Text Diff Checker
Compare two blocks of text and see added and removed lines side by side.
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Frequently asked questions
It compares the two texts line by line using a longest-common-subsequence diff. Lines that appear in both, in the same order, are marked unchanged; lines only in the original are marked removed; lines only in the changed text are marked added.
Yes. Windows (CRLF), classic Mac (CR), and Unix (LF) line endings are normalized before comparison, so the same text with different line endings is treated as identical.
No. The diff is computed entirely in your browser with JavaScript. Nothing you paste is uploaded, logged, or stored.
Last updated 2026-06-20.