Free AI Grammar Checker

You paste text. We identify grammar errors, punctuation mistakes, spelling issues, and awkward phrasing, then suggest corrections with explanations. That's the whole job.

Most grammar checkers highlight errors and leave the correction to you. Some correct automatically and leave you wondering what changed and why. Ours does both: it makes the correction and explains the rule so you understand what was wrong, which helps you avoid the same mistake in future writing.

The tool covers the errors that matter most in professional and academic contexts. Subject-verb agreement failures that read as careless. Comma splices that experienced readers catch immediately. Apostrophe errors that undermine credibility. Passive constructions that weaken argumentation. Run-on sentences that lose the reader. Dangling modifiers that change meaning unintentionally.

It also catches the errors grammar checkers traditionally miss. Contextual spelling errors — 'their' versus 'there' versus 'they're', 'affect' versus 'effect', 'complement' versus 'compliment' — where the word is spelled correctly but used wrong. Word choice issues where a word is technically correct but the connotation is off for the context. Tense inconsistencies within paragraphs that disrupt flow.

The result is cleaner writing with fewer errors and, over time, better writing because the explanations build awareness of the rules you're applying.

Paste your text into the input box. Paragraph, email, essay, or full document — any length works. Longer inputs take a few extra seconds.

Select a checking mode. Standard checks for all error types. Professional tightens the check for formal writing, flagging passive voice, wordiness, and corporate jargon that a standard check ignores. Academic mode adds checks for academic writing conventions, sentence variety, and transition quality. ESL mode is calibrated for common non-native English error patterns — article usage, preposition choice, verb tense selection, and word order issues that native speakers rarely make.

Click Check. The output shows your corrected text with tracked changes or a clean corrected version depending on your preference, plus a list of identified issues with explanations. Read the explanations, not just the corrections. Understanding why a comma splice is wrong or why the passive voice weakens your argument makes the corrections more memorable.

For long documents, check in sections. Paste 500 to 800 words at a time for more focused feedback and more specific explanations per error.

• Catches Contextual Errors: Identifies their/there/they're, affect/effect, and similar errors basic spell-checkers miss.
• Four Checking Modes: Standard, Professional, Academic, and ESL modes calibrated for different writing contexts.
• Explanations With Corrections: Every correction includes an explanation of the rule, not just the fix.
• Covers Passive Voice and Wordiness: Flags style issues beyond just grammatical errors.
• Works on Any Text Length: Paragraph to full document, no per-word limits.
• Faster Than Manual Proofreading: Complete grammar check in seconds versus 15 to 30 minutes per 1,000 words.
• Free Forever: No subscription or per-document charges.

• Four Mode Presets: Standard, Professional, Academic, and ESL modes for different writing contexts.
• Contextual Spelling Checks: Catches homophones and commonly confused words in context.
• Rule Explanations: Every correction includes the grammatical rule behind it.
• Passive Voice Detection: Identifies passive constructions and suggests active alternatives.
• Wordiness Flagging: Professional and Academic modes flag unnecessary filler phrases.
• Real-Time Processing: Results in under 10 seconds for most inputs.
• No Signup Required: Immediate access without account creation.
• Free Unlimited Use: No daily check limits or premium tier.

Grammar matters in ways that feel unfair but are real. Studies consistently show that written communication with grammatical errors reduces perceived competence, trustworthiness, and professionalism of the author — even when the content is otherwise strong. A well-researched report with subject-verb agreement failures looks less credible. A strong cover letter with apostrophe errors looks less professional. A client email with comma splices suggests carelessness.

The judgment is subconscious and quick. Readers don't stop to catalogue errors. They form impressions within the first few sentences and carry those impressions through the rest of the document. A clean opening paragraph sets a high expectation. An error-riddled opening sets a low one.

For non-native English writers, the challenge is compounded. Native speakers have implicit grammar knowledge from years of reading and speaking. They often catch errors by feel — the sentence 'sounds wrong' — without being able to articulate the rule. Non-native writers often have strong explicit grammar knowledge but miss the feel-based errors that native speakers catch automatically. ESL mode targets exactly these differences.

Professional writing standards rose in 2025 and 2026 partly because written communication volume increased. More email, more Slack, more documentation, more LinkedIn, more customer-facing chat. More opportunities for errors to be seen by colleagues, managers, and clients. And more competition for positions where writing quality is visible in applications and portfolios.

Systematic grammar checking before sending any professional document is simply good practice. The tool makes it fast enough to be practical.

• Students Submitting Academic Work: Undergraduates and graduate students checking essays, research papers, and dissertations for grammar errors before submission.
• ESL and International Writers: Non-native English speakers in professional or academic settings who need calibrated feedback on their most common error patterns.
• Professionals Writing Client Communications: Consultants, account managers, and service professionals whose writing quality directly affects client relationships.
• Job Seekers: Anyone submitting cover letters, emails, and LinkedIn profiles where grammar errors create instant credibility problems.
• Content Writers and Bloggers: Anyone publishing written content that reflects on their professional reputation.
• Managers Writing Reports: Professionals producing internal reports, memos, and documentation where errors undermine the professionalism of the work.