Bulk M4B to M4R Converter Online — Free HD Quality
Drag and drop your multiple M4B files into this 100% free online M4B to M4R converter (.m4b to .m4r), and click the Convert button to bulk convert them to M4R format in HD quality. Use the quality slider to fine-tune your M4R 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:Convert APE files to MP3 in queue.
Drop your M4B files here to convert to M4R, or click to browse
Converts .m4b to M4R (.m4r) in HD quality — bulk, free, no signup
Choose FilesM4B vs M4R — File Format Comparison
See how M4B and M4R compare across file extension, MIME type, compression, and feature support. Related:Free M4B to ALAC converter.
| Feature | M4B | M4R |
|---|---|---|
| File Extension | .m4b | .m4r |
| MIME Type | audio/mp4 | audio/mp4 |
| Compression Type | Lossy | Lossy |
| 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 M4R Format?
iPhone Ringtone — AAC audio in an MP4 container under 40 seconds, the format iTunes and iPhone use for custom ringtones; identical to M4A in encoding but recognised by iOS as a ringtone file.
- Compression: Lossy
- Tags & Metadata: Supported