AU to M4A Converter — Free Online

Free online AU to M4A converter — quickly transform your audio files without registration or software installation. Our service lets you convert au to m4a in just a few clicks. Conversion happens right in your browser — files are never uploaded to a server and stay on your device. M4A is Apple's container for high-quality audio. Perfect for iPhone, iPad and iTunes. Try our au to m4a converter right now!

🔄 How AU to M4A Converter Works

AU to M4A conversion is fast and convenient. Drag multiple files to upload area, and our online converter processes them in seconds.

Full control over quality: bitrate, sample rate, channels. Customize au to m4a conversion settings to your needs.

Processing runs locally in browser. Your files stay private — we never access your audio. Works on Windows, Mac, Linux, Android and iOS.

🎯 Problems This Converter Solves

Issues playing AU?

Convert to universal M4A format for better compatibility.

AU files slow to transfer?

Compact M4A downloads faster and uses less space.

Uploading podcast or music?

M4A is optimal for streaming and publishing.

Creating iPhone ringtone?

M4A is supported by all Apple devices.

💡 Common Uses for M4A

📱 Upload to iPhone/iPad

🎵 Add to iTunes/Apple Music

📺 YouTube video audio

💾 High-quality compression

✨ Our Converter Advantages

⚡ Speed Optimized

Optimized algorithms for lightning-fast processing

📦 Group Convert

Up to 10 audio files in one session

🌐 Universal Access

Open in browser and start converting

🔒 Complete Security

Your files are protected and auto-deleted after processing

🎛️ Full Control

Adjust audio quality to your needs

💰 Free Service

Convert as much as you want — it costs nothing

📊 Format Comparison

AU High quality

Sun Audio. Classic Unix format for software.

M4A Compact format

Apple container for AAC. Compatible with iTunes.

❓ Frequently Asked Questions

How can I transform AU to M4A?

Open the converter page, add your AU file, select M4A, and click the convert button. Download when ready.

Is the AU to M4A converter free?

Absolutely free! Convert as many files as you want without registration or payment.

What quality can I expect after AU to M4A conversion?

Lossy compression reduces quality slightly. We recommend 256-320 kbps for best results.

How many AU files can I process at once?

Up to 10 files per session. All processed in parallel in your browser.

What size files can I convert?

Up to 100 megabytes. Browser conversion doesn't upload files to server — fully private.

Is AU to M4A conversion secure?

Completely secure! Processing happens in browser, your AU files are never transmitted anywhere.

📝 How to Convert AU to M4A

1

Upload File

Drag & drop AU 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 M4A files