Text Diff Checker
Compare two blocks of text and see exactly what changed — updates automatically as you type. Runs entirely in your browser.
How it works
The comparison runs entirely in your browser using a standard text-diffing algorithm and updates automatically as you type. Word-by-word mode highlights individual word changes within otherwise similar text; line-by-line mode is better for comparing structured content like code or lists, and also offers a side-by-side view.
Frequently asked questions
What's the difference between word-by-word and line-by-line comparison?
Word-by-word highlights individual changed words within otherwise similar sentences, which suits prose. Line-by-line treats each line as a unit and is better for code, lists, or other structured text.
Is my text uploaded anywhere?
No — the comparison runs entirely in your browser. Neither text is sent to a server.