The answer highly depends on the nature of your PDFs and the result you want!

There is no simple answer for this general question, because a pure print format and a flowing format are different by nature.

Even simple cases would need heuristics, but general solutions sophisticated artificial intelligence.

This post lists some possibilities (especially pdftohtml -xml) and other corresponding discussions:

Parsing PDFs by text position?

Cheers Rolf

In reply to Re: Need Help for Convert PDF to HTML by LanX
in thread Need Help for Convert PDF to HTML by satzbu

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