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I'd like to find out why some epub documents will convert to the pdf format using the Calibre book conversion tool, with an output file size much larger than the the input document.

It's common for pdf output result's to be either 2 or 5 times the size of the input epub document, but I've also got one example where the pdf output remains the same size as the epub input, and all conversion settings where more or less the same.

If you'd need to see content examples to help troubleshoot, is there an approved method of sharing copyrighted material on this site, such as over direct message?

For reference: I'm using a 7.17 'portable' instance of Calibre (not too old) but don't see how that'd be the most likely cause, unless pdf file bloat was a known bug since addressed.