
: Re: Converting pdf with table of content to Kindle format To convert the pdf using Calbre I use : Click 'Add Books' and add pdfs to library Save To Disk -> Save Only MOBI format to disk -Once
To answer your first question. The .opf file holds the metadata that Calibre extracts from the (PDF) file when adding it to Calibre, as well as that metadata that you decide to edit on (author, title, series, etc).
For some formats like ePub this metadata is almost taken verbatim and inserted in one of the files that are zipped into the ePub container. For other files like PDF this cannot all be stored in the original file and hence has to be stored separately.
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