AI Grammar Checker

Paste your text into the box, or use URL mode to fetch a webpage, or Upload mode for a PDF or .txt file. Pick your English variant (US, UK, CA, or AU) and a target tone (Formal, Casual, Academic, or Business), then click Check Grammar. You get a 100-point Document Quality Score with a letter grade and seven sub-scores: Grammar, Spelling, Punctuation, Clarity, Style, Tone, and Readability. You also get a fully corrected version of your text. Each flagged issue gets its own card with a severity (high, medium, or low) and a plain-English explanation of the rule.

They are different tools for different jobs. Grammarly is a real-time editor plugin with strong rule-based detection of common mistakes. ChatGPT is a general AI chat tool. It can check grammar on request, but it gives no consistent severity grading or rule explanations. This tool also uses a large language model for the audit. The difference is that it wraps the output in the structure Grammarly users expect. You get scored sub-categories, findings graded by severity, rule explanations, and a one-click corrected-text panel. It is free, with no signup.

None is perfect. AI grammar checkers, such as this tool and Grammarly Premium, are strongest on issues that depend on context: subject-verb agreement across long sentences, comma splices, and tone consistency. Rule-based checkers, such as LanguageTool and classic Grammarly, are strongest on mechanical errors like spelling and standard punctuation. Both can flag a valid sentence as a problem, so review each suggestion before you apply it. For high-stakes writing, pair any checker with a human review.

Yes. The Corrected text panel shows your input with every flagged fix already applied. Toggle "Show original" to see your draft, then toggle back. Copy the corrected text with one click. The AI also writes a card for each finding that explains what changed and why. That lets you learn from the corrections instead of accepting them blindly, which helps non-native writers and anyone who wants to improve over time.

• Subject-verb disagreement, especially when a long phrase separates the subject from the verb.
• Comma splices: two full clauses joined by a comma instead of a semicolon or period.
• Run-on sentences: ideas that should be split into several sentences.
• Misplaced modifiers, where the describing phrase is not next to the thing it describes.
• Overuse of passive voice, flagged when active voice would be clearer.
• Wordiness: phrases that can be shortened without losing meaning ("due to the fact that" becomes "because").
• Homophone confusion: their, there, and they're; your and you're; its and it's.
• Inconsistent tense: switching between past and present without reason.

Yes. There is no signup, no credit card, and no trial countdown. Each audit uses part of a daily AI token budget that is shared by every AI tool on the site. On the Free plan that budget is 50,000 tokens a day. For most people the Free plan covers their daily checking. Paid plans are for heavier users, such as content teams and students doing daily work. No feature sits behind a paywall.

A 100-point score that sums up the audit across seven sub-categories: Grammar, Spelling, Punctuation, Clarity, Style, Tone, and Readability. Each sub-category has its own 0 to 100 score, shown as a ring next to the overall grade. The overall score is the AI's judgement of the whole piece, not an average of the sub-scores. So it can sit above the weakest sub-score when the writing still works as a whole, or below when the sub-scores look fine but the piece does not hang together.

On the Free plan each submission can be up to 1,000 words. The cap exists because the audit repeats your input in its corrected text, so the limit is the AI's output size, not its input size. Text over the cap is cut at a word boundary, and a banner shows how much was dropped. Split a long document into chapters or sections and audit each one on its own.