whats is the most accepted digital book format? EPUB?

What is EPUB?


  • The EPUB content standard allows publishers to produce and send a single digital publication file through distribution and offers consumers interoperability between software/hardware for unencrypted reflowable digital books and other publications.

“.epub” Extension

  • “.epub” is the file extension for EPUB reflowable digital books and publications.

EPUB Acronym Soup

  • Container: OCF (Open [OEBPS] Container Format)
    • ZIP-based archive of publication parts
    • Really just one extra file to point to root of publication and a defined directory structure
    • Define mechanism for inclusion of alternate renditions,
    • cryptography, signatures and rights information
    • It’s just ZIP!
  • Markup packaging: OPF (Open Packaging Format)
  • Markup content: OPS (Open Publication Structure); XHTML & DTBook

EPUB is an OPS/OPF publication in an OCF container

What’s the difference between EPUB & PDF?

  • PDF is pre-paginated and not easily re-flowed
  1. “Zoom” a PDF, see the upper left
  2. PDF is a print and print-archive format
  • EPUB content, like XHTML, is re-flowable
  1. If paginated, when zoomed, there will be more “pages”
  2. OPS is a re-flowable “electronic content” format
  3. Adobe’s Digital Editions has adopted EPUB for such content

EPUB validator:



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