English Grammar Checker (AI) – Free & Accurate
AI-powered tool to check and improve English grammar instantly.
How to Use
- Paste text into the box
- Select a language for explanations
- Click “Check Grammar” for instant results
🔒 Privacy-first – text not stored.
Frequently Asked Questions
What is an English grammar checker?
An English grammar checker is an AI-powered tool that instantly finds and fixes grammar, spelling, and punctuation mistakes.
Is this tool free?
Yes. It’s completely free and requires no signup.
Is it privacy-safe?
Yes. Privacy-first design — your text isn’t stored.
Common English Grammar Mistakes and How to Fix Them
English grammar can be tricky even for native speakers. Whether you are writing an essay, a professional email, or a social media post, small errors can undermine your credibility. Our AI grammar checker catches all of the most common mistakes instantly.
1. Subject-Verb Agreement
The verb must match its subject in number. Singular subjects take singular verbs; plural subjects take plural verbs.
- ❌ He don't know the answer. → ✅ He doesn't know the answer.
- ❌ The team are playing well. → ✅ The team is playing well.
2. Wrong Verb Tense
English has 12 tenses. Mixing past simple with present perfect is one of the most common errors.
- ❌ I have went to the store. → ✅ I have gone to the store.
- ❌ Yesterday I have eaten sushi. → ✅ Yesterday I ate sushi.
3. Articles (a, an, the)
Articles are one of the biggest stumbling blocks for non-native speakers. Use a before consonant sounds, an before vowel sounds, and the for specific or previously mentioned nouns.
- ❌ She is an university student. → ✅ She is a university student.
- ❌ I saw movie last night. → ✅ I saw a movie last night.
4. Preposition Errors
English prepositions are not always logical and must be learned in context. See our full guide: How to use in, on, and at.
- ❌ She is good in math. → ✅ She is good at math.
- ❌ We met on Monday at the morning. → ✅ We met on Monday in the morning.
5. Comma Splices and Run-On Sentences
Joining two independent clauses with only a comma creates a comma splice. Use a conjunction or a semicolon instead.
- ❌ I was tired, I went to bed. → ✅ I was tired, so I went to bed.
- ❌ He studied hard he passed the exam. → ✅ He studied hard, and he passed the exam.
6. Misplaced Apostrophes
Apostrophes mark possession or contractions — never plurals.
- ❌ The dog's are barking. → ✅ The dogs are barking.
- ❌ Its a great idea. → ✅ It's a great idea.
📖 Further reading: 10 Common English Grammar Mistakes and How to Fix Them
Who Uses This English Grammar Checker?
- Students — proofreading essays, reports, and assignments before submission
- Professionals — polishing emails, proposals, and business documents
- ESL learners — understanding grammar rules with clear explanations in their native language
- Writers and bloggers — catching errors before publishing
- Job seekers — perfecting cover letters and resumes
📱 Mobile App
Check grammar on the go
