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The two answers disagree more often than you would think, which is why both are here. The words catch a figure edited from 41,250 to 41,520 on a page that barely moves. The pixels catch a moved logo, a swapped signature or a reflowed paragraph — none of which a text comparison counts as a change at all.

What comes back is a report: a summary sheet, then every changed page with the differences boxed. Neither of your files is altered, and neither leaves this browser.