Why are some books only available in EPUB format and others only in PDF format? Why are they sometimes available in both formats? Which one should I choose?

Not all publishers sell books in both formats. Some books are only available in PDF or EPUB format, while others are available in both formats. Depending on what your library has purchased, a book may be available in only one format or both.

Usually, when both formats are available, it is better to choose the EPUB version. If you plan to read the book on a e-reader and it is only available in PDF, we suggest you choose another book, as PDF files can be difficult or even impossible to read on a e-reader due to the impossibility of resizing the characters.