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What is an ePub file

The Open eBook Publication format (ePub) is a common format for electronic books. It was developed as a freely available standard for ebooks by the International Digital Publishing Forum (IDPF) in 1997. One of the main advantages of ePub is that the format is freely available. Therefore many eBooks use this format.

Furthermore, in contrast to the PDF format, it offers reflowable and resizeable text. It also includes raster and vector images and CSS styling.

Ebook readers which support ePub

Most of the common ebook readers support the epub format. Here the compability of various devices:
  • The B&N Nook
  • The Sony ebook reader
  • The Amazon Kindle does not support the ePub format. To read your ePub ebooks with this reader you have to convert them to the Mobi format or the PDF format (You can use our converter to do so)
  • If you want to read ePub files on other portable readers like iPad you can do so installing additional software. More information you find here...

DRM layers

Some ePub files may contain a additional DRM layer. DRM stands for Digital Rights Management and imposes a constraint on affected files to prevent them from being read by any software or on any portable device. For the moment there are competing standards which may cause confusion and problems to migrate ePub files between different reading systems. The most common standard is the Adobe Content Server which is supported by Adobe Digital Editions. However, there some more standards available like FairPlay or Lektz DRM.

Current version

The current version of the ePub format is ePub 3.0 and was introduced in 2011. It replaced ePub release 2.0.1 and brought some mayor improvements which are described on the IDPF webpage in more detail.