Comparing two versions of a document by eye means scanning both top to bottom and hoping nothing slips past you. This puts two texts side by side and highlights which lines were added, removed, or left alone: the same comparison a code diff gives you, applied to any plain text.
When you'd use this
Checking what moved between two drafts of a document, two exports of a config file, or two versions of a data file. Anywhere you want certainty about what changed instead of a guess from skimming.
Common errors
A diff showing far more changes than you expected usually comes down to whitespace or line endings. Trailing spaces, or \r\n against \n from different operating systems, register as differences even when the words on the line are identical. Worth ruling out before you conclude the content diverged that badly.
Frequently asked questions
Does this compare word-by-word or line-by-line?
Line by line. Each line is compared as a single unit, so one character changed inside a long line marks that entire line as different, without pinpointing the specific word or character that moved.
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