload up to 10 M4A files and convert them all with a single click.

Is there a file size limit for M4A?

Maximum 100 MB per file. All processing happens locally on your computer.

Are my files uploaded to a server?

No, files stay on your device. The browser performs conversion locally using WebAssembly technology.

📝 How to Convert M4A to AU

1

Upload File

Drag & drop M4A files or click "Choose Files"

2

Adjust Settings

Choose quality, bitrate and other options

3

Convert

Click "Convert" and wait for processing

4

Download Result

Download your AU files