Bulk ALAC to M4B Converter Online — Free HD Quality
Drag and drop your multiple ALAC files into this 100% free online ALAC to M4B converter (.alac to .m4b), and click the Convert button to bulk convert them to M4B format in HD quality. Use the quality slider to fine-tune your M4B output, then download your converted files one by one or as a single ZIP — no signup and no downloads needed, and your original ALAC files are removed from our servers right after. Also see:How to turn CAF into WAV?.
Drop your ALAC files here to convert to M4B, or click to browse
Converts .alac to M4B (.m4b) in HD quality — bulk, free, no signup
Choose FilesALAC vs M4B — File Format Comparison
See how ALAC and M4B compare across file extension, MIME type, compression, and feature support. Related:Free ALAC to MP2 - no account needed.
| Feature | ALAC | M4B |
|---|---|---|
| File Extension | .alac | .m4b |
| MIME Type | audio/mp4 | audio/mp4 |
| Compression Type | Lossless | Lossy |
| Metadata Support | Yes | Yes |
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. See also:Free ALAC to AMR converter.
- Compression: Lossless
- Tags & Metadata: Supported
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.
- Compression: Lossy
- Tags & Metadata: Supported