English
French
German
Polish
Catalan
Italian
Breton
Dutch
Portuguese
Russian
Esperanto
Galician
Greek
Icelandic
Japanese
Lithuanian
Romanian
Slovenian
Spanish
Swedish
Tagalog
Ukrainian
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:
- The proper name in singular (IATA) must be used with a third-person verb:
codes .: [Visit Rule]
...: 1. Companies and organizations Alitalia, IATA code for the national airline of Italy AstraZeneca, a ...
Login to vote · Visit Wikipedia - Possible agreement error. The noun edition seems to be countable, so consider using:
1998 editions .: [Visit Rule]
... & Unwin, Woking) Johns Hopkins University Press, 1998 edition with foreword by Jimmy Carter: ISBN 0-8018-6097-0...
Login to vote · Visit Wikipedia - Two consecutive dots:
[Visit Rule]
...k at rival DC Comics, and penciler John Romita, Jr.. Roger Stern, who had written nearly 20 issues of ...
Login to vote · Visit Wikipedia
Visit the LanguageTool homepage to download LanguageTool as an extension for LibreOffice or OpenOffice.org