Catch mistakes before you submit.
Check your text for common spelling and grammar mistakes, with an explanation for every fix. Free online grammar checker.
Built to spot text from tools like these
- ChatGPT
Used by students at the world's top universities
- Harvard
- MIT
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- Oxford
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- ETH Zürich
- Yale
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- Imperial College London
- TUM
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- UCL
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Based on individual use by students and graduates · no affiliation
What people say
4.538
Real reviews from people who use the service. Emails are partly hidden, and reviews are shown in the language they were written in.
I send twenty client emails a day in a language that isn't my first. Thirty seconds here before hitting send has saved me from a lot of small embarrassments.
Ran my cover letter through it and found three awkward constructions I'd read past ten times. It explains the fix rather than just replacing the text.
I publish blog posts without an editor. This is the closest thing to a second pair of eyes I have, and it's free with no signup.
Academic writing in English as a second language is brutal. This catches article and preposition errors that every other free checker misses.
I check reports at the end. It leaves proper nouns alone.
I use it before publishing posts. Spelling and style are listed separately.
For me, I use it before publishing posts. It leaves proper nouns alone.
In my experience, I use it before publishing posts. It explains why, so I actually learn something.
I run emails through it before sending. In my experience, it leaves proper nouns alone.
Paste it, and fix only what's wrong.
Paste your draft
A cover letter, report or email as it is. Up to 4,000 characters at a time.
See the slips
Common misspellings and clear grammar mistakes are shown as “this → that”, with a short reason.
Go further with AI
AI mode also smooths awkward phrasing and repeated expressions in one pass.
Grammar fixed? Now the sentences.
When the grammar is right but a sentence still sounds off, try saying it another way.
After editing, check you're still inside the limit — with and without spaces.
If you need to cut length, keep only the key sentences.
If an AI helped with the draft, check the AI score before you submit, too.
Questions people ask.
- Is the grammar checker free?
- Yes. Sign in with Google and run the free check — it's rule-based and doesn't use any credits.
- What does it catch?
- Common misspellings and clear grammar slips — each correction comes with a short reason.
One more look before you hit submit.
The rule-based check is free after sign-in. Use a credit only when you want the AI to smooth the grammar as well.













