How to use Grammar Checker
- Paste or type your English text, up to 1,500 words. Or tap "Try an example" to see it work.
- Tap "Check grammar". The first time, the AI (about 480 MB) downloads once and stays on your device; then each sentence takes under a second.
- Each suggested correction shows your words crossed out and the new words highlighted. Tap Accept on the ones you agree with, or Accept all.
- Copy your corrected text, save it as a .txt file, or tap "Edit this text" to keep working on it.
Why use Grammar Checker
- You accept every change
- Corrections are suggestions, shown word by word against your own sentence. Nothing changes until you accept it, and "Keep mine" puts your version back.
- A grammar corrector, not a rewrite
- It corrects mistakes of grammar, spelling, punctuation and word form, and is built to leave correct sentences, your style, British or American spelling, names and numbers as they are. A suggestion that would drop a word of meaning or turn a question into an order is never shown.
- Measured on the English our visitors write
- We tested it on sentences written the way people in Pakistan, India and the Gulf often write English ("I am working here since 2019", "discuss about", "informations"). The figures are in the FAQ below.
- Private: your text stays on your device
- The checker is an AI model (Qwen3-0.
6B, Apache 2.0) running in your browser on the graphics chip. Nothing you type is uploaded, and there is no account. - Fast after the first time
- The model downloads once and is kept by the browser. On a laptop with built-in graphics, a sentence takes under a second.
- Free, with no limit on checks
- There is no word quota per day and no premium tier: it runs on your own computer, so checking costs nothing.
About this tool
A grammar checker is useful whenever English is not the language you think in but it is the language you have to write in: an email to a manager, a cover letter, a message to a landlord or a school, an assignment. The mistakes people make are predictable. Writers whose first language is Urdu, Hindi, Arabic or Malayalam often say "I am working here since two years", "we discussed about the plan", "please send me the informations", "he don't", "one of my friend", or mix up its and it's, their and there. This checker is tuned for those mistakes. It reads your text one sentence at a time and proposes a corrected sentence only when it finds a mistake; every change is shown against your original words, so you can see exactly what it would change and why it matters.
It is a small AI model, so it is careful rather than complete. In our tests it caught about half to two thirds of the sentences with mistakes, and when it did suggest a change, the change was right far more often than not; a sentence with no mistake was almost always left alone. It does not rewrite for style, make your writing more formal, or check facts. Use it as a second pair of eyes before you send something, and give important text a last read yourself. It works on English only, on a computer with a recent Chrome, Edge or Safari that has WebGPU; phones are not supported yet because the model needs more memory than most phones give a web page.
Frequently asked questions
Is this grammar checker free?
Yes, with no sign-up, no daily limit and no paid tier. The AI runs on your own computer, so checking costs us nothing. The model (about 480 MB) downloads once and is kept by your browser.
Is my text uploaded or stored?
No. The checker runs in your browser on your device. Only the model files are downloaded from this site, the first time; what you type is never sent anywhere.
How accurate is it?
We measured it on 120 new sentences written the way our visitors write (80 already correct, 40 with mistakes). It left 76 of the 80 correct sentences alone (95 %), 27 of its 32 suggestions were right (84 %), and it fixed 27 of the 40 sentences with mistakes. So it is careful rather than complete: read each suggestion before you accept it, and give important text a last read.
Will it change my writing style?
No. It is told to correct mistakes only, keep your words, and keep British or American spelling as you wrote it, and a check after the AI hides any suggestion that is only a matter of style (a contraction, "Mr." or a comma) or that drops a word of meaning.
Why does it need a computer with WebGPU?
The model runs on the graphics chip through WebGPU; while it works it uses about 1.3 GB of graphics memory and about 4 GB in the browser tab, so a computer with 8 GB of memory or more is best. Recent Chrome and Edge on Windows, Mac and ChromeOS have it, and so does Safari 26 on a Mac. Most phones do not yet give a web page enough memory for the model, so phones are not supported for now.
Does it check Arabic or Urdu?
No, it checks English text only. Arabic or Urdu text is recognised and the button stays off with a note.
How long can my text be?
Up to 1,500 words at a time. It checks one sentence at a time and shows the progress and the time left; you can stop at any point and keep the sentences already checked.
Can it paraphrase or summarise too?
The same AI can summarise: the Text Summarizer turns a long text into key points with their sources. It runs on the same model, so if you have used one, the other starts without a download.
Built and maintained by Saad Naeem
AI engineer, Doha · Updated