Diff Checker
Compare two texts and see exactly what changed — added and removed lines highlighted, in your browser.
How to use
- Paste the original text on the left and the changed text on the right.
- It highlights removed lines in orange and added lines in green, automatically.
- Toggle the ignore options if small spacing or case differences are getting in the way.
FAQ
Is my text uploaded anywhere?
No. Both texts are compared entirely in your browser. Nothing is uploaded, so it works offline and stays private — safe for code, contracts or anything sensitive.
How does the comparison work?
It compares line by line using a “longest common subsequence” algorithm — the same idea behind developer diff tools — so unchanged lines line up and only the real additions and removals are flagged.
What do the ignore options do?
“Ignore leading/trailing spaces” treats lines that differ only by indentation as the same; “Ignore case” treats upper- and lower-case as identical. Both reduce noise when you only care about meaningful changes.