Bulk M4P to M4B Converter Online — Free HD Quality
Drag and drop your multiple M4P files into this 100% free online M4P to M4B converter (.m4p 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 M4P files are removed from our servers right after. Also see:Simple APE to WAV tool.
Drop your M4P files here to convert to M4B, or click to browse
Converts .m4p to M4B (.m4b) in HD quality — bulk, free, no signup
Choose FilesM4P vs M4B — File Format Comparison
See how M4P and M4B compare across file extension, MIME type, compression, and feature support. Related:Turn M4P into ALAC.
| Feature | M4P | M4B |
|---|---|---|
| File Extension | .m4p | .m4b |
| MIME Type | audio/mp4 | audio/mp4 |
| Compression Type | Lossy | Lossy |
| Metadata Support | Yes | Yes |
What Is M4P Format?
Protected MPEG-4 Audio — Apple's FairPlay DRM-protected AAC format used in early iTunes Store purchases; non-DRM M4P files (iTunes DRM removal, 2009) can be converted, but actively DRM-locked files will fail.
- Compression: Lossy
- 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