Grammar and Spell Checker - LanguageToolby LanguageTooler GmbH

★ Finds many errors that a simple spell checker cannot detect
★ No registration needed
★ Supports more than 25 languages (see below)
★ Works on almost any website including Gmail, Facebook, twitter

With this extension you can check text with the free style and grammar checker LanguageTool. LanguageTool finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word, and it can detect some grammar problems. It supports more than 25 languages, including English, Spanish, French, German, Polish, and Russian.

LanguageTool checks the spelling and grammar of almost any text you type on the web. It is compatible with almost all text, regardless of source, including social networks such as Twitter or LinkedIn and online e-mail services, such as Gmail. Very few sites like docs.google.com, addons.mozilla.org, and chrome.google.com currently aren't supported - please use https://chrome.google.com/webstore/detail/languagetool/kjcoklfhicmkbfifghaecedbohbmofkm for Google Docs instead.

With LanguageTool our aim is to give users a fully-featured grammar checker and proofreader that will enable them to have control and confidence over their content. While LanguageTool is a vital extension for non-native speakers, it’s also smart enough to recognize mistakes that native speakers commonly make and it will improve your writing overall. This grammar and spelling correction works across all variations of common language; distinguishing between U.S. and British English, for instance. LanguageTool also features a personal dictionary for exceptions or words that you might commonly use but that are not found in a conventional dictionary. LanguageTool will recognize these words in future grammar checking and proofreading.

Unlike Grammarly ("Grammerly" :-) and Ginger, LanguageTool works for many languages and offers many of the same features.


Privacy

Your privacy is important to us: By default, this extension will check your text by sending it to https://languagetool.org over a securely encrypted connection. No account is needed to use this extension. We don't store your IP address. See our privacy policy for more details.


Why does LanguageTool require permission "Access your data for all websites"?

This permission is required to read the text you type into text fields. LanguageTool will read the text you type into multi-line fields. Most single-line fields and all password fields are skipped.


Bugs

Please report bugs at https://forum.languagetool.org or at github.


Premium Version

We offer a Premium version which is linked from several places in the add-on. This add-on also works without payment and registration, though.


Offline Use (recommended only if you're an advanced computer user)

To use this add-on with a local server, unzip the LanguageTool desktop version from our homepage and run this command (requires Java):

java -cp languagetool-server.jar org.languagetool.server.HTTPServer --allow-origin '*'

Then, open the add-on configuration and under "Experimental Settings" set "local server" as the server URL and save the configuration. Note that the default configuration of the local server might lack some features of the server running at languagetool.org - see this comparison for details.


Supported Languages

English (Australian, Canadian, GB, New Zealand, South African, US), French, German (Austria, Germany, Swiss), Asturian, Belarusian, Breton, Catalan (also Valencian), Chinese, Danish, Dutch, Esperanto, Galician, Greek, Italian, Japanese, Khmer, Persian, Polish, Portuguese (Brazil, Portugal, Angola, Mozambique), Romanian, Russian, Slovak, Slovenian, Spanish, Swedish, Tagalog, Tamil, Ukrainian

Old Versions

Old versions are still available at https://addons.mozilla.org/firefox/addon/languagetool/versions/.