File Convert

Convert M4A to AU

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

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M4A vs AU

M4A

MPEG-4 audio container (AAC/ALAC).

About M4A ↗

AU

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

About AU ↗

M4A to AU: frequently asked questions

How do I convert M4A to AU?

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

Is the M4A to AU converter free?

Yes. Convert M4A to AU 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 M4A and AU?

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

Related conversions

Convert M4A to: MP3 · WAV · FLAC · AAC · AC3 · AIFF · CAF · DTS · M4B · M4R

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

Browse all supported formats →