Convert M4B to 3GP Online — Free
Fast, free M4B to 3GP converter. No registration required.
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How to Convert
Upload your .m4b file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .3gp file when it's ready.
What is M4B?
M4B is the MPEG-4 audiobook format used by Apple iTunes and many audiobook platforms. It supports chapter markers, bookmarking, and AAC compression for efficient audiobook delivery.
Format Details
- Full Name
- MPEG-4 Audiobook
- Extension
- .m4b
Key Features
- Chapter support
- Bookmark resume
- iTunes compatible
- AAC compression
What is 3GP?
3GP is a multimedia container format designed for 3G mobile phones. It's optimized for low bandwidth and storage, making videos smaller but lower quality.
Format Details
- Full Name
- 3GPP Multimedia
- Extension
- .3gp
Key Features
- Mobile optimized
- Small file size
- 3G network compatible
- Low bandwidth
M4B vs 3GP
| Feature | M4B | 3GP |
|---|---|---|
| Full Name | MPEG-4 Audiobook | 3GPP Multimedia |
| Extension | .m4b | .3gp |
| Best For | Chapter support | Mobile optimized |