EPUB (from Wikipedia) (short for electronic publication; alternatively capitalized as ePub, ePUB, EPub, or epub, with "EPUB" preferred by the vendor) is a free and open e-book standard by the International Digital Publishing Forum (IDPF). Files have the extension .epub.

You can read more about this format:



Helpinator allows you to create EPUB books with one mouse click. All you have to do is:

1. Select template for this format in project options.

2. Install one of the available EPUB viewers to preview compiled ebook. For example you can use CoolReader:


HTML Templates for EPUB/MOBI formats are different from those used in CHM/WebHelp/QtHelp/JavaHelp. Though they too have <templatename.html> and <templatename.css> files, their logical structure is different:

  1. Default HTML file defines how a book page looks like.

  2. There are 2 additional HTML files: front.html and toc.html, the first for "front page" with title, author and etc and the second is for the table of contents.

  3. Default CSS file is for all 3 template HTML files.