AI Text Humanizer API

Make AI Writing Sound Human. Instantly.

---

Paste in ChatGPT output. Get back text that reads like a human wrote it. Every response includes AI detection scores before and after so you can see the difference yourself.

12-pass algorithmic engine. Zero external API calls. No GPT wrapper. No rate limits from OpenAI. Just fast, deterministic humanization at $0.003 per text.

"I ran my blog post through this and GPTZero went from 94% AI to 22% likely human. Three-tenths of a cent." -- early tester

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Before & After

	AI-Generated Input	Humanized Output
Text	Furthermore, it is important to note that artificial intelligence has significantly impacted the landscape of modern technology. Additionally, this paradigm shift serves as a testament to the rapidly evolving nature of cutting-edge innovation. In conclusion, leveraging these robust solutions provides a comprehensive overview of the competitive advantage organizations can obtain.	Look, AI has made a real difference in modern tech. What's more, this big change shows what's possible with fast-changing innovation. Basically, using these solid solutions gives you a full breakdown of the edge organizations can get.
AI Score	87/100 -- ai_generated	31/100 -- likely_human
Verdict	Robotic. Formulaic. Obviously AI.	Natural. Varied. Reads like a person.

56-point drop in AI detection. Same meaning. One API call.

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How It Works

flowchart LR
    A["AI Text Input"] --> B["Detect AI Score\n(9-factor analysis)"]
    B --> C["12 Humanization\nPasses"]
    C --> D["Re-Score Output\n(verify improvement)"]
    D --> E["Return Result\n+ before/after scores"]

    style A fill:#ff6b6b,color:#fff
    style B fill:#ffa94d,color:#fff
    style C fill:#51cf66,color:#fff
    style D fill:#339af0,color:#fff
    style E fill:#845ef7,color:#fff

The 12-Pass Humanization Engine

flowchart TB
    subgraph "Phase 1: Pattern Removal"
        P1["Pass 1: AI Phrase Replacement\n40+ phrases → natural alternatives"]
        P2["Pass 2: Contraction Injection\nit is → it's, do not → don't"]
        P3["Pass 3: Style Vocabulary\nAdjust tone for chosen style"]
    end

    subgraph "Phase 2: Rhythm & Structure"
        P4["Pass 4: Sentence Length Variation\nBreak long sentences, merge short ones"]
        P5["Pass 5: Starter Diversification\nVary how sentences begin"]
        P6["Pass 6: Comma Density Reduction\nRemove AI's excessive comma patterns"]
    end

    subgraph "Phase 3: Human Touch"
        P7["Pass 7: Imperfection Injection\nParentheticals, dashes, asides"]
        P8["Pass 8: Formal → Casual Words\nutilize → use, obtain → get"]
        P9["Pass 9: Burstiness Introduction\nVary sentence complexity"]
    end

    subgraph "Phase 4: Polish"
        P10["Pass 10: Structure Pattern Breaking\nStop repetitive X is Y patterns"]
        P11["Pass 11: Readability Adjustment\nTarget natural grade level"]
        P12["Pass 12: Final Cleanup\nRemove artifacts, smooth flow"]
    end

    P1 --> P2 --> P3 --> P4 --> P5 --> P6 --> P7 --> P8 --> P9 --> P10 --> P11 --> P12

    style P1 fill:#ff6b6b,color:#fff
    style P2 fill:#ff8787,color:#fff
    style P3 fill:#ffa8a8,color:#fff
    style P4 fill:#ffa94d,color:#fff
    style P5 fill:#ffc078,color:#fff
    style P6 fill:#ffd8a8,color:#fff
    style P7 fill:#51cf66,color:#fff
    style P8 fill:#69db7c,color:#fff
    style P9 fill:#8ce99a,color:#fff
    style P10 fill:#339af0,color:#fff
    style P11 fill:#4dabf7,color:#fff
    style P12 fill:#74c0fc,color:#fff

---

Quick Start

cURL -- Humanize in One Line

$curl "https://george-the-developer--ai-text-humanizer-api.apify.actor/humanize?text=Furthermore%2C%20it%20is%20important%20to%20note%20that%20artificial%20intelligence%20has%20significantly%20impacted%20the%20landscape%20of%20modern%20technology."

