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Validator for EPUB files
License:New BSD License
Platforms:Any OS with Java (1.6 or above)



EpubCheck is a tool to validate EPUB files. It is also able to extract technical characteristics and embedded metadata from an EPUB file. Both the EPUB 2 and EPUB 3 formats are supported. It can detect many types of errors in EPUB. OCF container structure, OPF and OPS mark-up, and internal reference consistency are checked. EpubCheck can be run as a standalone command-line tool or used as a Java library. Development of this tool is supported by the International Digital Publishing Forum (IDPF), which also publishes the EPUB standards. Most of the EpubCheck functionality comes from the schema validation tool Jing and schemas that were developed by IDPF and DAISY. Initial EpubCheck development was largely done at Adobe Systems.


Authors and contributors to EpubCheck include:

  • Peter Sorotokin
  • Garth Conboy
  • Markus Gylling
  • Piotr Kula
  • Paul Norton
  • Jessica Hekman
  • Liza Daly
  • George Bina
  • Bogdan Iordache
  • Romain Deltour
  • Thomas Ledoux
  • Tobias Fischer
  • Steve Antoch
  • Arwen Pond
  • Masayoshi Takahashi
  • Satoshi Kojima

Documentation and user support

Using EPubCheck as command line tool, all detected errors are simply printed to stderr output stream. There is no native graphical user interface (GUI) for the tool. However, there are some third-party apps offering a GUI for Windows/Mac/Linux platforms: • pagina EPUB-Checker for Windows / Mac / Linux • ePub Checker for iPad/iPod/iPhone (iTunes Store App)


  • EPubCheck is a command line tool that can be run on any operating system (OS).
  • EPubCheck can be used as part of Java library.
  • Build tool require Java Development Kit JDK (1.6 or above)

Online version of EpubCheck


Check the release page on IDPF to get the latest distribution. EpubCheck 3.0.1 is the latest recommended version to validate both EPUB 2 and 3 files.


User Experiences

EPubCheck standard on Smashwors publishing

Self-publishing site, Smashwords, requires author to pass EPubCheck in order to get their publication to Apple Bookstore HOW TO FIX EPUBCHECK ERRORS

Development Activity

For tool updates and development, check https://github.com/IDPF/epubcheck


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