Grammar Checker for Thunderbird

LanguageTool adds advanced spelling, grammar and style correction to Thunderbird and many other services around the web.

Installation is quick, easy, and free

Grammar, Spelling and Style

LanguageTool finds many more mistakes than your average writing tool, including tone and style improvements.

Works everywhere you write

LanguageTool works in all major browsers, as well as common writing tools like MS Word or OpenOffice.

Multilingual by nature

Check your writing in 20+ languages, such as English, German, Spanish, Dutch and more.

Did you know?

Our browser add-on works anywhere on the web

Receive tips on how to improve your text (including punctuation advice etc.) while typing an e-mail, a blog post or just a simple tweet. Whatever language you're using, LanguageTool will automatically detect it and provide suggestions. To respect your privacy, no text is stored by the browser add-on.

5,000+ Chrome Store reviews

Top-rated grammar checker for Chrome with over 1 million users

Amaze your friends, colleagues and customers with your clear and precise writing.

LanguageTool works perfectly with Thunderbird and many other services around the web. Start today and use LanguageTool wherever you write.