Free Grammar Checker

A grammar checker analyzes the structural correctness of your writing — subject-verb agreement, tense consistency, modifier placement, and clause construction. Unlike a spell checker that focuses on individual words, a grammar checker evaluates how words work together in sentences and paragraphs.

English grammar has hundreds of rules, many with exceptions. Even fluent writers struggle with dangling modifiers, comma splices, and pronoun-antecedent agreement. A grammar checker applies these rules systematically to every sentence, catching errors that manual proofreading misses because your brain auto-corrects familiar patterns.

Our grammar checker runs entirely in your browser. It scans for capitalization errors, missing punctuation, subject-verb disagreement, passive voice overuse, run-on sentences, and common grammatical mistakes — then presents each issue with an explanation and suggested fix.

Grammar checking is essential for anyone whose writing is read by others — whether the stakes are a grade, a job offer, or a reader's trust.

Manual proofreading relies on your brain to spot errors — but your brain is also the one that made them. Cognitive biases like reading what you meant to write (rather than what you actually wrote) make self-editing unreliable for grammar. Studies show writers catch only about 60% of their own grammatical errors on a first pass.

A grammar checker applies rules mechanically and consistently. It never gets tired, never skims, and never assumes you meant "their" when you wrote "there." For structural errors like subject-verb disagreement, dangling modifiers, and comma splices, algorithmic checking is more reliable than human review alone.

The best workflow combines both: use the grammar checker to catch rule-based errors first, then proofread for meaning, flow, and style. This two-pass approach produces cleaner writing in less time than either method alone.