Grammar Checker
Catch the mistakes that slip past a quick read
Corrected text
What was corrected
The checker runs your text against a set of rules covering spelling slips, missing apostrophes, doubled spaces, misplaced punctuation, subject-verb mismatches and the a/an choice. It returns a corrected version alongside a list of what changed and why, so you learn the pattern instead of just accepting a fix. Readability is scored too, so you can see whether a sentence needs breaking up.
How it works
Paste your text
Drop your draft into the box, or upload a .txt file if it is already saved somewhere.
Run the tool
One click starts the analysis. Longer passages give a steadier result than a single sentence.
Read the breakdown
You get a headline result plus the underlying measurements, so you can see how the score was reached.
Why people choose ZeroGPT
Runs in your browser
Nothing you paste or upload is sent to a server. Grammar Checker works offline once the page has loaded.
Free, with no account
There is no sign-up wall, no credit card and no daily limit hiding behind a paywall.
Built for real work
Grammar Checker is designed for students, writers and editors who need an answer in the middle of a task, not a demo.
Explore every ZeroGPT tool
Fifteen free tools for writing, checking and cleaning up your work — all running in your browser.
AI Detector
Find out whether text was written by a human or by ChatGPT
AI Humanizer
Turn stiff, model-sounding writing into something a person would say
AI Image Detector
Check whether a picture came from a camera or from a generator
AI Video Detector
Sample a clip frame by frame and see whether a model made it
Background Remover
Cut a clean transparent PNG out of any picture
Plagiarism Checker
Compare two documents and see exactly which passages overlap
AI Summarizer
Cut a long document down to the sentences that carry the meaning
AI Paraphraser
Say the same thing a different way, in the register you need
AI Translator
Move text between languages without losing the sense
ZeroChat-4 & 5
Ask a question and get pointed at the right tool
Word Counter
Every number you need about a piece of writing, live as you type
Dictionary
Definitions, pronunciation and synonyms in one lookup
AI Email Helper
A workable draft for the email you have been putting off
Pomodoro Timer
Twenty-five minutes of work, then a break you actually take
Frequently asked questions
Is Grammar Checker free to use?
Yes. Every tool on ZeroGPT is free, with no account, no trial period and no credit card. There is nothing to unlock.
Is my text or file uploaded anywhere?
No. Grammar Checker runs entirely in your browser using JavaScript. Your content is read from the page, processed on your device, and discarded when you close the tab.
How accurate is it?
It is a strong signal, not a verdict. Grammar Checker measures statistical patterns, and patterns can be wrong in both directions. Use the result as one input into your own judgement, especially when the stakes are high.
Does it work on my phone?
Yes. The layout adapts to small screens and the tools are built to work with touch. Very large files may be slower on an older phone.
Which languages are supported?
ZeroGPT is available in English, French, German, Spanish, Italian and Portuguese. The text tools work best on English but handle other Latin-script languages reasonably well.