JavaScript / Node.js

// Humanize a single text
const response = await fetch(
  'https://george-the-developer--ai-text-humanizer-api.apify.actor/humanize',
  {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Authorization': 'Bearer YOUR_APIFY_TOKEN'
    },
    body: JSON.stringify({
      text: 'Furthermore, it is important to note that artificial intelligence has significantly impacted the landscape of modern technology.',
      style: 'casual',        // casual | professional | academic | creative | technical
      aggressiveness: 'medium' // light | medium | heavy
    })
  }
);

const result = await response.json();
console.log(result.humanized);
// "Also, AI has made a real difference in modern tech."

console.log(result.detection);
// { before: { score: 87, verdict: 'ai_generated' },
//   after:  { score: 31, verdict: 'likely_human' },
//   improvement: 56 }

Python

import requests

result = requests.post(
    'https://george-the-developer--ai-text-humanizer-api.apify.actor/humanize',
    headers={'Authorization': 'Bearer YOUR_APIFY_TOKEN'},
    json={
        'text': 'Furthermore, it is important to note that artificial intelligence has significantly impacted the landscape of modern technology.',
        'style': 'professional',
        'aggressiveness': 'heavy'
    }
).json()

print(f"Before: {result['detection']['before']['score']}/100 ({result['detection']['before']['verdict']})")
print(f"After:  {result['detection']['after']['score']}/100 ({result['detection']['after']['verdict']})")
print(f"Humanized: {result['humanized']}")

Bulk Processing (Up to 20 Texts)

const response = await fetch(
  'https://george-the-developer--ai-text-humanizer-api.apify.actor/humanize/bulk',
  {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Authorization': 'Bearer YOUR_APIFY_TOKEN'
    },
    body: JSON.stringify({
      texts: [
        { text: 'First AI paragraph here...', style: 'casual' },
        { text: 'Second AI paragraph here...', style: 'professional' },
        { text: 'Third AI paragraph here...', style: 'academic' }
      ],
      aggressiveness: 'medium'
    })
  }
);

const { results, total } = await response.json();
// results[0].humanized, results[1].humanized, ...

AI Detection Only (No Humanization)

$curl "https://george-the-developer--ai-text-humanizer-api.apify.actor/detect?text=Your+text+here"

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5 Writing Styles

The same AI input transformed into five distinct voices:

AI Input: "Furthermore, it is important to note that implementing robust cybersecurity measures is essential for organizations seeking to obtain a competitive advantage in the digital landscape."

Style	Output	Best For
Casual	"Look, good cybersecurity really matters if you want an edge in the digital world."	Blog posts, social media, emails
Professional	"Strong cybersecurity measures are essential for organizations looking to maintain a competitive edge in the digital space."	Business writing, reports, LinkedIn
Academic	"Implementing substantive cybersecurity measures remains essential for organizations seeking a competitive advantage in the digital domain."	Papers, research, dissertations
Creative	"Solid cybersecurity isn't just nice to have -- it's genuinely the thing that gives companies their edge in today's digital world."	Marketing copy, articles, storytelling
Technical	"Implementing performant cybersecurity measures is essential for organizations requiring a competitive advantage in digital infrastructure."	Documentation, whitepapers, specs

---

3 Aggressiveness Levels

Level	What It Does	Best For
Light	Replaces AI phrases + adds contractions + applies style. Safe, meaning-preserving.	Professional docs where subtle changes are enough
Medium	Everything in Light + sentence restructuring + starter diversification + comma reduction + subtle imperfections.	General purpose. Start here.
Heavy	Everything in Medium + aggressive imperfection injection + maximum burstiness. Text sounds distinctly human.	When you need to pass strict AI detectors

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Why This Humanizer?

