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For gratis solutions, you will get the best coverage from the following three applications, which can all convert many different file formats to PDF, and will work on Windows/Linux(/macos?). LibreOffice : office files/text files https://stackoverflow.com/a/30465397/3761687 ImageMagick : image formats https://imagemagick.org/script/command-line-processing.php ...


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I have come across another post on askubuntu that's also looking for a calibre alternative. The accepted answer on that post basically suggests using calibres internal command line tool: The Calibre install provides the command ebook-convert that will handle what you want, and there's no need to run Calibre. ebook-convert file.pdf file.epub The original ...


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As from the question it seems that you have access to the original LaTeX information I would recommend converting from the LaTeX rather than the pdf format. This can be done with a number of tools, one of which is the python pylatexenc library which includes a LaTeX to text conversion tool that is usable both programmatically and from the command line. An ...


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I've noticed one of the resources you listed is the LEADTOOLS SDK. (Disclosure: I'm a LEADTOOLS employee). Converting to the ePub file format from an input PDF can be done through the use of the DocumentConverter as you have listed https://www.leadtools.com/help/sdk/v21/dh/doxc/documentconverter.html To test this in Android code, you can try the following: ...


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