Take the 2-minute tour ×  I am self-publishing a free e-book
which I make available in several formats: EPUB, online HTML,
PDF.  I create (using my own programming scripts) EPUB and
online HTML from XHTML sources which I write by hand (in a text
editor). Then I also convert EPUB -> PDF using Calibre software.
My question: Except for PDF, which of the other file formats
supported by Calibre should I publish too? (For maximum
readership of my e-book, provided that some formats may be
probably rare and not worth supporting.)  share|improve this
question It'd be helpful to know more about the kind of book.
Mainstream fiction? Academic non-fiction? A memoir? –  Neil Fein
Apr 14 '13 at 23:10 @NeilFein: Religion. –  porton Apr 14 '13 at
23:12  4 Answers 4  According to these figures, 55% of ebook
buyers use the amazon kindle, regardless of their accuracy, the
kindle is a very popular device. The (non-drm) format which
works best with the kindle is the mobi. Pdf on the kindle is
sometimes unreliable.  All other popu