Convert M4B to MP3 Online — Free
Fast, free M4B to MP3 converter. No registration required.
Secure Transfer
HTTPS encrypted uploads
Privacy First
Files auto-deleted after processing
No Registration
Start converting instantly
Works Everywhere
Any browser, any device
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 .mp3 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 MP3?
MP3 is the most popular audio format worldwide. It uses lossy compression to reduce file size while maintaining acceptable audio quality for most listeners.
Format Details
- Full Name
- MPEG Audio Layer III
- Extension
- .mp3
Key Features
- Universal compatibility
- Small file sizes
- Streaming support
- ID3 tag support
M4B vs MP3
| Feature | M4B | MP3 |
|---|---|---|
| Full Name | MPEG-4 Audiobook | MPEG Audio Layer III |
| Extension | .m4b | .mp3 |
| Best For | Chapter support | Universal compatibility |