AI Humanizer & Document Tools | HumanPen

What

HumanPen is a document-level AI humanizer aimed at researchers, academics, and professional writers whose manuscripts are flagged by AI-detection tools. Its distinguishing approach is to rewrite only the passages identified in an imported Turnitin or iThenticate report, rather than reprocessing an entire file. It is positioned as a formatting-preserving editing tool for long, citation-heavy documents such as theses, reports, and technical papers.

Features

• Detection-report targeting: Import a Turnitin or iThenticate AI report so only flagged passages are rewritten, with an option to select passages manually instead.
• Credits charged on rewritten words only: Pricing is word-based (1,000 words costs 100 credits), and registration includes 100 free credits, so untouched text is not billed.
• Free re-check rounds below the threshold: If a re-check still shows 20% or higher AI detection, importing the new report rewrites the remaining flagged passages at no additional credit cost.
• Protected content: Numbers, units, formulas, citations, terminology, and the strength of a claim are kept as written, and the tool states it does not insert deliberate typos or grammar errors.
• Format and length retention: DOCX, PPTX, and TXT files are accepted with no word limit, and styling, bold, links, tables, and numbering are returned intact.
• Agent access: Skill, MCP, and API access are documented, including a zero-config Skill install path and invocation from tools such as Claude Code, Codex, and Cursor.
• Companion tools: The site navigation also lists Condense, Citation Fix, and Translate, though the page provides no detail on how these operate.

Helpful Tips

• Confirm your institution's or journal's policy on AI-assisted rewriting and on detector reports before relying on this workflow; the page documents rewriting behavior, not compliance approval.
• Import the report generated for the exact file version you intend to submit, since targeting depends on matching flagged passages to that document.
• Use the free re-check rounds to measure how many passes a typical chapter requires before committing to a credit purchase; cost scales with flagged word count, not total document size.
• Pilot on one section first and manually verify that protected elements, such as equations and reference formatting, survived the rewrite before processing a full manuscript.