Projects / LanguageTool


LanguageTool is a style and grammar checker that currently supports English, Polish, German, French, Dutch, and other languages to a different degree. It scans the words and their part-of-speech tags for occurrences of error patterns, which are defined in an XML file. More powerful error rules can be written in Java.


Recent releases

  •  31 Mar 2014 11:54

    Release Notes: The error detection rules have been updated for Catalan, English, Esperanto, French, German, Japanese, Polish, Portuguese, and Russian. A new 'antipattern' element has been added to the XML rules which can be used to avoid false alarms. Some minor cleanups to the API have been applied.

    •  09 Jan 2014 12:51

      Release Notes: A bug has been fixed that caused performance problems when spellchecking American English text. The problem didn't affect LibreOffice/OpenOffice, thus only the stand-alone version gets an update.

      •  30 Dec 2013 15:12

        Release Notes: This release includes many updates for the error detection rules for English, French, Catalan, Polish, Portuguese, German, and Breton. Several small bugs have been fixed. The main stand-alone file is now called languagetool.jar (instead of languagetool-standalone.jar).

        •  30 Sep 2013 18:54

          Release Notes: Many updates for the error detection rules for English, French, Catalan, Ukrainian, Portuguese, German, and Breton have been added. Thanks to the use of multiple threads for text checking on modern hardware, performance has been improved. The syntax of the error rules has been extended. English now has a chunker to detect singular and plural noun chunks. The standalone version now underlines errors with a red or blue line. The Java API has seen clean-ups and improved thread safety. Other small bugs have been fixed. LanguageTool requires Java 7 now.

          •  30 Jun 2013 20:03

            Release Notes: Many error detection rules have been updated, especially for French, Catalan, German, Portuguese, Russian, Esperanto, and Breton. Several small bugs have been fixed.


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