How it works
Online Text Diff Checker
Paste original and changed text, choose optional whitespace or letter-case rules, then select Find Differences. Results move above the editors with added, removed, and unchanged counts, unified or split views, Previous and Next navigation, and a patch-copy action. Edit either source and the result is marked as outdated until you compare again. A Web Worker keeps larger comparisons away from the interface thread, and all content remains in your browser.