Convert M4B to ALAC Online — Free
Fast, free M4B to ALAC converter. No registration required.
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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 ALAC?
ALAC is Apple's lossless audio format. It provides CD-quality audio with smaller file sizes than WAV or AIFF, and is fully supported in iTunes and Apple devices.
Format Details
- Full Name
- Apple Lossless Audio Codec
- Extension
- .m4a
Key Features
- Lossless
- Apple native
- iTunes compatible
- CD quality
M4B vs ALAC
| Feature | M4B | ALAC |
|---|---|---|
| Full Name | MPEG-4 Audiobook | Apple Lossless Audio Codec |
| Extension | .m4b | .m4a |
| Best For | Chapter support | Lossless |