Grammar Checker
Fix grammar, spelling, and punctuation in any draft. Paste your text, get a corrected version plus a list of every fix, free.
What this grammar checker does
It catches the errors that spellcheck misses: subject-verb slips, punctuation problems, repeated words, and phrasing that reads wrong. Paste a paragraph or a full chapter, and get back a clean version with every change flagged and explained.
How to use it
Paste your text into the box and hit Check grammar. The corrected version appears on the right with a copy button, and the fix list below shows what changed and why. Three free checks a day covers most daily writing; Tools Pro removes the limit.
Why use this Grammar Checker instead of asking ChatGPT or Claude?
Chatbots are great for ideas. This tool is for getting the job done — here's what changes when you use it instead of pasting your text into a chat app.
| Compared to a chatbot | This tool | ChatGPT / Claude |
|---|---|---|
| Speed | Instant. No prompt, no preamble, no waiting. | Type a prompt, wait for a long reply, read through it. |
| Privacy | Runs in your browser. Nothing gets uploaded or stored. | Your text is sent to and stored by a third party. |
| Format | Consistent, copy-ready output every single time. | Different style and structure every session. |
| Signup | None. Open the page and go. | Account required, limits and paid tiers involved. |
| Cost | Free. Unlimited with Tools Pro ($4.99/mo, all 18 tools). | Free tier with limits, or $20+/mo for full access. |
Use a chatbot to brainstorm. Use this tool to finish the job — then publish with Harmony when the book is ready.
Frequently asked questions
Is the grammar checker really free?
Yes — you get 3 free checks a day with no account. Unlimited checks come with Tools Pro ($4.99/mo), which unlocks every tool on this site.
Does it explain what it fixed?
Yes. Besides the corrected text you get a list of changes with short reasons, so you learn the rule instead of just accepting the fix.
Is it safe to paste my manuscript?
Your text is sent to our server to run the check, but it is never stored or published. Use the free word counter and readability checker for work you want to keep fully in your browser.
Manuscript needs more than a grammar pass?
Harmony Publishing packages include professional editing, formatting, and distribution.
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