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Comparing two versions of a document by eye means scanning both top to bottom hoping nothing slips past you. This puts two texts side by side and highlights exactly which lines were added, removed, or left unchanged - the same kind of comparison a code diff gives you, applied to any plain text.
When you'd use this
Checking what actually changed between two drafts of a document, two exports of a config file, or two versions of a data file - anywhere you need certainty about what changed, not just a guess from skimming.
Common errors
A diff that shows far more changes than expected often means whitespace or line-ending differences (trailing spaces, or \r\n vs \n from different operating systems) rather than actual content changes - worth checking before assuming the content itself diverged that much.
Frequently asked questions
Does this compare word-by-word or line-by-line?
Line by line - each line is compared as a unit, so a single character changed within a long line marks that whole line as different, rather than highlighting just the changed word or character within it.
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