LanguageTool

Style and Grammar Checker

Screenshot of LanguageTool

LanguageTool is an Open Source style and grammar proofreading software for English, French, German, Polish, Dutch, Romanian, and a lot of other languages. You can think of LanguageTool as a software to detect errors that a simple spell checker cannot detect, e.g. mixing up there/their, no/now etc. It can also detect some grammar mistakes. It does not include spell checking.

LanguageTool will find errors for which a rule is defined in its language-specific configuration files. Rules for detecting more complicated errors can be written in Java.

Try it online

Language:

Try LanguageTool without installation, using Java WebStart. Requires Java 6 or later:
Start LanguageTool (29 MB)

Download

Untested daily builds of the current development version are available at the snapshot directory (CHANGES.txt).

News

2012-02-04: See our new language-specific pages for German, Russian, and Esperanto

2011-12-31: Released LanguageTool 1.6. Changes include:

  • Rule updates for several languages (Chinese, French, Breton, and others)
  • Renamed the Java packages from de.danielnaber.languagetool.* to org.languagetool.*
  • For a more detailed list of changes, see the Changelog

2011-11-18: We now offer Wikicheck, a new service to check Wikipedia pages with LanguageTool

Follow us on twitter for the latest news. See the news archive for old news.

License & Source Code

LanguageTool is freely available under the LGPL. The source is available at Sourceforge via SVN. The contents of this homepage is available under CC BY-SA 3.0.

Page last modified: 2012-02-04