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Bulk M4P to M4B Converter Online — Free HD Quality

Drag and drop your multiple M4P files into this 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 — your original M4P 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

M4P vs M4B — File Format Comparison

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

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