Diff Checker
Compare two blocks of text or code and see exactly what changed — added and removed lines highlighted, computed with a proper LCS diff.
Original
Changed
Frequently asked questions
How does the diff work?+
It runs a longest-common-subsequence (LCS) diff over the lines of both texts, so it finds the minimal set of added and removed lines — the same approach code tools use.
Can I compare code?+
Yes — paste any text or code into the two boxes. Additions are highlighted green, removals red, with +/− counts.
Is my text uploaded anywhere?+
No. The comparison runs entirely in your browser; nothing is sent or stored.
Want this built into your own software?
These free tools are a taste of what we do. Leave your details and our team will reach out — or build something like this into your systems.
Prefer to chat? Contact us