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