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Diff Checker

Compare two code snippets side by side and highlight differences line by line.

Original Code

Modified Code

How to Use This Code Diff Checker

Compare two code snippets side by side and see the differences highlighted. Uses an LCS-based algorithm for accurate line-by-line comparison.

Paste the original code in the left textarea
Paste the modified code in the right textarea
Click "Compare" to see the differences
Green lines are additions, red lines are removals

FAQ

What algorithm is used for diffing?

This tool uses a Longest Common Subsequence (LCS) based algorithm to compute line-by-line differences between the two code snippets.

What do the colors mean?

Green (+) indicates lines that were added in the modified version. Red (-) indicates lines that were removed from the original version. Unmarked lines are unchanged.

Is my code safe?

Yes. All comparison happens entirely in your browser. Your code is never sent to any server.