What types of errors does it detect?

Spelling mistakes, capitalization errors, repeated words, commonly confused words such as 'their' and 'there', and run-on sentences.

The current version focuses on fast rule-based checks for common writing mistakes. It is best for quick proofreading before you send or publish text.

Does it work with non-English text?

The rule-based engine currently focuses on English text, so results may be limited for other languages.

Can I apply all fixes at once?

Yes. Click the Apply All button to accept every suggestion in one step, or review them individually.

Is my text sent to a server?

No. All grammar and spelling checks run locally in your browser. Your text is never transmitted.

Free Grammar Checker – Fix Spelling & Grammar Errors Online

Paste your text and click “Check Grammar” to instantly find spelling mistakes, capitalization errors, repeated words, confused words, and more. Fix issues one by one or apply all suggestions at once with ToolMint. Tuned for quick English proofreading of emails, school work, blog drafts, and short-form website copy — no account needed.

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Best Uses for This Grammar Checker

Emails and messages

Catch obvious spelling and capitalization mistakes before sending client emails, support replies, or application messages.

Essays and assignments

Do a fast pass on student writing to spot repeated words, confused terms, and sentence-level issues before submission.

Website copy and captions

Clean up homepage text, product descriptions, blog intros, and social captions without leaving your browser.

How to Check Grammar Online

Paste your text

Type or paste the text you want to proofread.

Click Check Grammar

The tool scans for spelling, capitalization, repeated-word, and grammar issues.

Review suggestions

Each issue is highlighted with a suggestion you can accept or skip.

Apply fixes

Fix issues one by one or apply all suggestions at once, then copy the corrected text.

Most Common Grammar Mistakes in English Writing

The most frequently flagged issues in English writing fall into a handful of recurring patterns. Confused homophones — their/there/they're, your/you're, its/it's, affect/effect — account for a large share of errors in casual writing because spell-checkers pass them as correctly spelled words. Repeated words occur when editing leaves a duplicate term after a cut and paste — “the the” or “had had” — and are easy to miss in a normal read-through. Capitalization errors are common when pasting text from all-caps sources or when proper nouns are left lowercase. Run-on sentences join two independent clauses with only a comma instead of a conjunction or full stop. Subject-verb agreement errors (“the team are” vs. “the team is”) appear most often in longer sentences where the subject and verb are separated by a relative clause. This tool catches all of these categories in a single pass.

Rule-Based Checking vs. AI Grammar Checkers: What Is the Difference?

Rule-based grammar checkers apply a fixed set of linguistic rules to detect specific error patterns. They are fast, predictable, and work entirely in the browser without sending your text to any server. The trade-off is that they cannot interpret context — a confused homophone that is correctly spelled will pass most rule-based checks unless the tool has a curated list of common confusable word pairs. AI-based grammar checkers like Grammarly use language models to evaluate meaning and suggest rewrites, which catches subtler issues but requires uploading your text to a remote server. For quick proofreading of emails, blog posts, and short documents — especially when privacy matters — rule-based checking is faster and more suitable. For in-depth editing of long-form writing where tone and style matter, an AI tool adds more value. This tool is designed for the former use case: fast, private, and free.

Frequently Asked Questions

What types of errors does it detect?: Spelling mistakes, capitalization errors, repeated words, commonly confused words such as 'their' and 'there', and run-on sentences.
Is this AI-powered?: The current version focuses on fast rule-based checks for common writing mistakes. It is best for quick proofreading before you send or publish text.
Does it work with non-English text?: The rule-based engine currently focuses on English text, so results may be limited for other languages.
Can I apply all fixes at once?: Yes. Click the Apply All button to accept every suggestion in one step, or review them individually.
Is my text sent to a server?: No. All grammar and spelling checks run locally in your browser. Your text is never transmitted.

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