Catch spelling slips, double spaces, repeated words, a/an mix-ups and capitalization errors in seconds. Every fix is highlighted so you can see exactly what changed.
Paste text and hit Check grammar, or load the example.
Spelling, double spaces, repeated words, missing capitals, a/an errors and spacing around punctuation.
Corrections are highlighted in the output and listed with a before → after, so you learn as you edit.
Your text is processed securely for the check, then deleted — we don't store it or train on it.
This is a mechanics checker, not a ghostwriter. It hunts the small, objective mistakes that are easy to type and easy to miss when you reread your own work — the ones that survive a quick glance because your brain auto-corrects them. Misspellings and obvious typos, a word accidentally repeated ("the the"), a double space hiding mid-sentence, a missing space after a comma or period, a lowercase "i" standing alone, "a" where the next word needs "an", and a sentence that forgot its opening capital.
What it deliberately leaves alone matters just as much. It won't reword your sentences, swap your vocabulary for something fancier, or flatten your voice into one house style. Every change is targeted and reversible, so the text that comes back is recognizably yours — just without the slips. If you want it to restructure paragraphs or rewrite for flow, that's a different job, and the AI Humanizer linked below is built for it.
When you hit Check grammar, your text is sent to the TextSight API, scanned against a set of high-confidence rules, and returned with each fix already applied and marked. It isn't running in your browser, and it isn't autocomplete guessing the next word — it's looking for clear, defensible errors and only acting where it's confident, which is why it won't blanket your draft in maybe-suggestions you have to dismiss one by one.
The corrected version lands on the right with the changes highlighted in place, alongside a list of every edit as a plain before → after. You can read the clean text top to bottom or scan the list to see exactly what moved. Nothing is committed without showing its work, so you stay the editor — the tool just surfaces the candidates. Your text is processed for that single check and deleted afterward; it isn't stored or used to train anything.
Most of the time you reach for a grammar checker right at the end — when the thinking is done and you just don't want a typo undercutting it. A few moments where that last pass earns its keep:
Treat the before → after list as a set of suggestions to confirm, not a verdict. Anonymous users get 3 checks a day of up to 500 words each, and signing up for a free account raises that to 5 checks a day; Starter raises it to 25 checks a day at 2,000 words, and Pro removes the daily cap and adds deeper style rewrites and more languages. Run a long document in sections and you'll catch as much, just in a few passes.
Because it favors confidence over coverage, it won't flag everything an editor would. Subtle comma choices, awkward but technically correct phrasing, tone, and missing context are judgment calls it leaves to you on purpose — over-correcting those is how a tool ends up "fixing" things that were fine and erasing your voice. Skim the highlights, keep the changes that are clearly right, and ignore the rare one that doesn't fit your intent. For rewriting that goes beyond clean mechanics, that's where Pro and the AI Humanizer pick up.
The AI Humanizer goes beyond grammar — it improves flow and shows your detection score.
Try the Humanizer