LanguageTool checks grammar, punctuation, and spelling across more than 30 languages, with an AI writing assistant described on its page.
Languagetool
LanguageTool checks grammar and style across more than 25 languages, according to its project description.
About Languagetool
LanguageTool is open-source proofreading software that checks grammar and style in English, Spanish, French, German, Portuguese, Polish, Dutch and more than 20 other languages. According to its project description, it finds many errors that a simple spell checker cannot detect. The GitHub repository contains the core code along with standalone, command-line, server, HTTP client, office extension, Java API and Wikipedia components.
The core is freely available under the LGPL 2.1 or later. Developers can run their own LanguageTool server, use the project's public server over HTTP, or call the software from Java. Building from source requires Java 17 and Apache Maven, and a complete clone downloads more than 500 MiB and needs more than 1,500 MiB of disk space. Docker files listed in the README are community-contributed, and the scripted installer is run with sudo.
Key features
- Grammar and style checking for 25+ languages
- Detects many errors that a simple spell checker misses
- Standalone, command-line, server and HTTP client components
- LibreOffice and OpenOffice office extension package
- Java API with Javadoc and an HTTP API
- Install script with options for package, command and OS
Best for: Developers and technical users who want an open-source grammar and style checker they can self-host or integrate into their own tools.
Good for
- Core code is freely available under the LGPL 2.1 or later
- Covers English, Spanish, French, German, Portuguese, Polish, Dutch and 20+ more languages
- Can be run as your own server, over HTTP, or from Java
Watch out for
- Building from source requires Java 17 and Apache Maven
- A complete clone downloads over 500 MiB and needs over 1,500 MiB on disk
- The Docker files mentioned are community-contributed, not official project artifacts
Languagetool at a glance
- Category
- Online Tools › Text Tools
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Languagetool FAQ
Which languages does LanguageTool support?
English, Spanish, French, German, Portuguese, Polish, Dutch and more than 20 other languages, for a total of over 25.
What license does the core LanguageTool code use?
The LanguageTool core in this repository is available under the LGPL 2.1 or later.
What is needed to build LanguageTool from source?
Java 17 and Apache Maven, plus a clone of the repository; a complete clone downloads more than 500 MiB and needs more than 1,500 MiB on disk.
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