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LanguageTool is an Open Source proofreading tool. This website lists LanguageTool's error detection rules and applies them to Wikipedia content for demonstration and testing purposes.


Browse Rules

LanguageTool uses rules to detect errors. Each rule represents a potential error in the text to check. Have a look at all rules of all languages here.

Check any Wikipedia page


Check Rules' Results

We use LanguageTool on Wikipedia data to test which rules work well and which need more work. 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:


  • Siffror med ändelser binds ihop med ett kolon: 1a: [Visit Rule]
    ....jpg|Bebyggelsen på Lindholmen Fil:Stora Essingen 1a.jpg|Stora Essingen 7. Delbas...
    Login to vote · Visit Wikipedia
  • Adjektivet är böjt i positiv utrum (grafisk) och borde då föregås av ordet "en" istället för "ett" alternativt böjas i positiv neutrum. Menade du: en grafisk gränssnitt.: [Visit Rule]
    ...ia Communicator med flera. GEOS erbjöd användaren ett grafisk gränssnitt. 1. Externa länkar , information från dmoz.org ...
    Login to vote · Visit Wikipedia
  • Förkortningar som böjs binds ihop med ett kolon: MUX:ar : [Visit Rule]
    ...igital TV, i motsats till Sverige sänds flertalet MUXar MPEG4-kodade, vilket gör att HD-TV nu kan tas in ...
    Login to vote · Visit Wikipedia
Other random examples · All matches · User votes

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