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What is LanguageTool?
LanguageTool is an AI grammar, spelling and style checker that reviews text in more than 30 languages and dialects, with English, Spanish, German, French, Dutch and Portuguese as its main languages. It started as an open-source project in Europe and is now used by millions of people and more than 2,000 organizations, including outlets such as Der Spiegel and the dpa news agency.
Which mistakes does LanguageTool catch?
It flags spelling errors, agreement problems, wrong tenses, incorrect word order and unnatural word combinations. It is particularly precise with punctuation: it tells required commas from optional ones and points out the unnecessary ones. For style it highlights repetition, overused phrases, wordiness, informal tone and foreign terms, and Picky Mode adds stricter typography suggestions. In English you can pick between six regional varieties.
Where can you use LanguageTool?
- Add-ons for Chrome, Edge, Firefox, Safari and Opera that check your writing on any website.
- Plugins for Google Docs, Microsoft Word, Apple Pages and LibreOffice.
- Integration with Gmail, Outlook, Apple Mail and Thunderbird.
- Desktop apps for Windows and macOS plus its own web editor.
- Automatic language detection with no manual switching.
- A proofreading API to build it into your own products.
Can LanguageTool rewrite sentences too?
Yes. It includes an AI paraphraser that rewrites a sentence to be more formal, fluent, simple or concise, plus a thesaurus that appears when you double-click a word. Statistics show which languages you use, which mistakes you repeat and how many suggestions you accept, which helps you improve over time.
Who is LanguageTool for?
For students writing papers or theses, professionals writing emails and reports in several languages, writers and translators, and companies that need a shared style guide and dictionary. The team version is GDPR compliant, which matters for European organizations.
LanguageTool pros and cons
- Pro: strong quality in Spanish and other European languages, not just English
- Pro: works in the browser, in Office, in Google Docs and in email
- Pro: browser add-ons do not store the checked text
- Con: the most advanced style and punctuation checks are reserved for Premium
- Con: it sometimes flags correct but unusual constructions as errors
LanguageTool features and use cases
How to use LanguageTool
LanguageTool FAQ
What is LanguageTool?
LanguageTool is an AI grammar, spelling and style checker that reviews text in 30+ languages, including Spanish.
Is LanguageTool free?
Yes, there is a free basic version that fixes spelling and simple mistakes; Premium catches every issue. See the pricing section of this page for details.
Does LanguageTool work in Spanish?
Yes. Spanish is one of its main languages, and it also checks Catalan, English, German, French, Portuguese and more.
Does it work in Word and Google Docs?
Yes. There is a Microsoft Word add-in and it works in Google Docs, as well as Apple Pages and LibreOffice.
Does LanguageTool have an API?
Yes. It offers a proofreading API for businesses and developers, and its core is open source.
Does it store my texts?
LanguageTool says the browser add-on does not store checked texts; texts in the web editor are stored securely in your account.
Is it good for proofreading a thesis?
Yes. Its style checks help with academic writing, and students get a discount.
Does it include a paraphraser?
Yes. It includes an AI paraphraser to make sentences more formal, fluent, simple or concise.
What are the best LanguageTool alternatives?
On GptZone you can compare Grammarly, QuillBot and ProWritingAid, other AI proofreading and writing assistants.
LanguageTool pricing and plans
Reference price: 19.9 EUR / month. Source · Verified: October 30, 2026
Prices in euros (EUR), VAT included. Checked on: 30/10/2026.
Basic: €0; fixes spelling, simple punctuation and some style issues.
Premium: €19.90/month billed monthly, €39.89 per quarter, €59.90 per year or €99.90 every two years; advanced checks, up to 150,000 characters per field, unlimited paraphrasing and style guide.
Teams: from €119.80 per year for 2 users, with user management, team style guide and dictionary.
Promotion running when checked: 20% off Premium (€15.92/month billed monthly) and 24% off Teams. Discounts for students and non-profits.
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