Punctuation Checker

Yes. No sign-up, no character limits, no paywall, no ads, no watermarks. Every feature on the page is free, and everything runs in your browser without an account.

No. This is a deterministic regex and heuristic-based checker. We never call an AI model, we never send your text to a server, and the same input always produces the same output. If you're looking for a punctuation checker with no AI, this is it.

No. All analysis happens locally in JavaScript running on your device. Your text is never transmitted, logged, or stored anywhere unless you choose to explicitly save a document to your account (requires sign-in).

A comma splice is when two independent clauses (complete sentences) are joined with only a comma, like 'I went home, it was late.' The fix is usually to replace the comma with a period, a semicolon, or a conjunction. Our tool flags the common pattern but leaves the fix to you since it depends on intent.

A run-on (or fused) sentence has two independent clauses joined without any punctuation or conjunction, like 'I went home it was late.' In practice, most punctuation checkers detect the comma-splice variant more reliably than the truly punctuation-free fused form. If a sentence feels like it's running on, try breaking it at a natural pause.

Grammarly and QuillBot are AI-powered grammar checkers — they can rephrase sentences, catch context-dependent errors, and offer style suggestions. They also require a sign-up, have usage limits on free tiers, and send your text to their servers. Our tool is the opposite: we only handle punctuation mechanics, but we do it instantly, privately, and without any limits or accounts.

No — this tool is focused specifically on punctuation (spacing, commas, periods, apostrophes, quotes, capitalization). For subject-verb agreement, tense consistency, and word choice issues, you'll want a dedicated grammar checker or a human editor.

Yes — copy your text from any source (Google Docs, Word, PDF, email) and paste it here. The tool handles curly quotes, non-breaking spaces, and other artifacts that typically come from Word. Hit Fix All, then paste the cleaned text back.

Not directly — we rely on your browser's built-in spell-check (the red underlines). Our tool focuses on punctuation and mechanical errors that spell-check misses. For a dedicated spell checker, browser spellcheck combined with this tool is a strong pair.

Yes — press Ctrl+Z (Cmd+Z on Mac) in the textarea to undo. The textarea preserves browser-native undo history so you can step back through any auto-fix applied.

The tool auto-detects common contractions missing their apostrophe — dont, cant, wont, isnt, wasnt, didnt, doesnt, havent, hasnt, hadnt, wouldnt, couldnt, shouldnt, arent, werent, youre, youve, youll, youd, theyre, theyll, theyd, theyve, whos, whats, thats. It deliberately skips context-sensitive cases like 'its' and 'were' to avoid false positives.

Yes. It flags lines where the count of straight double quotes is odd (suggesting an unmatched quote), and lines where straight and curly quotes are mixed. Manual review is required — the tool won't guess which quote style you prefer.