Text Diff Checker

Text diffing identifies the differences between two versions of a document. The algorithm finds the longest common subsequence and marks everything else as additions (in the new version) or deletions (from the old version). This is the same core algorithm used by version control systems like Git.

This tool compares two text inputs at the line and character level, showing a side-by-side or unified diff view with color-coded highlights. It is useful for reviewing code changes, comparing configuration files, checking document revisions, or verifying that a transformation produced the expected output.