POST

Humanization API

Rewrite AI-generated text to read naturally and bypass all major AI detectors including Turnitin, GPTZero, Copyleaks, Originality.ai, and Winston AI.

Overview

The Phrasly Humanization API transforms AI-generated content into natural, human-sounding text that is indistinguishable from content written by a person. It is designed for developers and businesses who need to process AI-written text at scale while preserving the original meaning, tone, and context.

Unlike generic paraphrasing tools, the Humanization API uses purpose-built models trained specifically for AI text rewriting. The output is optimized to bypass all major AI content detectors -including Turnitin, GPTZero, Copyleaks, Originality.ai, and Winston AI -making it the most effective and affordable humanization solution for enterprise use.

The API accepts text between 20 and 5,000 words per request and supports three strength modes (easy, medium, aggressive) so you can control the degree of rewriting. Streaming is supported for real-time delivery of results.

POST https://business.phrasly.ai/api/v1/humanize

Request Body

text

stringrequired

The text to humanize. Must be between 20 and 5,000 words.

mode

string

Strength: easy, medium (default), aggressive

stream

boolean

Stream tokens as they generate. Default: false

Response

Returns plain text (Content-Type: text/plain) with the humanized output.

Code Examples

bash

curl -X POST https://business.phrasly.ai/api/v1/humanize \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Your AI-generated text here...",
    "mode": "medium"
  }'

Modes Explained

Mode	Description
easy	Light rewrite. Preserves most of the original structure while making minimal changes to bypass detection.
medium	Balanced rewrite (default). Good mix of naturalness and detection evasion.
aggressive	Maximum rewrite. Heavily restructures the text for the strongest bypass results.

Supported AI Detectors

The Humanization API is continuously tested and optimized against every major AI content detection platform. Our purpose-built models are regularly updated to maintain consistent bypass rates as detectors evolve. Supported detectors include:

Turnitin

The most widely used academic integrity platform, trusted by over 16,000 institutions worldwide.

GPTZero

A popular AI detection tool used by educators, publishers, and content platforms to identify AI-authored text.

Copyleaks

Enterprise-grade AI content detection with multi-language support used by businesses and universities.

Originality.ai

An AI detection and plagiarism checking tool designed for content marketers, SEO agencies, and publishers.

Winston AI

An AI content detection solution with document and image scanning capabilities for teams and organizations.

ZeroGPT

A free AI text detector that analyzes writing patterns to classify content as AI-generated or human-written.

Common Use Cases

The Humanization API is used across a wide range of industries and applications where AI-generated content needs to sound natural and authentic:

Content marketing platforms that generate blog posts, product descriptions, and ad copy with AI and need output that reads naturally.
SEO agencies producing high-volume content that must pass AI detection checks before publication.
EdTech platforms and writing assistants that help students improve AI-drafted essays into polished, human-quality work.
SaaS products offering AI writing features where the final output needs to be indistinguishable from human writing.
Enterprise teams processing internal communications, reports, and documentation generated by large language models.