Feature	This API	Quillbot	Undetectable.ai	WriteHuman
Price	$0.003/text	$9.95/mo	$9.99/mo	$12/mo
API Access	Yes (instant)	No API	Limited API	No API
Speed	<500ms	2-5s	3-8s	2-6s
Before/After Scores	Included free	No	Separate tool	No
Bulk Processing	20 texts/request	1 at a time	1 at a time	1 at a time
Style Options	5 styles	1 mode	2 modes	1 mode
Aggressiveness Control	3 levels	None	None	None
External API Dependency	None (pure algo)	GPT-based	GPT-based	GPT-based
Pay-per-use	Yes	Monthly only	Monthly only	Monthly only
Works Programmatically	REST API	Browser only	Browser only	Browser only

The math: Humanize 1,000 texts/month and you pay $3.00. Their monthly plan costs 3-4x that for the same volume -- and they don't even have an API.

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AI Detection Methodology

The built-in detector analyzes text across 9 weighted factors:

Factor	Weight	What It Measures
AI Phrase Density	22%	Frequency of 40+ known AI transition phrases
Sentence Uniformity	15%	How consistent sentence lengths are (AI = very uniform)
Burstiness	12%	Variation in sentence complexity (humans are bursty)
Vocabulary Diversity	10%	Type-Token Ratio -- unique words vs total words
Starter Diversity	10%	Whether sentences begin the same way repeatedly
Paragraph Uniformity	8%	How equal paragraph lengths are
Readability Band	8%	Whether text sits in the AI-typical grade 10-14 band
Structure Repetition	8%	Repetitive "X is Y" and "X can Y" patterns
Comma Pattern	7%	AI uses 1.5-3 commas per sentence consistently

Score Interpretation

Score Range	Verdict	Meaning
80-100	ai_generated	Almost certainly written by AI
60-79	likely_ai	Strong AI signals detected
40-59	mixed	Could be either -- some AI patterns present
20-39	likely_human	Mostly human characteristics
0-19	human_written	No significant AI patterns found

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API Reference

GET /humanize

Parameter	Type	Default	Description
text	string	required	The text to humanize (max 50,000 chars)
style	string	casual	casual | professional | academic | creative | technical
level	string	medium	light | medium | heavy

POST /humanize

{
  "text": "Your AI-generated text here...",
  "style": "casual",
  "aggressiveness": "medium",
  "preserveMeaning": true
}

POST /humanize/bulk

{
  "texts": [
    { "text": "First text...", "style": "casual" },
    { "text": "Second text...", "style": "professional" }
  ],
  "aggressiveness": "medium"
}

GET /detect

Parameter	Type	Description
text	string	The text to analyze for AI patterns

Response Format (Humanize)

{
  "original": "Furthermore, it is important to note that...",
  "humanized": "Look, it's important to know that...",
  "originalLength": 142,
  "humanizedLength": 98,
  "detection": {
    "before": { "score": 87, "verdict": "ai_generated" },
    "after": { "score": 31, "verdict": "likely_human" },
    "improvement": 56
  },
  "settings": {
    "style": "casual",
    "aggressiveness": "medium",
    "preserveMeaning": true
  },
  "aiPhrases": {
    "removed": 5,
    "remaining": 0
  }
}

Response Format (Detect)

{
  "score": 87,
  "verdict": "ai_generated",
  "factors": [
    { "name": "ai_phrases", "score": 95, "weight": 22, "detail": "6 phrases found", "phrases": ["furthermore", "in conclusion"] },
    { "name": "sentence_uniformity", "score": 85, "weight": 15, "detail": "CV=0.18" },
    { "name": "burstiness", "score": 90, "weight": 12, "detail": null }
  ]
}

---

AI Agent Integration

Building an AI agent or workflow that generates content? Pipe it through this API as the last step.

