Diff Checker
Compare two texts and see what changed — line by line
Added
Removed
Unchanged
How the Diff Checker Works
Paste the original text on the left and the modified version on the right, then click Compare. The diff is computed line by line using the Longest Common Subsequence (LCS) algorithm — the same method used by tools like Git.
Reading the Output
- + Green lines — Lines present in the Modified text but not in the Original (added).
- - Red lines — Lines present in the Original but removed in the Modified version.
- Gray lines — Lines unchanged between both versions.
All comparison happens locally in your browser — neither text is uploaded to any server.