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LanguageTool

LanguageTool

An open-source multilingual grammar, spelling, and style assistant for better writing across platforms

Rewrite & ProofreadingGrammar CheckerWriting AssistantMultilingualTrial

LanguageTool is a cross-platform multilingual writing assistant for grammar, spelling, style, and rewriting. It supports 30+ languages through browser, desktop, Word, Google Docs, and API integrations, with a strong focus on privacy.

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Updated

2026-10-22

Platforms

Web / Browser Extension / Desktop / API

Freemium

Free: available at no cost, with checks of up to 10,000 characters at a time and basic spelling and grammar corrections.Premium: approximately $4.99–$5.83/month when billed annually or for two years; monthly billing can be about $24.90/month. Premium adds AI sentence rewriting, deeper style improvements, and formatting suggestions.Team: approximately $5–$9/seat/month, with shared team dictionaries and centralized account management. Prices may vary by billing term and promotion.

* Pricing is for reference only; see the official site for current pricing.

LanguageTool
languagetool.org

LanguageTool Key Features

  • Multilingual proofreading

    Identify common language errors across supported languages as you write.

  • Style rewriting

    Rewrite sentences and refine tone, style, and readability.

  • Cross-platform access

    Use browser extensions, desktop apps, Word, Google Docs, and APIs.

  • Long-text review

    Review longer content for punctuation, grammar, formatting, and clarity issues.

LanguageTool Best For

Multilingual writers and international teams

Check emails, documents, and social content in multiple languages while improving professional accuracy.

Creators, editors, and students

Find spelling, punctuation, and grammar issues in long texts and rewrite sentences for clarity.

Customer support and business communication teams

Standardize tone and reduce language errors in high-volume replies and customer-facing documents.

Pros

  • Supports a broad range of languages
  • Available across browsers, desktop, documents, and API
  • Offers a privacy-focused open-source option

Considerations

  • Free checks have character limits
  • Advanced rewriting requires Premium
  • Language quality and features vary by language

LanguageTool Quick Start and Practical Tips

Quick start

  1. 1

    Set the document language explicitly; auto-detection misreads short or mixed-language text and reports false errors.

  2. 2

    Add recurring proper nouns to the personal dictionary instead of dismissing them on every check.

  3. 3

    Self-host the open-source server with an nGram data set when documents cannot leave your network.

Pro tip

Core tip: rules are stricter than a human editor. Style suggestions flag passive voice and long sentences that may be intentional in legal or academic text, so disable those rule categories per document type. Free checks cap characters, which means long files get truncated silently.

LanguageTool Alternatives

If this tool is not the right fit, explore these alternatives