EPUB is a free and open ebook standard by the International Digital Publishing Forum (IDPF). EPUB is designed for reflowable content, meaning that the text display can be optimized for the particular display device. It supersedes the Open eBook standard. EPUB files have the extension .epub.
Here is the Our Web Service for PDF to Epub (Fixed Layout) Conversion for Free. It's good for complex fixed layout. It's really a different from other conversion services. Conversion is 100% error free and compatible with Ipad, Google Play Book.
Looks like the PDF
The best part of our web service is that it actually recreates the full PDF experience in epub3 - the text and images are converted with the look and feel of the original document preserved exactly.