Unified: single column with - deletions, + additions, ~ changes.
Side-by-side: original on the left, changed on the right; aligned by the algorithm.
Algorithm: LCS (longest common subsequence) on lines; optional word-level pass on changed lines.
Colors: green = added, red = removed, amber = changed; grey = equal lines.
Files: drag & drop onto either text area or use file pickers.
Export: "Download .patch" saves the visible textual diff (not a full unified diff with headers).
Privacy: everything is computed in-browser; no data is uploaded.
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