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Check your writing, then learn the rule
Most checkers underline the word and move on, which fixes today's sentence and teaches you nothing. This one shows what changed, what else you could have put there, and why the correction is right.
Grammar checker tool
All toolsEverything runs inside your browser. Your text is never uploaded, stored or logged. GrammarVista.com checks 134 grammar and usage rules, spelling against a 276,000 word English dictionary, and common wordy phrases. Word explorer is the one exception: looking up a definition sends only that single word to a free dictionary service, never your text. It will not catch every possible mistake, and a clean result is not a guarantee that your writing is correct.
Learn the rule
Twelve mistakes that come up again and again
These are the ones the checker flags most often. Each has a test you can run in your head, which is worth more than memorising the rule, because the test still works on a sentence you have never seen.
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Subject and verb
She go to school.
She goes to school.
The test: One person, so the verb takes an s. Two people go, one person goes.
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Your and you're
Your going to love this.
You're going to love this.
The test: Say “you are” out loud. If it still fits, you need the apostrophe.
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Its and it's
Its raining outside.
It's raining outside.
The test: Same trick. Say “it is”. If it fits, use the apostrophe.
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There is and there are
There is many reasons.
There are many reasons.
The test: After “there”, the verb matches whatever comes next, not the word “there”.
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Should have
I should of called.
I should have called.
The test: “Of” is never a verb. It only sounds that way because “should've” is spoken fast.
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Double comparative
This is more better.
This is better.
The test: The -er ending already means “more”. Use one or the other, never both.
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He, she, it
He don't agree.
He doesn't agree.
The test: He, she and it take doesn't. Everyone else takes don't.
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Fewer and less
Less people came.
Fewer people came.
The test: Can you count them one by one? Then it is fewer. Water and time take less.
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One of
She is one of my friend.
She is one of my friends.
The test: “One of” picks a single item out of a group, so the group has to be plural.
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Discuss
We discussed about it.
We discussed it.
The test: “Discuss” already contains the idea of “about”, so the preposition drops.
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Countable nouns
He gave me an advice.
He gave me some advice.
The test: Advice is a mass, not separate items. Count it as “a piece of advice”.
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Verb after a modal
She will went home.
She will go home.
The test: “Will” already carries the tense, so the next verb goes back to its plain form.
Where to start
Where to go once the sentence is fixed
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Grammar lessons
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Vocabulary builder
Expand your word power with meanings and real usage.
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Writing tips
Write clearly and confidently in school or at work.
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Communication skills
Speak and write with confidence in everyday English.
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Answer quiz questions and exercises to build confidence.
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Run your own writing through the checker and see the rule applied.
Who is it for?
- Kids aged 8 to 12 learning grammar for the first time
- Students improving writing and grades
- ESL learners who want the reason, not just the fix
- Parents and teachers helping at home or in class
- Professionals writing clear emails and reports
What it will not catch
Worth knowing before you trust a clean result, because most checkers stay quiet about this and it costs people marks.
- Agreement when the subject is a noun rather than a pronoun. “The boxes is heavy” slips through.
- Comma placement, run-on sentences, and where one sentence should become two.
- Tense that drifts halfway through a paragraph.
- A real word in the wrong place, such as “form” where you meant “from”.
- Tone, argument, and whether the writing actually makes its point.
A clean result means nothing on our list matched. It is not a promise that the writing is correct.
Why choose GrammarVista.com?
- Every correction comes with the reason behind it
- Up to three fixes, so you choose the right one
- Grammar, spelling and word choice in one pass
- No account, no sign-up, no upload of your text
- Mobile friendly and fully responsive
Build better English skills
One lesson, one word, one step at a time. Start with a sentence you are unsure about.
Check a sentence nowRegional usage
GrammarVista.com USA: American English spelling and grammar
The checker on GrammarVista.com is set to American English by default, so it accepts US spellings such as color and organize. Here is what actually changes between the two varieties, and when it matters.
American English at a glance
Neither variety is more correct. What matters is picking one and staying with it.
| Where it shows up | American | British |
|---|---|---|
| Words ending -or or -our | color, favor, honor, labor | colour, favour, honour, labour |
| Words ending -ize or -ise | organize, realize, apologize | organise, realise, apologise |
| Words ending -er or -re | center, theater, meter | centre, theatre, metre |
| Doubled L before an ending | traveled, canceled, modeling | travelled, cancelled, modelling |
| Everyday vocabulary | apartment, elevator, truck, fall, cookie, gas, vacation, sidewalk | flat, lift, lorry, autumn, biscuit, petrol, holiday, pavement |
| Groups of people | The team is winning. | The team are winning. |
| Past participle of "get" | He has gotten better. | He has got better. |
| Talking about the weekend | on the weekend | at the weekend |
| A range of days | Monday through Friday | Monday to Friday |
| Writing a date | August 25, 2026 (8/25/2026) | 25 August 2026 (25/08/2026) |
| Full stop and quotation marks | She said "yes." | She said "yes". |
One caution worth knowing: the -ize ending is not only American. Oxford style uses it in British writing too, so organize is correct on both sides of the Atlantic. The -our and -re endings are the reliable markers. Read the full American English guide.
Who writes this
The person behind GrammarVista.com
Rizwan Aslam
Rizwan Aslam writes and reviews the lessons on GrammarVista.com. He builds English learning tools and works on the grammar rules, examples and practice questions used across the site.
Every rule published here is checked against established English usage before it goes live, and the examples are written for this site rather than copied from elsewhere. Where American and British usage differ, both are shown and labelled.
Good to know
Questions people ask
Is the GrammarVista.com grammar checker free?
Yes, and there is no catch to explain. No account, no email, no daily cap, no paid tier holding the better corrections back. Check the same paragraph twenty times if you want to.
Does GrammarVista.com store the text I paste in?
No. The whole checker, dictionary included, downloads to your browser and runs there. Nothing you type is sent anywhere. You can confirm it yourself: open your browser network tab, type a sentence, and watch that no request goes out.
What kinds of mistakes does it find?
Three kinds. Grammar and usage, running to 134 rules covering subject-verb agreement, verb forms after helper verbs, countable nouns, comparatives, and the prepositions that go with particular verbs. Spelling, checked against a 276,734 word dictionary. And wordy phrasing, where one stronger word does the job of three.
Does GrammarVista.com use American or British English?
American by default, but the dictionary holds both, so neither color nor colour gets flagged. Where the two varieties genuinely differ, we show both and label which is which.
Can GrammarVista.com replace a teacher or an editor?
No, and treating it as one would be a mistake. A checker is good at mechanical things. It has nothing useful to say about whether your argument holds or whether the tone suits the reader.