LanguageTool
Plugin : A set of capabilities installed into an AI application or a host · requires chrome/word/docs
Multilingual grammar and style checker, European open-core.
The best free and most privacy-friendly tool for writing.
Security reflects where data goes, requested permissions and incidents on record at the verification date. It is not a guarantee of zero risk: check the deployment mode and the connections you enable.
What it does, concretely
Writing without errors in a foreign language, or even in one's native tongue, remains challenging: traditional spell checkers miss grammatical mistakes, style issues, and punctuation errors. LanguageTool fills this gap by analysing text in depth, going well beyond simple letter-by-letter verification.
The tool underlines errors in real time as you type: red for spelling and blue for style. It offers correction suggestions directly within the interface, and double-clicking any word displays its synonyms. An AI-based paraphrasing tool also allows entire sentences to be rewritten to make them more formal, concise, or simple.
LanguageTool is aimed at anyone who writes regularly: students finalising a thesis, professionals drafting emails or reports, journalists, or non-native speakers wanting to write in a foreign language. It supports more than 30 languages and dialects, including six varieties of English.
It will be less suitable for those who only need a basic spell checker already built into their word processor, or for those who want comprehensive correction without subscribing to a paid plan, as the most advanced suggestions are reserved for the Premium version.
What it offers
- ·Real-time spell checking with red underlining of detected mistakes.
- ·Advanced grammar checking covering subject-verb agreement, incorrect plural forms, and misuse of grammatical forms.
- ·Punctuation correction, including commas, dashes, and excessive exclamation points.
- ·Casing verification for proper nouns, months, places, and national identities.
- ·Style suggestions to detect overused phrases, redundant words, and improper word choice (paid for advanced suggestions).
- ·AI-based paraphrasing tool to rewrite sentences in formal, fluent, simple, or concise mode (paid).
- ·Picky Mode for advanced punctuation, style, and typography suggestions (paid).
- ·Writing statistics: productivity tracking, languages used, errors made, and suggestions applied (paid).
In practice
- Price
- Freemium · from 4.99 €
- Commercial use
- Commercial use: yes
- Available on
- web, chrome, word, macos, windows
- Host
- chrome/word/docs
- Licence
- LGPL
- FR interface
- Yes
Security and data
- Rating
- Security: nothing to flag
- Your data
- Data with the vendor
- Known incidents
- Aucun majeur.
- Maintenance
- Active
Links and repository checked on 25 October 2026 · added on 1 January 2005
How to install LanguageTool
curl -L https://raw.githubusercontent.com/languagetool-org/languagetool/master/install.sh | sudo bash $options