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Diff checker guides
Three short reads: why this matters, how to do it, and one specific way to use it.
Why You Should Diff Two Texts Instead of Reading Them Side by Side
Two paragraphs that look identical at a glance can differ by one flipped word, one deleted 'not', one changed number. Human eyes are bad at catching exactly that kind of change - a real diff isn't.
Read the guideHow to Compare Two Blocks of Text and See Exactly What Changed
Paste the original, paste the changed version, and the difference highlights live - no click required. Here's the actual process, including what the tool does when two texts turn out to be almost entirely different.
Read the guideLine Diff vs Word Diff: Comparing Config Files and Comparing Paragraphs
A config file and a paragraph of prose need two different kinds of diff. Line mode tells you which lines changed. Word mode tells you which words changed inside a line that's otherwise the same.
Read the guide