Grammar Checker
Check English grammar, spelling and punctuation.
Questions
How is this different from other grammar checkers?
Most online checkers send your text to their servers. This one runs Harper, an open-source checker, inside your browser, so your writing never leaves your device. It checks rules (grammar, spelling, punctuation, repeated words, common confusions) rather than rewriting your style with AI.
Why does the first check take a moment?
The checker, with its dictionary and rules, is about 8 MB. It downloads the first time you check something, then your browser keeps it, so later visits start quickly, even offline.
Which English does it check?
American, British, Australian, Canadian or Indian English: choose under “English”. It starts on the one used where you are (British in Malaysia, as schools there teach). Spellings like color and colour are judged for the one you pick.
It flagged a name or a technical word. What do I do?
Choose “Ignore” on that issue. The checker doesn’t know every name, brand or specialist term; ignoring hides it for this session.
Is it free? Do I need an account?
It is free to use and there is nothing to sign up for. There are no watermarks and no daily limits.
Missing something, or not working as it should? Tell us