File Convert

Convert MP4 to M4B

Free online MP4-to-M4B converter — upload a MP4 file and download a M4B. Fast, private, no signup.

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MP4 vs M4B

MP4

MPEG-4 video container; the web/mobile default.

About MP4 ↗

M4B

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

About M4B ↗

MP4 to M4B: frequently asked questions

How do I convert MP4 to M4B?

Drop your MP4 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 MP4 to M4B converter free?

Yes. Convert MP4 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 MP4 and M4B?

MPEG-4 video container; the web/mobile default. MPEG-4 audiobook (AAC, with chapter support).

Related conversions

Convert MP4 to: MOV · MKV · WEBM · 3GP · AVI · FLV · MPEG · OGV · TS · WMV

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

Browse all supported formats →