The problem is that the original image of the text is "in front" of the actual digital text of the PDF. Figure 1: How layers are stacked in a PDF PDF is composed of overlapping visible and invisible layers. OCR attempts to use algorithms to identify text placement and size, then place text objects under the original images of the pages. See these ...


The current file extension is .kfx (According to Wikipedia this is "Kindle Format 10" )


PDFs are not designed to be converted from. They have no structure that allows Calibre to determine for sure how many columns of text it has or what's a footnote. The Calibre manual describes the topic in more depth. I found that copying the text to a text editor, cleaning it up and then pasting it into the Calibre e-book editor gives the best results but it ...

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