Text Diff Checker
Compare two versions of a text and instantly see what changed. The diff checker aligns the texts line by line using the same longest-common-subsequence approach as Git, highlighting additions in green and deletions in red, with a summary of how many lines were added and removed. Comparison runs entirely in your browser — safe for private documents and code.
Text Tools
Private by default
This tool runs entirely in your browser. Your data is never uploaded to a server.
How to use
3 clear steps.
Paste the original text on the left.
Paste the changed text on the right.
Click Compare to see additions and deletions highlighted line by line.
Good to know
Frequently asked questions
- How does the comparison work?
- It computes the longest common subsequence of lines between the two texts — the same core idea used by Git and classic diff tools — and marks everything outside it as added or removed.
- Is my text uploaded anywhere?
- No. The comparison runs entirely in your browser, so it's safe to diff contracts, code, or any private text.