Originally Posted by paultakeda
If your PDFs are DRM-free I'd convert them to ePub using something like Calibre. You'll lose the page formatting so if there are diagrams and columns it'll all go away, but as I mentioned in another thread, PDFs are designed to represent exact layout as specified by the creator and should not be mutable. That defeats the intent of a PDF and is the reason why PDF viewing on small screens is a hassle (the DX has a large enough screen that a PDF's typical letter-sized page sizes well on it).
Just for the sake of clarity:
The Calibre PDF-to-ePub converter is so rudimentary that the Calibre User Guide practically advises the user not to bother. Not in so many words, of course, but...
This is not the fault of Calibre (which is a gift from the gods to us lowly mortals), but it does bear mentioning.