AI grammar checker — fix grammar, spelling and punctuation
Paste text and get a corrected version with grammar, spelling and punctuation fixed, while your meaning, voice and formatting are kept. This is a bring-your-own-key AI tool: it works with your Anthropic (Claude) or OpenAI (GPT) API key, which is stored only in this browser and never sent to us to keep. Your text goes to your chosen provider through our server, which never logs or stores your key or your text. It is free — you pay the provider directly for what you use.
How to use it
- Add your Anthropic or OpenAI API key in the key bar (it is saved only in this browser).
- Paste your text and pick any options.
- Press the button — the result comes back from your chosen AI. Copy or Download it.
FAQ
How do I check grammar with AI?
Paste your text, add your key and press Fix grammar. The AI returns the corrected text, changing only what is wrong and keeping your tone.
Is my text kept private?
Your API key lives only in this browser's local storage. Each request sends your text and key to your chosen AI provider through our server, which never logs or stores either. We keep no copy.
Will it rewrite my style?
No — it is instructed to correct errors only, not to reword or restyle. For rewriting, use the paraphraser instead.
Where do I get an API key?
From your provider: Anthropic (console.anthropic.com) for Claude, or OpenAI (platform.openai.com) for GPT. Paste it into the key bar once and it is remembered on this device until you clear it.
Does it cost anything?
The tool is free. You pay your AI provider directly for the tokens each request uses — usually a fraction of a cent for short text.
Limits
It corrects mechanics, not facts or logic. Review edits on legal or technical text. Unlike our offline tools, this one calls a cloud AI, so it needs a connection and your own key.
Related
Follow up with the paraphraser to change tone, or the summarizer to condense.
Your key stays in this browser. Clear it any time from the key bar.