File Convert

Convert M4A to M4B

Free online M4A-to-M4B converter — upload a M4A file and download a M4B. Fast, private, no signup.

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M4A vs M4B

M4A

MPEG-4 audio container (AAC/ALAC).

About M4A ↗

M4B

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

About M4B ↗

M4A to M4B: frequently asked questions

How do I convert M4A to M4B?

Drop your M4A 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 M4A to M4B converter free?

Yes. Convert M4A 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 M4A and M4B?

MPEG-4 audio container (AAC/ALAC). MPEG-4 audiobook (AAC, with chapter support).

Related conversions

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

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

Browse all supported formats →