PDF to ePub Converter for iPad/iBooks?

Everywhere confused and in English describing the sequence of actions when converting, here I found a less clear description of how to convert, for example, from PDF to MOBI you can choose any other format in the same caliber

The same Calibre in the network: www.2epub.com/

iBooks in iOS works fine with PDF.

In GoodReader there is content (go to Chapter) to PDF.

For converting PDF to ePub can use the following converters:

Program free, use