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Note that you can log in to activate and deactivate only those rules that are important to you.

Browse Rules

LanguageTool uses rules to detect errors. Each rule represents one or more potential errors in the text to check. Have a look and configure all rules of all languages here.

Check Rules' Results

We use LanguageTool on Wikipedia data to test which rules work well and which need more work. Please vote on LanguageTool's results. If there's a real error you're encouraged to fix it in Wikipedia, but note that the check may not be up-to-date and the error may have been fixed already.

Random selection of LanguageTool results when run on Wikipedia:



Visit the LanguageTool homepage to download LanguageTool as an extension for LibreOffice or OpenOffice.org