Bulk M4B to AIFF Converter Online — Free HD Quality
Drag and drop your multiple M4B files into this 100% free online M4B to AIFF converter (.m4b to .aiff), and click the Convert button to bulk convert them to AIFF format in HD quality. Use the quality slider to fine-tune your AIFF 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:How to convert OGA to WAV online?.
Drop your M4B files here to convert to AIFF, or click to browse
Converts .m4b to AIFF (.aiff) in HD quality — bulk, free, no signup
Choose FilesM4B vs AIFF — File Format Comparison
See how M4B and AIFF compare across file extension, MIME type, compression, and feature support. Related:M4B to AMR - free, no signup.
| Feature | M4B | AIFF |
|---|---|---|
| File Extension | .m4b | .aiff |
| MIME Type | audio/mp4 | audio/aiff |
| 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.
- Compression: Lossy
- Tags & Metadata: Supported
What Is AIFF Format?
Audio Interchange File Format — Apple's uncompressed audio standard functionally equivalent to WAV but preferred in professional Apple audio workflows and GarageBand projects.
- Compression: Lossless
- Tags & Metadata: Supported