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.EPUB File Extension

File TypeOpen eBook File

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CategoryeBook Files

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 do I 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.

Programs that open EPUB files

Updated 4/28/2021

About EPUB Files

Our goal is to help you understand what a file with a *.epub suffix is and how to open it.

The Open eBook file type, file format description, and Mac, Windows, Linux, Android, and iOS programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

If you would like to suggest any additions or updates to this page, please let us know.