This month we’re showing you calibre. calibre is an “iTunes for e-books”. Electronic books can be organized and, much more importantly, converted to many formats. This way you can read all your e-books on any tablet or an iPad.
iBooks dictionary and highlight feature is only supported in “real ebooks”. Every PDF e-books has to be converted to ePUB â€” with calibre for example â€” before the features work.