AI Copyeditor

Enhance your writing with AI-powered suggestions and edits.

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Last updated: March 2026 · By John Bowman - questions? Connect on LinkedIn.

The AI Copyeditor reviews and improves your writing - fixing grammar, tightening sentences, adjusting tone and enforcing consistent style. Paste any article or upload a .txt, .doc or .docx file, configure your preferences in the Advanced Options, and click Analyse Article. Results appear in seconds.

The tool runs on Claude Haiku by Anthropic. Your text is sent securely to Anthropic's API for processing and is not stored or used to train AI models. The tool complies with UK GDPR and the Anthropic Privacy Policy as of March 2026. Always review the output before publishing - treat it as a strong second draft, not a final one.

Frequently Asked Questions
What does the AI Copyeditor actually change in my text?
It corrects grammar and spelling, improves sentence clarity, adjusts tone to match your chosen writing style, and restructures awkward phrasing. It does not fact-check or add new information. The output is your article improved, not rewritten from scratch.
Which AI model does this tool use?
The tool uses Claude Haiku by Anthropic - specifically the claude-haiku-4-5 model. Anthropic is an AI safety company and Claude is their primary language model family, designed to follow detailed instructions reliably.
Is my text stored or used to train the AI?
No. Your text is sent to Anthropic's API to process your request and is not retained or used for training. See the Anthropic Privacy Policy for full details. JohnB.io does not log or store the content you submit.
What file types can I upload?
The tool accepts .txt, .doc and .docx files. Word documents (.docx) are recommended for best formatting fidelity. The text content of your document is extracted on upload - embedded images and tables are not processed.
Will the edited article pass AI detection tools?
Not reliably. If the AI rewrites significant portions of your text, those sections may be flagged by detectors such as GPTZero or Originality.ai. Review the output and rewrite anything that does not sound like you before publishing.
How It Works
  1. Paste your article into the text area, or click Choose File to upload a .txt, .doc or .docx file directly.
  2. Optionally expand Advanced Options to set your preferred language (UK or US English), writing style (Conversational, Professional, Persuasive and more), a brand style guide, any words or characters to exclude, and a target article length.
  3. Click Analyse Article. Your text is sent to Claude Haiku, which copyedits it according to your settings.
  4. Review the results. The edited article appears in the Results section. Compare it with your original and accept or discard individual changes as you see fit.
  5. Download your edited article as a TXT or DOCX file, ready to paste into your CMS or share with a client.
Key Points
  • UK and US English supported. Switch between British and American spelling and punctuation conventions in Advanced Options - useful if you publish for different regional audiences.
  • Ten writing styles available. From Conversational and Persuasive to Analytical and Narrative - the tool adapts tone and structure to match your goal rather than imposing a single house style.
  • Brand style guide input. Paste your own style guidelines into the Advanced Options and the tool will respect them during editing. Useful for maintaining consistent brand voice at scale.
  • Handles long-form content. The tool accepts full-length articles. Use the article length selector to target a specific word count or summarise longer pieces.
  • Export-ready output. Download edited articles as TXT or DOCX with one click - no copy-paste formatting issues.
Sources
  1. Anthropic - Claude Haiku model overview. Anthropic.com. Accessed March 2026.
  2. Anthropic Privacy Policy. Anthropic.com. Accessed March 2026.
  3. ICO - UK GDPR guidance and resources. Information Commissioner's Office. Accessed March 2026.
  4. University of Oxford Style Guide. University of Oxford. Accessed March 2026.
  5. Google Search Central - SEO Starter Guide. Google Developers. Accessed March 2026.