Paste two versions of a text file, config, or SQL query and see exactly which lines were added, removed, or unchanged.
Runs fully in your browser · nothing is sent anywhere
Original
Changed
Diff
Paste two versions above and click Compare.
How it works
Uses a standard LCS (longest common subsequence) line diff — the same class of algorithm behind diff/git diff — not a heuristic approximation.
Diffing is line-level only; it doesn't highlight the specific changed word/character within a modified line, only that the line differs.
"Ignore whitespace" and "ignore case" only affect which lines are considered equal — the diff view still shows your original text exactly as typed.
Capped at 4,000 lines per side to keep the browser responsive — the underlying algorithm is O(n·m), so very large inputs would freeze the tab rather than fail gracefully without this limit.