Free Grammar Checker Online

The Grammar Checker is a free AI-powered tool that identifies and corrects grammar, spelling, and punctuation errors in your writing.

Yes, the Grammar Checker is free to use with no registration required.

The Grammar Checker detects spelling mistakes, grammatical errors, punctuation issues, and style inconsistencies to help you write more clearly.

Absolutely. The Grammar Checker processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Grammar Checker is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Grammar Checker in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Grammar Checker works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

These are four distinct categories the checker sorts issues into so you can scan them quickly. Spelling errors are misspelled words and missing apostrophes, like "recieve" or "dont." Grammar errors are faulty constructions and confused word pairs, such as their/there/they're, its/it's, or "could of" where "could have" is meant. Punctuation errors cover missing end-of-sentence periods, doubled spaces, and bad spacing around marks. Style issues are not strictly wrong but weaken your writing: redundant phrasing like "very unique," passive-voice constructions, and overused adverbs. Each flagged item is labelled by category and severity (error, warning, or suggestion) so you know which problems must be fixed and which are optional polish. Errors are the ones that genuinely undermine credibility, while suggestions are advisory. Paste your text above to see every issue grouped this way, each with a plain-language explanation of the rule behind it and the surrounding context.

The Flesch Reading Ease score runs from 0 to 100, and higher means easier to read. A score of 60 to 69 is rated "Standard" and roughly matches an 8th-to-9th-grade reading level, which is a sensible target for most web content, emails, and general articles. Scores of 70 and above read plainly and suit a broad audience, while scores below 50 signal dense prose that may lose casual readers. The number is calculated from your average sentence length and syllables per word, so shortening sentences and choosing simpler words raises it. The tool also reports a Flesch-Kincaid grade level alongside it so you can target a specific audience, and it updates in real time as you edit. There is no single correct number; aim lower for a general audience and higher only when writing for specialists. Paste your text above to see both readability scores instantly and adjust your sentences until they hit your target.

Passive voice and adverbs are labelled as suggestions, not errors, because they are grammatically correct but often weaken clarity. Passive constructions like "the report was written by the team" hide who did the action and read less directly than "the team wrote the report," so the checker counts them and shows the percentage of your sentences affected. Overused -ly adverbs such as "really," "very," and "basically" frequently signal telling rather than showing, and trimming them tightens your prose. These flags are advisory: you can apply them, ignore them, or leave them as is, since some passive voice and the occasional adverb are perfectly fine. The style report also shows your average sentence length and how much it varies, since mixing short and long sentences reads more naturally. Use the breakdown above to spot patterns, then decide case by case which sentences genuinely benefit from a rewrite.

This checker uses rule-based pattern matching against a dictionary of around 500 common misspellings and about 20 grammar, punctuation, and style rules, rather than sending your text to a remote language model. That design is deliberately conservative: it reliably catches well-defined, frequent mistakes instead of guessing at every nuance of meaning, which means very few false alarms but it will not interpret tone or rewrite awkward phrasing the way a large AI model might. The trade-off is speed and privacy, because everything runs instantly in your browser with nothing uploaded. For everyday proofreading, removing the obvious errors that undermine credibility, it is dependable. For deep stylistic rewriting you may still want a human read. Paste your draft above to clear the common errors first, then review anything the rules cannot judge.

When the tool marks a word that is actually correct, like a person's name, a brand, or technical jargon, you can add it to a personal dictionary so it is ignored from then on. Click the flagged word to open its detail panel, then choose "Add to Dictionary," and it will no longer appear as a spelling issue on this or future checks. That custom word list is saved in your browser's local storage, so it persists between visits without any account or sign-up, and you can remove words from it later if you change your mind. This keeps your results focused on genuine mistakes instead of cluttering them with false positives. Paste your text above, build up your personal dictionary as you go, and each check will get cleaner and more relevant to your own vocabulary.