File Convert

Convert AU to M4R

Free online AU-to-M4R converter — upload a AU file and download a M4R. Fast, private, no signup.

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AU vs M4R

AU

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

About AU ↗

M4R

iPhone ringtone (AAC in an MPEG-4 container).

About M4R ↗

AU to M4R: frequently asked questions

How do I convert AU to M4R?

Drop your AU file into the converter above — we auto-detect the real format from its bytes, convert it, and give you a M4R to download. No software to install.

Is the AU to M4R converter free?

Yes. Convert AU to M4R 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 M4R?

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

Related conversions

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

Convert to M4R from: AAC · AC3 · AIFF · AMR · APE · CAF · DFF · DSF · DTS · FLAC

Browse all supported formats →