Diff Checker
Paste two texts and see exactly what lines were added, removed, or unchanged.
About this tool
A diff checker compares two texts line by line and highlights what was added, removed, or unchanged. It uses the Longest Common Subsequence (LCS) algorithm - the same fundamental approach used by git diff. LCS finds the largest set of lines that appear in both texts in the same order, then marks the rest as additions or deletions. Useful for comparing code versions, document revisions, configuration files, or any structured text.