How the AI grammar checker works
A grammar checker used to be a list of hand-written rules: if a sentence matched a pattern, it was flagged. This tool works differently. It sends your text to a large language model, an AI trained on a very large amount of written language, with one fixed instruction: correct the grammar, spelling and punctuation, keep the meaning and keep the writer's voice.
What happens when you press Check grammar
Your text is trimmed, checked against the 2,000 character limit and sent to the language model together with the English you chose (Indian, US, UK, Australian or Canadian) and the tone you picked. The model reads the whole passage at once, so it understands who is doing what to whom. That is why it can tell "their" from "there" and "its" from "it's" by meaning, not just by spelling.
The model returns the corrected text, and if you ticked "Explain each change" it also returns a short list of what it changed and why. We show the corrected text first so you can copy it, and the list below it so you can learn from the mistakes.
Why choosing US or UK English matters
Spelling and punctuation differ between regions: color and colour, organize and organise, "Mr." and "Mr", single and double quotation marks. A checker that mixes them looks careless to a reader. The dialect option tells the model which set of conventions to apply, so a UK reader gets "realise" and "licence" and a US reader gets "realize" and "license".
Checking Indian English
Indian English follows British spelling (colour, centre, programme) and uses its own words for numbers and money, such as lakh, crore and rupees. Choose Indian English and the checker keeps those, and keeps Indian names and places as they are, while it fixes real mistakes.
The slips it catches most often are the ones that come from translating directly: "I am having two years experience" (I have two years of experience), "revert back" (reply), "discuss about" (discuss), "cope up with" (cope with) and missing articles such as "I am software engineer". Your meaning and tone stay the same, so a polite "Kindly" in a client email is left alone.
What it fixes, and what it leaves alone
It fixes spelling mistakes, wrong word forms, subject-verb agreement, tense slips, missing or extra commas, run-on sentences, capital letters and common word confusions. It is told not to rewrite your ideas, add new facts or change a technical term, so the result still sounds like you.
It is not perfect. Names, product terms, quotes and deliberate style choices can be altered by mistake, and very long or very informal text is harder. Treat the output as a careful first proofread and read it once before you publish or send it.
Who uses an online grammar checker
Students use it to polish essays and applications, job seekers to clean up a CV or cover letter, support and sales teams to proofread emails before sending them, and people writing in a second language to check their sentences. Developers use the same engine through the grammar fix API to add proofreading to a form, a CMS or a chat app.
Privacy and limits
You can check text without an account, up to a small number of runs a day. We do not save your text in a database; it goes to an AI provider only to produce the corrected version, and the result can sit in a short-lived 24 hour cache so a repeat of the same text is instant. We store a count of uses, not the content.