Grammar Checker
A checker that only highlights errors teaches you nothing. This one explains the rule behind every mistake and names your most frequent error pattern.
What this tool does
The Grammar Checker is a free AI tool that finds grammar, punctuation, article, preposition, agreement, and tense errors in any English text, quotes each error with its correction in bold, explains the rule in one line, and identifies your single most frequent error type so you know what to drill.
How to use the Grammar Checker
- 1Paste any English text — an essay, an email, a paragraph you're unsure about.
- 2Click “Check grammar” and read the numbered error list.
- 3Pay most attention to the “pattern to watch” — one recurring rule fixed beats ten one-off corrections.
- 4Re-check a fresh piece of writing in a few days to confirm the pattern is gone.
Errors versus patterns
Learners don't make random mistakes — they make the same three or four mistakes repeatedly: articles before uncountable nouns, prepositions after particular verbs, tense drift in narratives, subject-verb agreement across long subjects. A hundred scattered corrections are worth less than identifying the one rule that accounts for a third of your errors. That's why every report groups repeats together and ends by naming your dominant pattern with a self-check strategy for it.
For IELTS candidates specifically
Grammatical Range & Accuracy is 25% of both writing tasks and the speaking test, and the descriptors count error-free sentences: Band 7 requires “frequent error-free sentences”, Band 6 tolerates “some errors” that rarely impede. Running your practice essays through the checker before the band-score checkers tells you whether your ceiling is grammatical accuracy or something else entirely — a diagnosis worth having before you spend weeks on vocabulary.
Free tools are how you practise. Here's how you keep the progress.
An account never changes your free limits — it saves your work: practice history with full AI feedback reports, vocabulary progress, and learning statistics. Free, no card, nothing to cancel.
Create a free accountFrequently asked questions
What's the difference between this and the Grammar Corrector?
The checker shows you every error with the rule explained — built for learning. The corrector hands back a corrected version with a change list — built for speed when you just need the text fixed. Use the checker when studying, the corrector when shipping.
Does it invent errors to seem thorough?
No — it's explicitly instructed never to. If your text is clean, it says so and points out something you did well. A checker you can't trust when it's quiet is useless.
Does it handle punctuation and word choice too?
Yes: commas and run-ons, apostrophes, capitalization, plus wrong-word errors (affect/effect, its/it's) and unnatural collocations (“do a mistake” → “make a mistake”), which sit between grammar and vocabulary and slip past simpler tools.
Is it free? How much can I check?
Free with daily limits, no account needed. A free account raises the limit; a one-time Premium Pass raises it much further. Nothing subscribes or renews.
Related free tools
Grammar Corrector
Get a corrected version of your text instantly, with the changes listed so you learn from them.
Text Improver
Upgrade weak sentences: stronger vocabulary, tighter structure, clearer meaning.
Task 2 Checker
Paste your essay and get an estimated band score with feedback on all four criteria in seconds.
Paraphraser
Rewrite any sentence or paragraph in a different way — five modes from simple to academic.