LangChain / AI Pipeline

// After your LLM generates text, humanize it before publishing
async function humanizeOutput(aiText, style = 'professional') {
  const res = await fetch(
    'https://george-the-developer--ai-text-humanizer-api.apify.actor/humanize',
    {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': 'Bearer YOUR_APIFY_TOKEN'
      },
      body: JSON.stringify({ text: aiText, style, aggressiveness: 'medium' })
    }
  );
  const data = await res.json();
  return data.humanized;
}

// In your pipeline:
const draft = await llm.generate('Write a blog post about...');
const published = await humanizeOutput(draft, 'casual');
// published reads like a human wrote it

Python Agent

import requests

def humanize(text, style='casual', level='medium'):
    """Drop-in function for any Python AI pipeline."""
    r = requests.post(
        'https://george-the-developer--ai-text-humanizer-api.apify.actor/humanize',
        headers={'Authorization': 'Bearer YOUR_APIFY_TOKEN'},
        json={'text': text, 'style': style, 'aggressiveness': level}
    )
    return r.json()

# Use it anywhere
result = humanize(chatgpt_output, style='professional', level='heavy')
print(result['humanized'])
print(f"AI score dropped from {result['detection']['before']['score']} to {result['detection']['after']['score']}")

---

Pricing

$0.003 per text humanized. Detection-only requests (/detect) are free.

Volume	Cost	Per-Text
100 texts	$0.30	$0.003
1,000 texts	$3.00	$0.003
10,000 texts	$30.00	$0.003
100,000 texts	$300.00	$0.003

No monthly fees. No minimums. No commitments. You pay only for what you humanize.

Compare: Undetectable.ai charges $9.99/month for ~5,000 words. That's roughly 50 paragraphs. With this API, 50 texts costs $0.15.

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Use Cases

Who	Why	Style
Content Creators	Make AI-drafted blog posts sound authentic	casual or creative
SEO Professionals	Google's helpful content update penalizes AI-sounding text	professional
Students	Polish AI-assisted research while keeping academic tone	academic
Email Marketers	Warm up cold emails so they don't read like a template	casual
Social Media Managers	AI-generated posts that sound like real people	casual + heavy
Technical Writers	Clean up AI-drafted docs without losing precision	technical
Agencies	Humanize client deliverables at scale with bulk endpoint	Any + bulk
AI Agent Builders	Last-mile processing before publishing LLM output	Any

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Frequently Asked Questions

Does it beat GPTZero, Originality.ai, and other detectors?

The humanizer targets the same patterns these detectors look for: sentence uniformity, AI transition phrases, burstiness, vocabulary diversity, and structural repetition. In testing, AI scores typically drop 40-60 points. Results vary by input length and original AI density. The built-in before/after scoring lets you verify every single result.

How does it work without using GPT or any LLM?

Pure algorithmic transforms. The engine doesn't "rewrite" your text with another AI -- it applies 12 deterministic passes that systematically remove AI patterns. This means: no hallucinations, no meaning drift, no external API costs, and sub-500ms response times. Your text goes in, the same text comes out with AI fingerprints removed.

Is it ethical to use?

This tool helps you sound like yourself. If you use AI to draft content (like most professionals now do), humanizing the output is no different than editing a first draft. The tool preserves your meaning while removing robotic patterns. We include detection scores for full transparency -- you always know exactly what changed.

What's the maximum text length?

50,000 characters per text. For bulk requests, up to 20 texts per call. No rate limits on the API itself.

Does it work for non-English text?

The current version is optimized for English. The phrase replacement dictionaries, contraction rules, and readability formulas are English-specific. Other languages may see partial improvement from structural transforms.

Why is detection included for free?

Detection lets you verify the humanization worked. It also makes the API useful for the opposite use case -- checking if content you received was AI-generated. Both directions, one API.

Can I use this with RapidAPI?

Yes. This API is available on both Apify and RapidAPI. Same endpoints, same pricing.

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Endpoints Summary

Method	Path	Description	Cost
GET	/	Health check + documentation	Free
GET	/humanize?text=...	Quick humanization	$0.003
POST	/humanize	Humanize with full options	$0.003
POST	/humanize/bulk	Bulk humanize up to 20 texts	$0.003/text
GET	/detect?text=...	AI detection scoring only	Free
POST	/detect	AI detection (POST body)	Free

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Run on Apify

You can also run this actor directly on Apify with input:

{
  "text": "Your AI-generated text to humanize...",
  "style": "casual",
  "aggressiveness": "medium"
}

The actor works in two modes:

1. Standby API (default) -- instant HTTP responses at the endpoints above
2. Standard run -- pass input directly, results saved to dataset

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Built by george.the.developer on Apify.