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Bulk M4B to M4R Converter Online — Free HD Quality

Drag and drop your multiple M4B files into this 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 — your original M4B files are removed from our servers right after.

To:
85%

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PNG, JPG, WebP, GIF, HEIC, RAW, PSD, SVG and more

Max 100MB per file

M4B vs M4R — File Format Comparison

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

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