LanguageTool
Summary
Grammar tools that only handle English fall apart the moment a multilingual team starts writing in German, Portuguese, and Spanish in the same week. LanguageTool is built to cover that gap, checking text across 30+ languages with the same correction depth.
LanguageTool operates as a browser add-on, office plugin, and standalone editor, catching grammar, spelling, punctuation, and style errors wherever text is typed. The paraphrasing tool lets you rewrite sentences on the spot without switching to a separate application. The API gives development teams a way to pipe checks directly into internal tools or content pipelines. The ceiling appears when you need deep style enforcement: custom brand-voice rules and advanced style guidance are paid-only features, so free-tier users get error correction but not the consistency layer that brand and comms teams actually need.
Bottom line: Pick LanguageTool if your team writes across multiple languages and needs grammar checks embedded directly in the tools they already use — but plan on the paid tier the moment consistent brand voice across documents becomes a requirement, not a nice-to-have.
Pricing Plans
SubscriptionLast verified 2 weeks ago- Price
- $24.90/month
- Free Tier
- 2,000 characters per text field, basic grammar and punctuation checks, limited sentence rephrasing (3 per day)
Basic
For beginners
- 2,000 character limit per text field
- Basic grammar and punctuation checks
- Limited sentence rephrasing by A.I. (3 per day)
- Personal Dictionary
- Basic spelling suggestions
Premium - Monthly
For professionals, monthly payment
- 150,000 characters per text field
- Enhanced grammar, punctuation, and style checking
- Unlimited sentence paraphrasing powered by A.I.
- Style Guide Add-on
- Personal Style Guide
- All languages and dialects
- Text Statistics
- Picky Mode
Premium - Quarterly
For professionals, quarterly payment
- 150,000 characters per text field
- Enhanced grammar, punctuation, and style checking
- Unlimited sentence paraphrasing powered by A.I.
- Style Guide Add-on
- Personal Style Guide
- All languages and dialects
- Text Statistics
- Picky Mode
Premium - Annual
For professionals, annual payment (BESTSELLER)
- 150,000 characters per text field
- Enhanced grammar, punctuation, and style checking
- Unlimited sentence paraphrasing powered by A.I.
- Style Guide Add-on
- Personal Style Guide
- All languages and dialects
- Text Statistics
- Picky Mode
Premium - 2 Years
For professionals, 2-year payment
- 150,000 characters per text field
- Enhanced grammar, punctuation, and style checking
- Unlimited sentence paraphrasing powered by A.I.
- Style Guide Add-on
- Personal Style Guide
- All languages and dialects
- Text Statistics
- Picky Mode
Teams
For small teams of up to 20 members (2 users example: $132.80/year)
- All benefits for Premium
- User management
- Team Style Guide
- Team Dictionary
- Support for up to 20 team members
View full pricing on languagetool.org →
Pricing may have changed since last verified. Check the official site for current plans.
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Pros
Sign in to edit- Checks text in 30+ languages with automatic language detection, so multilingual teams avoid manual mode-switching when documents mix languages.
- Add-ons cover every major browser and office suite — Chrome, Word, Google Docs, Gmail, LibreOffice among them — which means writers get corrections inside the tools they already use instead of copying text into a separate checker.
- A Proofreading API is available for developer integration, so teams can embed grammar checks directly into content pipelines or internal tools without building their own NLP layer.
- The browser add-on processes text without storing it locally, the vendor states, so teams with basic data-handling requirements can deploy it without a dedicated privacy review of client-side storage.
- A personal dictionary and writing statistics are available in the editor, so writers can track error patterns over time and build vocabulary the tool does not flag incorrectly.
Cons
Sign in to edit- Advanced style suggestions, brand voice consistency rules, and unlimited paraphrasing are paid-only features. A comms or content team that deploys the free tier expecting style enforcement will find the correction layer stops at grammar and basic spelling — they either upgrade or manually enforce style in a separate pass.
- There is no self-hosted option and no downloadable binary. Organizations under strict data-residency requirements or internal security policies that prohibit sending document text to external servers cannot use LanguageTool at all, and will move to an on-premise alternative or build their own correction layer.
- The paraphrasing tool has a usage cap on the free tier. Writers who lean on it for rewriting multiple drafts per day hit the ceiling mid-session and either stop or upgrade — there is no graceful degradation that preserves partial functionality.
- API access at production volume is a paid-only feature. A team that prototypes on the free API and plans to scale will discover the rate limits before launch, requiring a billing decision they did not budget for at the start of the project.
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About
- Platforms
- Web, Chrome, Edge, Firefox, Safari, Opera, Gmail, Apple Mail, Thunderbird, Google Docs, Word, Apple Pages, LibreOffice, macOS, Windows
- API Available
- Yes
- Self-Hosted
- No
- Last Updated
- 2026-06-25T13:17:22.741Z
Best For
Who it's for
- Writers and professionals seeking error-free text
- Multilingual users needing checks in 30+ languages
- Teams requiring consistent style and brand voice
- Users wanting browser and office integrations
What it does well
- Proofreading documents and emails for grammar and style errors
- Paraphrasing sentences to improve clarity or vary wording
- Maintaining consistent brand voice in professional communications
- Integrating grammar checks into writing workflows via plugins and API
Integrations
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Frequently Asked Questions
- Is LanguageTool free?
- LanguageTool has a permanent free tier alongside paid upgrades (paid plans from $24.90/month). You can keep using a baseline version indefinitely without paying.
- Is LanguageTool open source?
- No — LanguageTool is a closed-source tool. Source code is not publicly available.
- Does LanguageTool have an API?
- Yes. LanguageTool exposes a developer API. See the official documentation at https://languagetool.org for details.
- What platforms does LanguageTool support?
- LanguageTool is available on: Web, Chrome, Edge, Firefox, Safari, Opera, Gmail, Apple Mail, Thunderbird, Google Docs, Word, Apple Pages, LibreOffice, macOS, Windows.
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LanguageTool sits between your writing surface and your reader, catching errors in real time across grammar, spelling, punctuation, and style. The core workflow is paste-or-type in the web editor, or install one of the add-ons for Chrome, Edge, Firefox, Safari, Gmail, Outlook, Google Docs, Word, or LibreOffice, and corrections surface inline without leaving the application. The browser add-on, the vendor states, stores no text locally — checks happen server-side and the result comes back to the page you are on.
The differentiating feature is language breadth. Most grammar checkers are English-first with token support for a handful of other languages. LanguageTool covers 30+ languages and dialects and automatically detects which language is in use, which means a German-English bilingual document does not require the user to switch modes manually. For organizations that publish across language markets, this removes a category of manual QA entirely.
Where LanguageTool fits best is individual writers and teams who need error correction across multiple languages baked into existing writing tools. Where it breaks: custom style rules, brand voice consistency settings, and advanced typography suggestions are locked behind the paid tier. A team running a free integration through the API will hit rate limits before reaching the correction depth a content-at-scale workflow demands. The API is available, but high-volume production use is a paid-only path.
The add-on and plugin ecosystem covers the major surfaces — Chrome, Edge, Firefox, Safari, Opera, Gmail, Outlook, Google Docs, Word, Apple Pages, LibreOffice, plus macOS and Windows desktop apps. For teams that want to embed checking in their own product, the Proofreading API is documented separately and targets developer integration rather than end-user workflows. GDPR-compliant configurations are available for business customers, the vendor states, which matters for European organizations processing employee or customer communications through a third-party writing tool.