Correctify, the AI spell checker, works on Chrome, Firefox, Thunderbird and as a Windows app. Pick the version that suits you: the same spelling, grammar and style correction, from a right-click in the browser or a keyboard shortcut on your computer. It’s free, and you never have to copy and paste anything.
The AI spell checker for Google Chrome. It fixes any text on the web without you ever leaving the page: Gmail, social media, forms or online editors. You select, you right-click, and it’s corrected in the language it detects on its own.
Explore the Chrome extension
The AI text-correction extension for Mozilla Firefox. You select a passage, you right-click, and you get a corrected version (spelling, grammar and phrasing), with no copy-pasting, everywhere you write on the web.
Explore the Firefox extension
The AI email proofreader for Mozilla Thunderbird. Right in the compose window, review and fix the body of your messages before you send them: spelling, grammar and style are handled with a single right-click, no copy-pasting or extra tool.
Explore the Thunderbird extension
The desktop app that fixes your text in every program: Word, Outlook, chat apps, notepads. You select, you press the keyboard shortcut, and the text is corrected in place, far beyond the browser. It’s free, on Windows 10 and 11.
Explore the Windows appNo more copy-pasting into an online checker: Correctify slips right into your browser and into Windows. It detects your text’s language on its own (English, French, Spanish and many more), keeps your formatting, and gives you back a spelling, grammar and style correction in seconds, from a right-click or a keyboard shortcut.
Every version is free and asks for no account. They use your own API key (Google Gemini, OpenAI or Anthropic), so your text never goes through a middle-man server. It’s a free, privacy-friendly alternative to paid proofreaders.
Go further: Get a free API key · Full comparison · vs Grammarly · vs Antidote · vs MerciApp
