Is this really free, with no signup?

Yes. The grammar engine is an Apache-2.0 licensed dictionary that runs in your browser, so there is no per-word server cost to recoup and nothing to sign up for.

Does my text get sent to a server?

No. The dictionary is downloaded to your browser once and every check runs locally after that — including offline. Confidential drafts, legal text and medical notes never leave the machine.

Which English does it check?

American, British, Canadian, Australian or Indian — switch the dialect and the spelling rules change with it.

It flagged a name or a term I use. Can I teach it?

Yes. Add the word to your personal dictionary, or ignore that specific complaint. Both are stored on this device only.

What is checked besides spelling and grammar?

Style: clichés, filler words, hedging, weak verbs, passive voice and repeated words. Those checks are plain rules and work even where the dictionary isn't available.

Spell Checker Online — Free, Private, No Account

Check spelling in any text with an offline dictionary that runs on your device. Add your own words, apply fixes in one click, and keep the text off the internet.