LanguageTool is an Open Source proofreading software for English, French, German, Polish, Romanian, and more than 20 other languages. It finds many errors that a simple spell checker cannot detect like mixing up there/their and it detects some grammar problems.

LanguageTool finds errors by looking for text patterns defined in an XML file. Alternatively, error detection rules can be written in Java.

Try it online

Use LanguageTool in LibreOffice/OpenOffice.org, as a stand-alone application, or embedded in other applications or try it out here (if it doesn't work for you, please use the fallback form):

Try LanguageTool without installation, using Java WebStart (note: this is not the latest version of LanguageTool). Requires Java 6 or later:
Start LanguageTool (>30 MB)

Download

Using LanguageTool locally requires Java 6 or later. Having problems? Please see the list of common problems.

Download LanguageTool for LibreOffice/OpenOffice Version 2.1 (33 MB) Help		Download LanguageTool for stand-alone use Version 2.1 (53 MB) Help
Download LanguageToolFx       extension for Mozilla Firefox Check selected text on websites and text in text fields. No Java required!

Untested daily builds of the current development version are available at the snapshot directory (CHANGES.txt). Old releases are still available in the download directory.

License & Source Code

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

Page last modified: 2013-06-01