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Convert AMR to M4B

Free online AMR-to-M4B converter — upload a AMR file and download a M4B. Fast, private, no signup.

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AMR vs M4B

AMR

Adaptive Multi-Rate — speech codec used by phones; convert-from only.

About AMR ↗

M4B

MPEG-4 audiobook (AAC, with chapter support).

About M4B ↗

AMR to M4B: frequently asked questions

How do I convert AMR to M4B?

Drop your AMR file into the converter above — we auto-detect the real format from its bytes, convert it, and give you a M4B to download. No software to install.

Is the AMR to M4B converter free?

Yes. Convert AMR to M4B 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 AMR and M4B?

Adaptive Multi-Rate — speech codec used by phones; convert-from only. MPEG-4 audiobook (AAC, with chapter support).

Related conversions

Convert AMR to: MP3 · WAV · FLAC · M4A · AAC · AC3 · AIFF · M4R · OGG · OPUS

Convert to M4B from: AAC · AC3 · AIFF · APE · FLAC · M4A · M4R · MP3 · OGG · OPUS

Browse all supported formats →