ePub is the term for the file format that is quickly becoming the international standard for ebooks. Currently there are two main types of ebook file formats that the world consumes for tablet reading: .mobi, which is a proprietary format to the Amazon Kindle ereading system, and secondly the .epub file, which can be rendered on any ereading app across devices and regardless of operating systems.

Ebooks published through the PubSoft system are distributed as epub files that can be read on any device and any operating system. The PubSoft system complies with the latest standards of the .epub format as set by the International Digital Publishing Forum (IDPF).