
: Re: How to create clickable table of contents in a PDF? I have many technical PDF ebooks where there are no chapters (no clickable table of contents or other means for quick navigation through
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For 'software-generated' PDF-files, i.e. PDF's not created from scans, I recommend to use (and upvote the answer by Krasjet) pdf.tocgen. Using this package becomes even easier with the toc-mode package for (Spac)Emacs described next.
For all other PDF and DJVU documents there is a new package called toc-mode for Emacs, which in my opinion provides the easiest way to add Table of Contents to documents (for linux and possibly also for different OS's). It includes options to extract the TOC via OCR.
In case this package's functionality is not sufficient or using Emacs is no option then the remaining part of this answer remains valid.
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(Not enough reputation points to comment) Like the answer by Patrick Bourdon, I would also recommend HandyOutliner (http://handyoutlinerfo.sourceforge.net/). However, I would suggest you try the python script called document-contents-extractor to extract the contents.
If these options do not work, then I would also like to recommend PDF-XChange Viewer as a very powerful bookmark/contents extractor (selected text can be easily added to the bookmarks). It works well under wine.
Although not related to the question, I just would like to add that at the moment PDF X-Change viewer appears to me to be the most powerful PDF editor/viewer on linux. (although Emacs's amazing PDF-tools and Zathura are my favorite PDF editor and viewer respectively).
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