Paste two versions of anything and instantly see what changed — highlighted line by line and word by word, side-by-side or inline. Everything stays in your browser.
When two versions of something look almost identical, finding what actually changed by eye is slow and unreliable. This Diff Checker does it instantly: paste an original and a revised version, and every added, removed, and changed line is highlighted — right down to the individual words that differ within a changed line.
It runs entirely in your browser. Your text — a contract redline, a config change, an edited essay, a code snippet — is never uploaded or logged, so even sensitive comparisons stay private.
+ and - markers.Hello and hello as the same.No account, no upload — paste, compare, done.
Paste the original on one side and the revision on the other, and every change lights up: line-level for structure, word-level for the precise edits. Toggle side-by-side or inline view to taste.
Yes, and this is the classic use: paste both versions and see exactly which words changed between draft 3 and draft 4, before signing anything. Nothing is stored, which matters for sensitive documents.
Yes. Toggles for case and whitespace silence the noise so you only see meaningful edits, which is essential when comparing code or copy that was reformatted.
Yes. Word-level highlighting inside changed lines catches the one-character edits that matter in code, and locally-run comparison means proprietary source never leaves your machine.
No. The comparison runs in your browser with no history feature quietly keeping copies. Both texts vanish when you close the tab.