If I understand the 2 concepts of EPUB and PDF, it is that PDFs are fixed on the page and invariable to line length and EPUBs are not fixed to any particular page size, font size, or line length. EPUBs reflow as needed and PDFs are as invariable as printed paper. Also, it is very, very tough to start with a PDF and convert it to EPUB. It can be done and I frequently do it, but there is a lot of clean-up afterward. Best regards, Pop
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