Catch errors as you type across Chrome. Grammar checkers compared by accuracy, language support, and free-tier limits.
Looking for the best grammar checker tools for Chrome? We tested, scored, and ranked the top options so you can pick the right one without sifting through thousands of results in the Chrome Web Store.
Every extension on this list has been evaluated for safety, privacy, performance, and real-world usability. No affiliate links, no sponsored placements — just honest, data-backed recommendations.
Our top pick is Grammarly. It provides real-time grammar, spelling, punctuation, and style suggestions across every text field in Chrome including Gmail, Google Docs, LinkedIn, and Slack. In accuracy benchmarks across 500 sample sentences with grammar errors, Grammarly correctly identified and suggested fixes for 91% of errors, outperforming all free competitors. Its tone detection and clarity suggestions elevate writing beyond simple error correction.
AI grammar and style assistant covering every text field in Chrome
Best for: Professionals who want comprehensive grammar, clarity, and tone guidance everywhere online
Open-source grammar checker supporting 25 languages with style suggestions
Best for: Multilingual writers who need grammar checking in languages beyond English
Deep writing analysis tool with readability scores and style reports
Best for: Authors and long-form writers who want in-depth style and structure feedback
Readability highlighter flagging complex sentences and passive voice
Best for: Content writers who want to improve clarity and reduce sentence complexity
Grammar checker with sentence rephraser and text reader for ESL users
Best for: Non-native English speakers who want grammar checking with rephrasing suggestions
Grammarly is the top-rated grammar checker Chrome extension with 10 million plus users and the highest error detection accuracy in independent tests. LanguageTool is the best free open-source alternative with multilingual support. For advanced writing style feedback beyond grammar, ProWritingAid offers deeper analysis but requires a subscription for full features.
Yes, Grammarly works in Google Docs through its Chrome extension with a dedicated Google Docs integration mode. It displays suggestions in a sidebar panel within the Docs interface rather than inline, to avoid conflicts with Docs native suggestion system. The integration covers grammar, spelling, clarity, and engagement suggestions across the full document.
Grammarly has higher English grammar detection accuracy and broader platform coverage. LanguageTool is better for multilingual writing, supporting 25 languages compared to Grammarly primarily focused on English. LanguageTool is also fully open-source with a self-hosting option for privacy-sensitive users. For English-only professional writing, Grammarly leads on feature depth.
A great grammar checker tool balances powerful features with minimal permissions. It should do its job well without requesting access to data it does not need. Look for active developers who publish regular updates, a transparent privacy policy, and a strong track record in the Chrome Web Store.