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LanguageTool

Multilingual grammar and style checker with AI sentence rephrasing

Overview

LanguageTool checks grammar and style across more than 30 languages, which makes it the practical pick for teams publishing in several markets. Its AI paraphraser rewrites sentences into five tones without a separate tool. The public HTTP API and the self-hosted option let you embed proofreading directly into a CMS or publishing workflow.

Key Features

  • Grammar, spelling, and style checks in 30+ languages
  • AI paraphraser with five tone modes (formal, concise, fluent, simple, general)
  • Checks texts up to 150,000 characters on Premium
  • Public HTTP API and self-hosted server option
  • Browser extension, Google Docs, and MS Word integrations