Self-Hosting LanguageTool: Grammar Checker API with Docker

Self-Hosting LanguageTool: Grammar Checker API with Docker Every writing tool wants to phone home. Grammarly reads everything you type. Google Docs analyzes your documents on their servers. Even browser extensions quietly ship your text to cloud APIs for grammar checking. If you write anything sensitive — legal documents, medical notes, proprietary code comments, personal journals — that’s a problem. LanguageTool is an open-source grammar, style, and spell checker that supports over 30 languages. It powers grammar checking in LibreOffice, and its commercial cloud service competes directly with Grammarly. But unlike Grammarly, you can run your own instance. Your text never leaves your network, you get unlimited checks with no word caps, and you can plug it into browser extensions, text editors, and custom applications via a clean REST API. ...

March 22, 2026 · 10 min · Self Host Setup