Calibre is the undisputed king of eBook management. It turns your hard drive into a professional-grade index.
The standard EPUB 3 specification supports page-list navigation, but most publishers treat it as an afterthought. Here is why the old model fails: index of epub books better
A common frustration with downloaded EPUBs is a broken Table of Contents (ToC). You click "Chapter 4," and it takes you to Chapter 3. Here is how to ensure the file structure is better. Calibre is the undisputed king of eBook management
Unlike PDFs, which are static images of pages, EPUBs allow you to change the font size, typeface, and margins. which are static images of pages