Is the AI grammar checker free?

Yes — 100% free, no signup, no usage limits.

Does it save my data?

No. Inputs are processed in your browser and never uploaded to a server.

Can I use it on mobile?

Yes. The interface is fully responsive and works on iOS and Android.

Will it change my voice or style?

No. The model is instructed to preserve voice, register, and word choice unless a phrase is grammatically wrong. It corrects, it doesn't rewrite.

Does it support languages other than English?

Yes — the underlying OpenAI model handles 40+ languages. Paste text in any language and it will check grammar in that language.

AI Grammar Checker — Fix Grammar, Spelling & Punctuation

Paste any text — the model returns a corrected version plus a list of every change with a one-line reason. Preserves your voice, doesn't rewrite. BYOK OpenAI.

OpenAI API Key

Your key is stored only in your browser (localStorage) and sent directly to the provider. We have no backend, so it never touches our servers. Get an OpenAI API key.

How to use

Step 1: Paste an OpenAI API key
Step 2: Paste the text you want checked
Step 3: Click Check — see corrections and explanations

Frequently asked questions

A tool that fixes grammar, spelling, and punctuation in any text and explains every change it made.