.EPUB File Extension
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 is a standard digital publication format publishers and consumers utilize to store the text of the book, chapter links, cover art, images, and more eBook elements. Supporting software programs and hardware devices, called e-readers, can view EPUB files.
The EPUB format is based on three open standards maintained by the International Digital Publishing Forum (IDPF). The standards are:
- The Open Publication Structure (OPS), which defines the content markup
- The Open Packaging Format (OPF), which describes the eBook structure
- 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. Only authorized devices can view the eBook if the eBook includes DRM information.
How to open an EPUB file
You can open an EPUB file and read the book it contains using the following ereader programs:
- Calibre (cross-platform)
- Apple Books (Mac, iOS)
- Adobe Digital Editions (Windows, Mac, iOS, Android)
- Aldiko (iOS, Android)
If you want to edit the book an EPUB file contains, you can do so using an eBook editor, such as Calibre.
How to convert an EPUB file
Calibre can convert EPUB files to various file types, including the following formats: