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Grammar Checker

Paste text, get corrections with reasons — grammar, punctuation, spelling, style. Every change explained.

  • AI powered
  • Server processed
  • Free
  • No signup
Paste text to check 0 chars

🔒 Your text is sent to our API + Anthropic's Claude API for correction, then discarded. Nothing is logged.

This tool sends your input to an AI model on our server to produce a result.

How to use Grammar Checker

  1. Paste your text into the box (up to 20,000 characters — about 3,500 words).
  2. Click Check grammar. Claude reviews for grammar, punctuation, spelling, and basic style errors — but does NOT rewrite for tone or clarity.
  3. Read the change list. Each change shows the original phrasing, the correction, the category (grammar / punctuation / spelling / style), and a short reason.
  4. Copy the corrected version with one click, or accept individual changes by editing the original manually.

Common use cases

  • Emails before sending. Quick check on important emails — customer emails, cover letters, apology emails. Fixes typos and grammar without changing your voice.
  • Blog posts and articles. Free alternative to Grammarly for the final pre-publish check. Shows the changes so you learn what you get wrong.
  • Resume and cover letters. A single grammar error can knock a resume out of consideration. Check yours before applying.
  • Non-native English writers. Article usage (a/an/the), preposition choice, and verb tense are the most common non-native errors. The change list explains each fix so you can learn the pattern.
  • Academic writing. Fixes surface errors so reviewers focus on your ideas, not your typos.

Tips

  • The tool intentionally does NOT rewrite for style, clarity, or tone. If you want a full rewrite, use the AI Humanizer or Paraphraser instead.
  • For long documents, split by section — accuracy is best under ~1,000 words per request.
  • The change categories help you learn: if 90% of your errors are 'punctuation', focus your English study there.
  • For creative writing, review each change — sometimes 'errors' are intentional stylistic choices you want to keep.

Troubleshooting

It missed an error I know is there.
Claude is very good but not perfect. For critical work (legal, medical), have a human copyeditor do a final pass.
It flagged something that's not an error.
Grammar rules aren't universal — some things are 'wrong' in American English but standard British English (or vice versa). Ignore individual changes that don't apply.

Frequently asked questions

Is my text stored?
No. Zero-retention.
Does it work for languages other than English?
Best on English, but Claude also handles Spanish, French, German, Portuguese and other major languages well.
How is this different from Grammarly?
Grammarly runs its own trained models and offers a browser extension. This tool uses Claude, is one-shot (paste-and-check), and explains every change with a reason. Free, no signup. If you need real-time as-you-type checking, Grammarly's extension is better; for a periodic quality check, this is faster.
Character limit?
20,000 characters per request.
Can I run this in an editor?
Yes — call /api/v1/grammar-fix from your editor or CI/CD. Same free rate limits.