Free tool

Grammar checker, private and free.

Paste your text and fix mistakes one click at a time: doubled words, spacing around punctuation, missing capitals, a or an, mixed-up phrases like "could of" or "alot", and common misspellings. In Chrome on a computer that has Chrome's built-in Proofreader, it also checks full grammar, spelling and punctuation with AI that runs on your computer. Your text is never sent anywhere.

This browser has no built-in proofreader, so the rules below do the checking. They are sure of what they flag, but they do not read full grammar.

To look at

Your text stays in this browser (it is kept here so it is not lost on reload). Nothing is uploaded.

How it checks

Rules you can trust, AI where it runs.

01 / Rules

Sure things only

Doubled words, spaces, capitals, a or an by sound, mixed-up phrases and over 150 common misspellings: each comes with the fix.

02 / AI

Chrome's Proofreader

Chrome's built-in Proofreader API runs on the computer in Chrome versions and devices that support it, after Chrome downloads its model once.

03 / Private

Nothing leaves

Neither the rules nor Chrome's Proofreader send your text anywhere; it is checked where you type it.

Questions

Good to know.

Is this as good as a paid grammar checker?

The rules catch the common slips reliably but do not understand full sentences. With Chrome's Proofreader it checks grammar too; paid tools also rewrite for tone and style.

Which browsers get the AI check?

Chrome on a computer whose version and hardware support Chrome's built-in Proofreader. Elsewhere the page says so and uses the rules.

Does it work in other languages?

The rules and the misspelling list are for English. Your browser's own spellchecker still underlines words in other languages.

Is my text uploaded?

No. It stays in your browser.