# HumanizerPRO

> HumanizerPRO is a free AI humanizer and AI-to-human text converter. It rewrites AI-generated text (from ChatGPT, Claude, Gemini, and other LLMs) into natural, human-sounding writing that aims to read past AI detectors such as GPTZero, Turnitin, Originality.ai, and Copyleaks, while keeping the original meaning intact and producing plagiarism-free output.

Key facts:

- Anonymous (no account) users can humanize up to 500 words per request, up to 500 words total per month, resetting automatically each month.
- Creating a free account raises that to 1,000 words per request and 1,000 words per month, plus saves your history and gives faster, no-re-verification access.
- All three humanization modes (Basic, Standard and Advanced) are free for every user, including visitors without an account. Only the PRO Engine is premium.
- Paid plans (Basic, Pro, Advanced) raise per-request limits to 600 / 1,200 / 3,000 words and yearly quotas to 180,000 / 600,000 / 2,000,000 words (about 15,000 / 50,000 / 167,000 a month), and unlock the premium PRO Engine and higher limits on the AI Detector, Plagiarism Checker, and Fact Checker. Yearly prices are $7 / $12 / $19 a month, with a 3-day money-back guarantee.
- The free-standing AI Detector, Plagiarism Checker, and Fact Checker tools each have their own per-request limit, separate from the humanizer's word pool: 800 words free (AI Detector), 1,000 words free (Plagiarism Checker), 500 words free (Fact Checker); all raised substantially on paid plans.
- Supports 8 languages: English, French, Dutch, Italian, German, Spanish, Russian, and Portuguese.
- Content is processed to generate a result and is not stored or used for model training.
- A REST API is available for developers to integrate humanization, AI detection, fact-checking, and plagiarism-checking at scale, all under one API key.

## Main tools

- [AI Humanizer (homepage)](https://humanizerpro.ai/): Paste AI-generated text, choose Basic/Standard/Advanced mode and a tone, get human-sounding output.
- [Human AI Writer](https://humanizerpro.ai/human-ai-writer): Writes blog posts, essays, emails, articles, product descriptions, social posts, stories and cover letters that sound human and pass AI detectors (an undetectable AI writer). Three steps in one click: drafts from your topic and key points, humanizes the draft with the HumanizerPRO engine, then fixes issues on autopilot so the meaning stays intact. 1 free generation without an account, 1 more a month with a free account; paid plans use their monthly word balance.
- [AI Detector](https://humanizerpro.ai/ai-detector): Free AI detector (800 words per check, no sign-up; up to 5,000 on paid plans) that gives an overall AI score and highlights every sentence as likely AI, possibly AI or likely human. Score bands: under 30% likely human, 30-69% mixed, 70%+ likely AI. In HumanizerPRO's October 2026 test it rated all 60 ChatGPT (GPT-4.1) texts as AI or mixed (57 likely AI, average 90% AI) and 23 of 30 human-written texts as likely human (7 mixed, none likely AI).
- [Plagiarism Checker](https://humanizerpro.ai/ai-plagiarism-checker): Free plagiarism checker (1,000 words per scan, no sign-up; up to 5,000 on paid plans). Searches about one sentence per 40 words as an exact phrase in live Google results, opens the pages found and compares them with every sentence, then shows the share of the text found online, the matched sentences and links to the source pages. In HumanizerPRO's October 2026 test it caught 5 of 5 word-for-word Wikipedia copies (94-100%), found 3 of 3 copied paragraphs hidden at the end of original texts, and flagged nothing in 4 of 5 original texts; only 2 of 5 lightly reworded copies were partly caught. It searches the open web, not private archives such as Turnitin's.
- [Fact Checker](https://humanizerpro.ai/fact-checker): Free AI fact checker (500 words per check, no sign-up; up to 5,000 on paid plans) that splits text into claims, marks each true, false, partially true or unverifiable with an explanation, and suggests corrections you can apply in one click. Uses GPT-4.1's knowledge, not live web search. In HumanizerPRO's October 2026 test it caught all 10 planted factual errors in 20 short texts with the right correction, and confirmed 9 of the 10 correct texts as true.
- [AI Humanizer API](https://humanizerpro.ai/humanizer-api): REST API access to all four tools above, one key, developer docs, tiered pricing.

## Use cases

- Students and researchers refining AI-assisted drafts before submission
- Bloggers, marketers, and SEO professionals turning AI drafts into natural, publishable copy
- Freelancers and agencies delivering human-reading work to clients and editors
- Business teams turning AI-drafted reports and internal docs into natural writing

## Core pages

- [Homepage](https://humanizerpro.ai/)
- [Pricing](https://humanizerpro.ai/pricing)
- [Human AI Writer](https://humanizerpro.ai/human-ai-writer)
- [AI Detector](https://humanizerpro.ai/ai-detector)
- [Plagiarism Checker](https://humanizerpro.ai/ai-plagiarism-checker)
- [Fact Checker](https://humanizerpro.ai/fact-checker)
- [AI Humanizer API](https://humanizerpro.ai/humanizer-api)
- [Blog](https://humanizerpro.ai/blog): guides and reviews on AI writing, detection, and humanization
- [About](https://humanizerpro.ai/about)
- [Sitemap](https://humanizerpro.ai/sitemap.xml)

## Contact

support@humanizerpro.ai