File Convert

Convert AU to M4A

Free online AU-to-M4A converter — upload a AU file and download a M4A. Fast, private, no signup.

Loading the converter…

AU vs M4A

AU

Sun/NeXT AU — a simple, long-lived PCM audio container.

About AU ↗

M4A

MPEG-4 audio container (AAC/ALAC).

About M4A ↗

AU to M4A: frequently asked questions

How do I convert AU to M4A?

Drop your AU file into the converter above — we auto-detect the real format from its bytes, convert it, and give you a M4A to download. No software to install.

Is the AU to M4A converter free?

Yes. Convert AU to M4A for free right in your browser, with no account needed to get started.

Is it safe and private?

Your file is transferred over an encrypted connection and anonymous uploads are temporary. You can also view and strip metadata (location, device, author) before you download.

What's the difference between AU and M4A?

Sun/NeXT AU — a simple, long-lived PCM audio container. MPEG-4 audio container (AAC/ALAC).

Related conversions

Convert AU to: MP3 · WAV · FLAC · AAC · AC3 · AIFF · CAF · DTS · M4B · M4R

Convert to M4A from: AAC · AC3 · AIFF · AMR · APE · CAF · DFF · DSF · DTS · FLAC

Browse all supported formats →