Writing
Free AI Grammar Checker — Fix Mistakes Instantly
Paste your writing and let AI catch grammar, spelling, and punctuation errors — with clear corrections you can apply in one click.
What is Grammar Checker?
Cobain AI's Grammar Checker reviews your text for grammar, spelling, and punctuation mistakes and suggests clear fixes. Paste an email, essay, or article and the AI flags errors and awkward phrasing so your writing reads correctly and professionally — before anyone else sees it.
Key features
Grammar, spelling & punctuation
Catches the common mistakes a quick read often misses — agreement, tenses, typos, and stray commas.
Clear corrections
See what to change and why, so you fix the error and learn the rule at the same time.
Improves clarity
Beyond errors, it flags clunky or unclear sentences and suggests smoother phrasing.
Works on any text
Check emails, essays, reports, captions, or full articles — short notes and long documents alike.
Polish before you publish
A fast final pass that helps your writing look careful and professional.
How it works
- 1
Paste your text
Add the email, essay, or document you want to check.
- 2
Run the check
The AI scans for grammar, spelling, and punctuation issues.
- 3
Apply and copy
Review the suggested corrections, accept what you want, then copy the clean version.
Perfect for
Frequently asked questions
Is the grammar checker free?
Yes. You can start checking your writing for free with a Cobain AI account, with paid options for higher volume.
What does it check for?
Grammar, spelling, and punctuation, plus suggestions for unclear or awkward sentences.
Does it explain the corrections?
Yes — it shows the suggested fix so you can understand the change, not just accept it blindly.
Can I check long documents?
Yes. It works on everything from a single sentence to long articles and reports.
Will it catch every mistake?
It catches the vast majority of common errors, but for high-stakes writing a final human read is always wise.
Ready to try it?
Create your free account and start in seconds.
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