a WYSIWYG editor, you make the most of it using its advanced features (regex, clips, etc.). If you absolutely must use PDF, then be prepared for an output ranging anywhere from decent to unusable, depending on the input PDF. I researched Jutoh before I switched to Sigil and your eBook. To re-iterate PDF is a really, really bad format to use as input. PDFs that are used to display complex text, like right to left languages and math typesetting will not convert correctly In such cases calibre uses the OCRed text, which can be very different from what you see when you view the PDF file Some PDFs are made up of photographs of the page with OCRed text behind them. PDFs that use embedded non-unicode fonts to represent non-English characters will result in garbled output for those characters Links and Tables of Contents are not supported Conversion of these may or may not work depending on just how they are represented internally in the PDF. Some PDFs use special glyphs to represent ll or ff or fi, etc. To learn how to use the header and footer removal options, read All about using regular expressions in calibre.Ĭomplex, multi-column, and image based documents are not supported.Įxtraction of vector images and tables from within the document is also not supported. If the headers and footers are not removed from the text it can throw off the paragraph unwrapping. Use the Search and Replace panel to remove headers and footers to mitigate this issue. You can adjust this value in the conversion settings under PDF Input.Īlso, they often have headers and footers as part of the document that will become included with the text. Lower this value to include more text in the unwrapping. The default is 0.45, just under the median line length. Valid values are a decimal between 0 and 1. This is a scale used to determine the length at which a line should be unwrapped. calibre will try to unwrap paragraphs using a configurable, Line Un-Wrapping Factor. Meaning, it is very difficult to determine where one paragraph ends and another begins. They are a fixed page size and text placement format. PDF documents are one of the worst formats to convert from.
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