File Convert

Convert M4R to AU

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

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M4R vs AU

M4R

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

About M4R ↗

AU

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

About AU ↗

M4R to AU: frequently asked questions

How do I convert M4R to AU?

Drop your M4R 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 M4R to AU converter free?

Yes. Convert M4R 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 M4R and AU?

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

Related conversions

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

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

Browse all supported formats →