Compare two versions of text and see exactly what changed, line by line.
Paste the original text on the left and the changed version on the right, then compare — lines that were removed are highlighted in red, lines that were added are highlighted in green, and unchanged lines are shown in between for context.
This tool finds the longest common subsequence of lines shared between the two texts, then reports
everything else as either removed (only in the original) or added (only in the new version) —
the same underlying approach used by git diff and most source-control tools, just
applied to any plain text rather than code specifically.
Useful for comparing two drafts of an article, spotting exactly what changed between two versions of a config file, checking what a co-worker edited in a document, or reviewing changes to a script or config that isn't in version control.