Convert M4B to iPhone Audio Online — Free
Fast, free M4B to iPhone Audio 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 .m4a 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 iPhone Audio?
iPhone-optimized audio format using AAC encoding at 256kbps. Configured for high-quality playback on iPhone devices with full Apple ecosystem compatibility.
Format Details
- Full Name
- iPhone Compatible Audio
- Extension
- .m4a
Key Features
- iPhone optimized
- AAC 256kbps
- Apple ecosystem
- AirPlay compatible
M4B vs iPhone Audio
| Feature | M4B | iPhone Audio |
|---|---|---|
| Full Name | MPEG-4 Audiobook | iPhone Compatible Audio |
| Extension | .m4b | .m4a |
| Best For | Chapter support | iPhone optimized |