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AI Grammar Checker

Fix grammar, spelling & punctuation with clear explanations

Also available as a Chrome extension — 5 tools in your right-click menu. Install Free →

Smart corrections Free, no signup
Input
0 words
Corrected

Grammar results appear here

Paste text and click Check Grammar

Free to try · No signup required

AI
Powered analysis
20K
Chars per check
Free
No signup
Why
Explanations

How It Works

1

Paste your text

Copy and paste any text you want to check — essays, emails, reports, blog posts, or messages. Works with any English text.

2

AI analysis

Our AI scans for grammar, spelling, punctuation issues. Each issue gets a clear explanation of why it was changed.

3

Review & apply

Get corrected text ready to copy, plus detailed issue list with original, correction, and explanation for each.

Use Cases

Students

Students & academics

Polish essays, research papers, and assignments before submission. Catch embarrassing typos and grammatical errors spell checkers miss.

Business

Professional emails

Ensure your business communications are error-free. A single grammar mistake in a client email can undermine your credibility.

Creators

Content creators

Check blog posts, social media copy, and marketing content before publishing. Clean writing builds trust with your audience.

Learners

Non-native speakers

Learn from detailed explanations of each correction. Understand why a change was made to improve your English writing over time.

Students also use

AI Humanizer Make AI text sound natural and bypass detectors → AI Rewriter Paraphrase text in 8 different writing modes → Email Writer Generate professional emails in seconds → Chrome Extension 5 AI tools in your right-click menu →

FAQ

How accurate is the AI Grammar Checker?
Our grammar checker uses AI language models to detect a wide range of errors including subject-verb agreement, tense consistency, punctuation, and spelling. It catches most common mistakes, but we recommend reviewing suggestions before applying them, especially for specialized or technical writing.
What languages are supported?
Currently the grammar checker is optimized for English text. It works well with both American and British English. Support for additional languages is planned for future updates.
Is my text stored or shared?
No. Your text is sent to our API for processing and discarded immediately after. We do not store, log, or share any text you submit. Your privacy is fully protected.
Can it fix style and tone issues?
The grammar checker focuses on grammar, spelling, and punctuation errors. For style and tone adjustments, try our AI Rewriter which offers 8 different writing modes including formal, casual, and academic.
Is there a word limit?
You can check up to 20,000 characters per submission. For longer documents, split the text into sections and check each one individually. Free users get generous daily usage.
How does this compare to Grammarly?
Coda One's grammar checker uses the same class of AI language models but is completely free with no signup required. Grammarly requires an account and limits features on the free tier. Our tool provides clear explanations for each correction so you understand why a change was made — not just what to fix. For full style rewrites, pair it with our AI Rewriter.
Does it understand context, or just check rules?
It understands context. For example, it distinguishes between "their," "there," and "they're" based on sentence meaning, not just pattern matching. It also handles complex cases like subject-verb agreement across long sentences and tense consistency within a paragraph.
Can I use it for non-native English writing?
Absolutely. Non-native speakers find it especially useful because each correction comes with an explanation — you learn why a phrase is wrong, not just what the correct version looks like. This makes it a learning tool as well as a proofreading tool. It handles both formal academic writing and everyday conversational English.
Is it really free?
Yes. You get 3 free uses per day with up to 300 words each. The AI Detector is completely free and unlimited. No credit card or signup required.
Do I need to create an account?
No. All tools work without creating an account. Sign up only if you want to track usage history or upgrade to a paid plan.
Can I pay with cryptocurrency?
Yes. We accept USDT, USDC, BTC, ETH, and other cryptocurrencies. No credit card or bank account needed. Plans start at $9.99/month.
Is it safe for academic use?
Our tools help you improve your writing. Always follow your institution's AI usage policy. The humanizer preserves your arguments and facts while making text sound more natural.
Does it work on mobile?
Yes. All web tools work in mobile browsers. For desktop, you can also use our Chrome extension for right-click access.
Is there a Chrome extension?
Yes. Our free Chrome extension includes AI Humanizer, Grammar Checker, AI Detector, Translator, and Word Counter — all accessible via right-click on any website.
How does this compare to Grammarly?
Both fix grammar and spelling. Coda One is free to use without signup, offers cryptocurrency payment for upgrades, and includes 67 other tools. Grammarly requires an account and starts at $12/month for premium features.

Coda One's AI Grammar Checker analyzes your text for grammar, spelling, and punctuation errors using advanced AI models. Get a corrected version of your text along with detailed explanations for each issue found. Works with essays, emails, blog posts, and any English text. Free to try, no signup required.

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