Text difference checker
Compare original and modified text line by line, showing insertions and deletions in a bounded local worker.
How to use
Paste the original and modified text and compare. Lines beginning with + are inserted, − deleted, and a space unchanged. Cancel the job or clear the texts when finished.
Comparing lines A then B against A then C shows unchanged A, deleted B and inserted C.
Support & limits
The tool uses a longest common subsequence of lines (LCS), preferring deletion when paths tie. CR and CRLF normalize to LF before comparison. ⟦EOF⟧ marks a line without a final newline; input fields remain unchanged. The worker terminates on cancellation, timeout or completion.
Common questions
Why is a complete line shown instead of one highlighted word?
This is literal line comparison: a change within a line deletes the old line and inserts the new one. Whitespace and letter case are significant; the result does not measure semantic similarity.