Grammar and Spell Checker - LanguageTool

Grammar and Spell Checker - LanguageTool

With this extension you can check text with the free style and grammar checker LanguageTool. It finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word.

Grammar and Spell Checker - LanguageTool promo image
What is Grammar and Spell Checker - LanguageTool?

"Grammar and Spell Checker - LanguageTool" is a Firefox add-on that allows you to check your texts for spelling and grammar errors across the internet. It works on almost any website and supports more than 25 languages. The extension uses advanced techniques to detect numerous errors that traditional spell checkers may miss. It's user-friendly, working real-time as you type and provides style suggestions to elevate your writing. It respects your privacy, by securely sending your texts for check without storing your IP address or requiring registration.

Stats date:
Version: 8.3.0 (Last updated: 2023-11-28)
Creation date: 2016-06-10
Weekly download count: 28,503
Firefox on Android: No
Manifest version: 2
  • activeTab
  • storage
  • contextMenus
  • alarms
Size: 11.17M
Risk impact: High risk impact
Risk likelihood: Very low risk likelihood

Other platforms

Grammar Checker & Paraphraser – LanguageTool
Grammar Checker & Paraphraser – LanguageTool (v8.3.0)
4.83 (10,053) 2,975,728

Check your texts for spelling and grammar problems everywhere on the web

★ Finds many errors that a simple spell checker cannot detect ★ No registration needed ★ Supports more than 25 languages (see below) ★ Works on almost any website including Gmail, Facebook, Twitter

This free extension ensures that your writing is error-free via the grammar and style checker LanguageTool. LanguageTool detects many errors that a simple spell checker cannot, such as grammar issues, commonly confused words, and punctuation oversights. Additionally, LanguageTool offers style suggestions to elevate your writing: synonym replacements for overused words, concise rephrasing of wordy sentences, and formal alternatives to commonly used expressions.

LanguageTool is designed with simplicity in mind, instantly analyzing your text as you type. It is compatible with most platforms, including social networks such as Twitter and LinkedIn, and e-mail services such as Gmail.

With LanguageTool, our aim is to give users a full-feature grammar checker and proofreader that will enable them to have control and confidence over their content. While LanguageTool is a vital extension for non-native speakers, it also recognizes many mistakes that are frequently made by native speakers. This grammar and spelling correction works across several varieties of commonly spoken languages, and is capable of distinguishing between American and British English. LanguageTool also features a personal dictionary for exceptions or words that you might commonly use, but are not found in a conventional dictionary; it will learn to recognize these words for future grammar checking and proofreading.

Unlike other services like Grammarly (a.k.a. Grammerly :-), QuillBot, and Ginger, LanguageTool supports more than 25 languages including English, Spanish, French, German, Polish, and Russian (see below for the complete list).

See more
User reviews
User reviews summary
These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
  • Easy to use
  • Privacy-focused and open-source
  • Better than Grammarly
  • Helpful in writing and checking errors
  • Makes daily life easier and workflow faster
  • Not wanting an AI tool
  • Lack of certain words in the dictionary
  • Block built-in browser check
  • Inability to disable LT on fields with a specific ID or class name
Most mentioned
  • Grammar and spelling check
  • Improvement over time
  • AI characteristics
  • Free version limitations
  • Helpful for multilingual users
View all user reviews
Risk impact

Grammar and Spell Checker - LanguageTool is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Grammar and Spell Checker - LanguageTool if you trust the publisher.

Risk likelihood

Grammar and Spell Checker - LanguageTool has earned a good reputation and can be trusted.

Upgrade to see risk analysis details