.EPUB File Extension

.EPUB File Extension

Open eBook File

Developer IDPF
3.6  |  614 Votes
Category eBook Files
Format Zip

What is an EPUB file?

An EPUB file is a digital ebook saved in the EPUB format, an open XML-based format for digital books and publications. It provides a standard digital publication format for publishers and consumers. EPUB files can be viewed with supporting software programs and hardware devices, which are called ereaders.

More Information
Screenshot of a .epub file in Calibre 3.7
EPUB file open in Calibre 3.7

The EPUB format is based on three open standards, which are all maintained by the International Digital Publishing Forum (IDPF).

  1. The Open Publication Structure (OPS), which defines the content markup
  2. The Open Packaging Format (OPF), which describes the ebook structure
  3. The Open Container Format (OCF), which packages all the ebook files together in a compressed format

NOTE: Many commercial ebooks include digital rights management (DRM) protection. These files can be opened only on devices that have been authorized to view the ebook.

How to open an EPUB file

You can open an EPUB file and read the book it contains using the following ereader programs:

If you want to edit the book an EPUB file contains, you can do so using an ebook editor, such as Calibre.

Open and view .EPUB files with File Viewer Plus.Free Download

Programs that open or reference EPUB files

Updated January 18, 2022

Verified by FileInfo.com

The FileInfo.com team has independently researched the Open eBook file format and Mac, Windows, Linux, Android, and iOS apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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