Free Grammar Checker

A grammar checker has one job: find the errors, fix them, and show its work. The last part is the one most free grammar check tools skip. They return a cleaned-up block of text, and you are left diffing it against your original by eye, or worse, pasting it in on trust. For academic writing that is a real problem, because you are accountable for every sentence you submit, and because a checker that silently rewrites can shift a hedge into a claim or flatten a technical term into an everyday word without you noticing.

This tool takes the opposite approach. The correction engine reads your text the way a proofreader would, fixes grammar, spelling and punctuation, and then reports every change as a pair: what you wrote, what it became, and the rule that applied. Errors are labeled by type, so you can see at a glance whether your weak spot is subject-verb agreement, article use or comma placement. Over a semester of checking your own paragraphs, that feedback loop quietly does what a style guide never manages: it changes what you write the first time.

Grammar is also only one layer of mechanics. If punctuation is your recurring issue, the dedicated punctuation checker goes deeper on commas, semicolons and apostrophes, and the spell checker handles typos while telling you whether your spelling reads as American or British. For a graded piece of writing, the essay checker adds feedback on structure, clarity and tone on top of the mechanical fixes.

And when the document matters more than 250 words at a time, the ProofreaderPro editor proofreads complete manuscripts with the same philosophy scaled up: tracked changes on the whole document, accepted or rejected by you, line by line. The free checker on this page is the preview of how that works.