LanguageTool is a free online proofreading service that offers comprehensive grammar and spelling checks in over 30 languages. It provides an AI-based grammar checker, personal dictionary, and quality scoring for texts. The platform supports various browsers like Chrome, Edge, Firefox, Safari, and Opera, along with Office plugins for Google Docs, Word, OpenOffice, and LibreOffice.

Premium users of LanguageTool gain access to advanced features such as a rephrasing tool, Picky Mode for punctuation, and style suggestions. Trusted by prominent organizations like BMW Group and Amazon, LanguageTool is a reliable tool for individuals and businesses looking to enhance their writing. It also offers a 20% discount on its Premium version.