What is EPUB File Extension?


It is an e-book file extension. EPUB file format is now widely used to install and view online files on smart devices like tablet, computers, smartphones etc.

Many reputed software companies have used EPUB for their e-books. Google has launched Google Books for Android users which supports EPUB. iBooks on iOS is also using the same file extension.


EPUB files fall in the category of PDF.

Supported Apps

ePUB Reader is supported by the file extension.


The file extension is developed and maintained by International Digital Publishing Forum (IDPF).



Signature & Format

50 4B 03 04 0A 00 02 00 (PK......)

It supports the E-book format.

How to View or Open the EPUB File Extension

Users can use a free or paid tool to open the EPUB files.

Software like iBooks on iOS and Google Books support the file extension.