Almost all of eBooks Reader supported the ePub format. which is a popular ebooks format. It can auto fixed page size in varied screen of varied device. But PDF can not do it.
Input Formats: AZW4, CHM, Comic, DJVU, DOCX, EPUB, FB2, HTLZ, HTML, LIT, LRF, MOBI, ODT, PDB, PDF, PML, RB, RTF, SNB, TCR, TXT
Output Formats: EPUB