Catch grammar mistakes, awkward phrasing, and style issues in any English text. Free, no sign-up, powered by the LanguageTool public API.
A grammar checker goes beyond spelling — it understands subject-verb agreement, verb tense consistency, comma splices, run-on sentences, passive voice, and many other grammatical patterns. LanguageTool ships with thousands of rules covering grammar, style, and common writing issues.
Paste your text and click Check. The LanguageTool API analyses every sentence, returns matches with categories (grammar, style, typos, redundancy, register), and the tool renders them inline-highlighted plus a numbered list with suggested replacements.
Use it before publishing blog posts, before sending professional emails, before submitting essays or applications, before posting to LinkedIn, and before printing any client-facing document. The 20 free checks per minute per IP is plenty for most users.
Don't blindly accept every suggestion — LanguageTool is conservative and sometimes flags stylistic choices that are intentional. Read the explanation tooltip before accepting. For specialised technical or legal writing, the suggestions may not apply.
LanguageTool is the leading open-source alternative. Free coverage is comparable; Grammarly Premium has more nuanced suggestions.
Yes — there's no character limit on the public API for one-off checks. Rate limit is 20 requests per minute.
Yes — change language code to en-GB if your site targets UK audiences.
Explore more grammar & proofreading on the tool hub — or jump straight to the Spell Checker, Punctuation Checker, Online Proofreader.