What Is a Grammar Checker Tool?
The online grammar checker by GPTinf scans your text for errors that make writing look careless or hard to read. These include subject-verb disagreement, incorrect verb tense, misspellings, misused punctuation, and contextually inappropriate words.
The tool catches errors that are easy to miss mid-read: a comma splice buried in a long sentence, an apostrophe in the wrong place, a tense shift that throws off the whole paragraph. Each issue is flagged inline with a color-coded underline and includes fix suggestions.
Key Features of Grammar Checker
Two-panel editor
The editor splits into two panels. In the left panel, you type or paste your text. Click the button to run the check. Errors appear as colored underlines directly in your text. The right panel shows a scrollable list of all issues found, with a fix card for each. When everything's resolved, the panel reads: "Your grammar looks good."
Grammar, spelling, and punctuation in one pass
The tool checks all three at the same time. Grammar covers subject-verb agreement, tense consistency, misplaced modifiers, sentence fragments, and run-on sentences. Spelling catches both typos and contextually wrong words that a dictionary alone would pass. Punctuation flags comma splices, apostrophe misuse, missing Oxford commas, and incorrect semicolons.
Three ways to fix errors
Click any underline to open an inline popover with the suggested fix and apply it in place. Work through the right panel card by card to go in order. Or use Fix All Errors on a paid plan to apply every suggestion at once.
How to Use Grammar and Punctuation Checker
- Paste or type your text — Open the tool and use the left panel as your editor. Type directly or click Paste to drop in content from your clipboard.
- Get the Results — Click the button to run the grammar checker. A spinner appears in the right panel while it runs.
- Fix the underlines — Errors appear as colored underlines in your text. Click any underline to see the error and the suggested fix. Apply it in place with one click.
- Copy your corrected text — Click Copy in the toolbar to copy the clean version, or Clear to start over.
Who Can Use Grammar and Spell Checker
AI Content Creators & Bloggers
You're producing content at volume with AI-assisted drafting. The checker fits into the draft-check cycle without friction: paste, wait a second, fix what's flagged.
Professional Writing
A grammar error in a pitch deck or client report is a credibility problem. Use it as a sentence grammar checker before anything goes out. Paste the document, and the right panel gives you an exact count of what needs fixing. Fixes apply in place without reformatting anything.
Students & Academic Writers
For students and academic writers, maintaining a formal tone, clear structure, and consistent tense across long assignments can be challenging. This academic writing grammar checker helps review your work for errors and improve clarity before submission.
Non-Native English Speakers
Article usage, preposition placement, and subject-verb agreement are genuinely difficult to internalize in a second language. The English grammar checker flags each instance with a clear label and suggested fix, so you can work through errors systematically.
What You Get With Free Grammar Checker
No daily word caps on any plan. The limit is per check, not per day — run as many checks as you need.
| Anonymous | Free Account | Paid Plans | |
|---|---|---|---|
| Words per check | 1,000 | 4,000 | 20,000 |
| Fix errors one by one | Up to 3, then signup prompt | Unlimited | Unlimited |
| Fix All Errors | Upgrade prompt on click | Upgrade prompt on click | Executes immediately |
The Fix All Errors button is visible to everyone. Clicking it on a free or anonymous account opens an upgrade tooltip, no hidden buttons or lock icons.
English Grammar Checker: Fix Errors Before They Cost You
Paste any text into the right panel and get a full error report in one second. Grammar mistakes, spelling errors, and punctuation issues flagged inline and ready to fix. No account needed to start, no daily limits on any plan. This tool can be used to check an AI draft, polish a client document, or review an essay. The checker runs in your browser and applies fixes in place without breaking your formatting.