LanguageTool

LanguageTool is an AI grammar checker and writing assistant for individuals and teams, checking spelling, grammar, punctuation, style, and word choice in 30+ languages across browser, office, desktop, and web tools.

Writing Assistants AI Grammar Checker

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Overview

LanguageTool is an AI-based grammar checker and writing assistant that helps users find and fix spelling, grammar, punctuation, style, and word-choice issues. It works across more than 30 languages and dialects, including major languages such as English, German, Spanish, French, Dutch, and Portuguese.

The product is available as a browser add-on, a dedicated editor, desktop support for Windows and macOS, and integrations for tools such as Microsoft Word, Google Docs, and LibreOffice. The site also highlights a paraphrasing tool and a statistics feature for tracking writing activity and suggestions applied.

Core features

Grammar and spelling checking

LanguageTool checks for grammar, spelling, punctuation, style, and casing issues, with examples on the site showing word order, tense, comma, and agreement corrections.

Dedicated writing editor

The editor offers a distraction-free writing space, a personal dictionary, statistics, and a dark/light appearance option for users who want to write inside LanguageTool itself.

Browser add-on for web writing

The browser add-on works while typing on the web, automatically detects the language of the text, and does not store text according to the site.

Desktop app support

LanguageTool is available for Windows and macOS and is shown working in apps such as Outlook, WordPad, Notepad, Pages, Mail, Slack, Word, Notes, and Messages.

Office suite integrations

The service integrates with Google Docs, Microsoft Word, and LibreOffice, and the Word page says the add-in works with Windows, Mac, and the online version of Word.

AI paraphrasing

The paraphrasing tool can rewrite sentences in different tones such as formal, concise, fluent, or simple, and the pricing page describes unlimited sentence paraphrasing for Premium.

Common use cases

Writing on the web
Use the browser add-on to catch grammar and spelling issues while drafting emails, blog posts, or social media text directly in the web app you are already using.
Drafting and reviewing longer text
Use the dedicated editor when you want a focused writing space with statistics, a personal dictionary, and configurable display options.
Editing documents in office apps
Use the Word, Google Docs, or LibreOffice integrations when you need proofreading inside office documents, essays, letters, or other document-based workflows.
Rewriting sentences and paragraphs
Use the paraphrasing tool when you want to rephrase a sentence to sound more formal, fluent, simple, or concise.
Maintaining team consistency
Use the team features when an organization needs shared wording rules and a common dictionary for consistent text across multiple writers.

Pros and Cons

Pros

Covers grammar, spelling, punctuation, style, casing, and word choice in one tool.
Supports more than 30 languages and dialects, with multiple English varieties.
Works in the browser, in a dedicated editor, and through desktop and office integrations.
Offers automatic language detection in the browser add-on and inline suggestions while typing.
Includes team-oriented features such as shared style guides and dictionaries in the pricing page.

Cons

Some capabilities are framed as Premium-only, including fuller style and punctuation checking and unlimited sentence paraphrasing.
The site does not list every supported app or workflow in one place, so integration details are spread across multiple pages.

FAQ

Is LanguageTool free?

Yes. The free version corrects spelling, simple punctuation, and some style mistakes. Premium is described as showing all errors and providing the best possible text.

Does LanguageTool work in the programs I already use?

LanguageTool works in common internet browsers through extensions and add-ons, and the site also points to dedicated apps and integrations such as Word and LibreOffice.

Which languages can LanguageTool check?

LanguageTool supports more than 30 languages and dialects. The site highlights English, Spanish, German, French, Dutch, and Portuguese as main languages, and offers six English varieties in the English version.

How does LanguageTool show suggestions?

Error cards appear automatically while you type. You can also double-click a word to see synonyms.

Can organizations use LanguageTool as a team?

The product page says team accounts are available for companies, and the pricing page includes a Teams plan with shared style and dictionary features.

Quick Facts

Category: AI grammar checker
Platforms: Web, browser add-ons, Windows, macOS, Microsoft Word, Google Docs, LibreOffice
Languages: 30+ languages and dialects
Primary users: Individuals, writers, and teams
Pricing: Free version available; Premium and Teams plans are offered
Website: languagetool.org