Online Grammar Checker - Best Grammar Checker

This free grammar checker finds grammar, spelling and punctuation mistakes in your text and suggests corrections you can apply with one click. It checks up to 20,000 characters at a time in 20 languages, including US, UK, Australian and Canadian English. Paste your text, click Check text, and click a suggestion to fix each mistake.

How to check grammar online

1. Choose the language. Pick your variety of English (or another language), or leave it on Auto-detect.
2. Paste or type your text into the box.
3. Click Check text.
4. Review the highlighted words. Each issue is underlined in your text and explained below it.
5. Click a suggestion to apply it, then copy your corrected text.

What the grammar checker catches

• Subject-verb agreement: "She go" → "She goes" or "She went".
• Spelling mistakes: "buyed" → "bought", "dont" → "don't".
• Articles: "a apple" → "an apple".
• Punctuation: missing or misplaced commas, spaces before punctuation and repeated punctuation marks.
• Style: repeated words, wordy phrases and capitalisation.

Underline colours tell you the type of issue: red for grammar, orange for spelling and blue for style suggestions.

Tips for getting the best results

• Choose the right variety of English, since spelling differs: "color" (US) versus "colour" (UK).
• Check long documents in sections of a few paragraphs, so the suggestions are easier to review.
• Read every suggestion before you accept it. Automated checkers can miss context. In the example above, "Their going" should be "They're going", and that was not flagged, so a final read-through still matters.
• Use the Punctuation Checker for comma-heavy text and the Readability Checker to see how easy your writing is to read.

Supported languages

English (US, UK, Australia and Canada), German, French, Spanish, Portuguese (Portugal and Brazil), Italian, Dutch, Polish, Russian, Ukrainian, Catalan, Swedish, Danish, Romanian, Slovak, Greek, Persian, Arabic, Japanese and Chinese. For German texts you can also use the dedicated German Grammar Checker.

Frequently asked questions

Is this grammar checker free?

Yes. It is free, needs no sign-up and works on desktop and mobile browsers.

Is my text stored?

Your text is sent to the LanguageTool service to be checked and is not stored by SEO Tools Centre. Avoid pasting passwords or other confidential information into any online checker.

How much text can I check at once?

Up to 20,000 characters, which is roughly 3,000 words. The character counter above the box shows how much you have used.

Does it check spelling as well as grammar?

Yes. It flags spelling mistakes, grammar errors, punctuation problems and some style issues in one pass.

Last updated: 7 October 2026