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Basic Grammar Checker
- Browser-based
- No signup
Browser-based
Paste English text to get grammar, spelling, punctuation, and clarity suggestions in your browser. Choose an English dialect, apply one-click fixes, and keep your writing private—text is never uploaded. Powered by the offline Harper engine, not a cloud AI model.
Suggestions come from an offline grammar engine. Coverage is helpful for drafts but is not a substitute for a human editor or professional proofreading.
How to use this tool
1. Paste English text into Basic Grammar Checker. 2. Choose your English dialect (American, British, Australian, Canadian, or Indian). 3. Review grammar, spelling, punctuation, and clarity suggestions as they appear. 4. Apply one-click fixes for individual issues. 5. Re-read the text before publishing—suggestions come from an offline engine, not a full AI writing assistant. Processing runs in your browser; text is not uploaded to our server.
Worked example
Example: paste a short paragraph with a common typo, review the highlighted issue, apply the suggested fix, and confirm the sentence still reads naturally.
How it works
Paste or type English text and choose a dialect. Harper’s offline grammar engine runs in your browser and lists grammar, spelling, punctuation, and clarity suggestions with optional one-click fixes. Text is not uploaded to a server.
Limitations
Suggestions come from an offline grammar engine. Coverage is helpful for drafts but is not a substitute for a human editor or professional proofreading.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Frequently asked questions
Is my text uploaded to a server?
No. Grammar checking runs entirely in your browser with the offline Harper engine. Text is not uploaded or stored.
What kinds of issues are detected?
Suggestions can include grammar, spelling, punctuation, agreement, repetition, and clarity issues. Coverage is helpful for drafts but is not a substitute for a human editor.
Which English dialects are supported?
You can check American, British, Australian, Canadian, or Indian English.
Part of these workflows
This tool is one step in a longer job. Follow a workflow guide to see what to do before and after.
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