LanguageTool
LanguageTool is a grammar and spell-checking tool that supports more than 30 languages. It can proofread grammar, punctuation, capitalization and style, provide AI rewriting, and offer browser extensions, email and office plug-ins, desktop applications and proofreading APIs.
Updated: 2026-10-26
What is LanguageTool?
LanguageTool is a multilingual writing and proofreading tool. Its official website positions itself as "more than just a grammar checker". In addition to spelling and grammar, it covers punctuation, capitalization and style. Its highlight is the wide coverage of languages: the meta description states that it supports more than 30 languages. The language list includes multiple country variants of English, three regional variants of German, four variants of Portuguese, etc., and Chinese is also among them. In addition to the web version, the official provides browser extensions, email plug-ins, office plug-ins and desktop applications, and offers enterprise-oriented solutions and proofreading APIs.
Who is it for?
- People who write papers, emails, or reports in a non-native language and need to first proofread their grammar and spelling
- Multilingual writers who need to switch proofreading rules between English variants and German variants
- Editors and content teams conduct initial screening of manuscripts using unified rules
- Developers who need to integrate proofreading capabilities into their own products
- Enterprises with data compliance requirements who wish to use compliant or self-deployable solutions
- A final self-check for students before writing English homework or application essays
Key features
6Grammar Check
Identifies grammatical errors in text and helps find an appropriate tone, and the official states that it supports cross-lingual proofreading.
Spelling and Punctuation
The official website lists capabilities such as correcting spelling, checking punctuation, and confirming capitalization, covering the most error-prone basic items in foreign language writing.
Style Improvement
In addition to basic proofreading, it provides style-oriented revision suggestions. The official lists this as an independent feature to address wordiness, repetition, and dull expression.
Rewriting Tool
The official Paraphrasing Tool allows you to rewrite any sentence as needed, and the Premium version offers unlimited rewrites.
Multi-platform Plugins
Provide browser extensions for Chrome, Edge, Firefox, Opera, email plugins for Gmail, Apple Mail, and Thunderbird, office plugins for Google Docs, Word, Apple Pages, and LibreOffice, as well as desktop applications for macOS and Windows.
Statistics and Enterprise Solutions
The official website provides writing statistics functions; it offers GDPR-compliant solutions and Proofreading API for enterprises, and states that more than 2,000 organizations use its writing tools.
How to use LanguageTool
- First determine the language variant before starting proofreading.
- The regional variant rules for British English, American English and German are different.
- choosing the wrong one will result in a batch of false positives.
- Install the browser extension to check your writing on the go on web pages, emails and documents—it’s more convenient than copying text into the web version.
- The rewriting tool is good for breaking repetitive sentence structures, but you should read through the revised text yourself.
- machine rewriting tends to flatten the tone and professional terms.
- The free version has restrictions on text length and the number of rewrites, so it is recommended to check long documents paragraph by paragraph.
- The benefits of Premium and the discounts displayed on the official website are promotional information.
- please refer to the instructions on the current page before purchasing.
- For texts involving contracts, paper authorship and external release, the proofreading results are for reference only, and key expressions still need to be manually confirmed.
- For enterprise users involved in data outbound and compliance requirements, confirm the data processing method of the selected solution before uploading content.
Traffic & popularity
Data month Sep 2026
LanguageTool receives about 11.7M visits per month and ranks #7,106 worldwide.
Monthly visits
12 monthsTraffic sources
- Direct59.9%
- Search28.1%
- Social4.5%
- Referrals4.4%
- Mail1.1%
- Other1.9%
Top countries
- Brazil15.2%
- Germany14.6%
- United States9.6%
- Spain6.9%
- Colombia5.9%
Estimated from third-party traffic data.
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