Diff Checker
Compare two texts side by side and highlight every added or removed line instantly.
- removed Lines present in the original but missing from the modified version.
+ added Lines present in the modified text but absent from the original.
Unchanged lines are shown with no highlight. The algorithm uses Longest Common Subsequence (LCS) — the same method used by git diff — for accurate line-level comparison.
🔒 Privacy: All comparison happens locally in your browser. Nothing is sent to any server.
About Diff Checker
Diff Checker compares two versions of any text side by side and highlights every line that was added or removed. Paste your original text on the left and the modified version on the right, then hit Compare. Removed lines are shown in red, added lines in green, and unchanged lines appear without highlight. Uses an LCS (Longest Common Subsequence) algorithm — the same method used by git diff — for accurate line-level comparison. Supports up to 500 lines per side. Useful for comparing code versions, reviewing document edits, and spotting changes between drafts. 100% client-side, no uploads, no tracking.