Text Compare (Diff Checker)
Paste two versions of a text below to see a line-by-line comparison, with removed lines in red and added lines in green. Comparison runs locally — nothing is uploaded.
Frequently asked questions
How does the comparison work?
The tool computes a longest-common-subsequence diff over lines — the same core approach used by git and classic diff utilities — and marks lines present only in the first text as removed and lines only in the second as added.
Can I compare code with it?
Yes — line-based comparison works well for code, configuration files, and CSV extracts. For within-line character changes, the whole line is shown as removed and re-added.
Is there a size limit?
Very large inputs (beyond about 5,000 lines each) are declined to keep the comparison instant in the browser.