Bulk M4B to ALAC Converter Online — Free HD Quality
Drag and drop your multiple M4B files into this 100% free online M4B to ALAC converter (.m4b to .alac), and click the Convert button to bulk convert them to ALAC format in HD quality. Use the quality slider to fine-tune your ALAC output, then download your converted files one by one or as a single ZIP — no signup and no downloads needed, and your original M4B files are removed from our servers right after. Also see:Simple APE to MP3 tool.
Drop your M4B files here to convert to ALAC, or click to browse
Converts .m4b to ALAC (.alac) in HD quality — bulk, free, no signup
Choose FilesM4B vs ALAC — File Format Comparison
See how M4B and ALAC compare across file extension, MIME type, compression, and feature support. Related:Convert M4B files in bulk to AIF.
| Feature | M4B | ALAC |
|---|---|---|
| File Extension | .m4b | .alac |
| MIME Type | audio/mp4 | audio/mp4 |
| Compression Type | Lossy | Lossless |
| Metadata Support | Yes | Yes |
What Is M4B Format?
MPEG-4 Audiobook — AAC audio in an MP4 container with bookmarking support, the standard format for audiobooks on Apple Books, Audible exports, and iPhone podcasts. See also:Convert M4B to M4R.
- Compression: Lossy
- Tags & Metadata: Supported
What Is ALAC Format?
Apple Lossless Audio Codec — Apple's open-source lossless compression stored in an MP4 container, offering bit-perfect quality with 40–60% smaller files than AIFF; the native lossless format for Apple Music and iTunes.
- Compression: Lossless
- Tags & Metadata: Supported