---
title: Free AI Content Detector — Humanizer & Grammar Checker | AMZ Global Experts
url: https://www.amzglobalexperts.com/tools/ai-content-detector/
description: Detect AI-generated text instantly with sentence-level breakdown. Humanize AI content with one click, fix grammar errors via LanguageTool, and check content originality — free, no login required.
---Free Tool · No Login

# AI Content Detector

Instantly detect AI-generated text, fix grammar, check plagiarism, and transform content into authentic human writing — all in one place.

0 words 0 chars Analyze Content

## How the detection works

01

### Phrase Pattern Analysis

Scans for 40+ AI-favored transition phrases, filler language, and structural patterns that large language models default to.

02

### Burstiness & Variance

Humans write with natural rhythm variation. AI produces unnaturally uniform sentence lengths. We measure this coefficient of variation.

03

### Human Signal Detection

Identifies contractions, personal pronouns, informal language, and stylistic choices that signal authentic human authorship.

## Frequently asked questions

How accurate is the AI detection?

Our heuristic engine is highly effective at detecting common AI writing patterns from GPT-4, Claude, and Gemini. It achieves ~85% accuracy on clearly AI-generated content. Heavily edited AI content or content with strong personal voice may score lower. For critical use cases, combine with manual review.

Does this work for all AI models?

Yes. The detection targets linguistic patterns common to all large language models: uniform sentence rhythm, over-reliance on transition phrases, passive voice density, and vocabulary choices. These patterns appear across GPT-3.5, GPT-4, Claude, Gemini, Llama, and others.

What does the Humanize feature do exactly?

Humanize rewrites your content using Claude AI, replacing AI-typical phrases with more natural language, varying sentence length and structure, adding contractions, and removing filler words — while preserving all factual content.

Is my content stored or shared?

No. AI detection runs entirely in your browser — your text never leaves your device for analysis. Grammar checking uses the public LanguageTool API. Humanization sends text to our server to process with Claude AI. We do not log or store any submitted content.

What's the Originality / Plagiarism score?

The originality indicator analyzes internal phrase diversity and repetition within your document. For full plagiarism checking against published web content, use a dedicated service like Copyscape or Grammarly plagiarism checker.

Done Detecting?

## Need human-quality content at scale?

Our team writes SEO-optimized, deeply human content for Amazon brands and e-commerce businesses — product listings, blog articles, ad copy, and more.

[Get a Free Content Audit](/get-started/) [Explore All Tools](/tools/)

## FAQ

### How accurate is the AI content detector?

The detector achieves approximately 85% accuracy on clearly AI-generated content from models like GPT-4, Claude, and Gemini. It analyzes 40+ AI phrase patterns, sentence burstiness, passive voice density, and human signal markers. Heavily edited AI content may score lower.

### Does this AI detector work for ChatGPT, Claude, and Gemini?

Yes. The detection targets universal linguistic patterns that all large language models share: over-reliance on transition phrases, unnaturally uniform sentence lengths, passive voice overuse, and specific vocabulary preferences. These patterns appear consistently across GPT-3.5, GPT-4, Claude, Gemini, Llama, and other AI writing tools.

### How does the humanize feature work?

The humanize feature uses Claude AI to rewrite your content with natural sentence length variation, contractions, reduced filler language, and a more authentic voice — while preserving all factual information. Three styles are available: natural, casual, and professional.

### Is my content private and secure?

AI detection runs entirely in your browser — your text is never sent to a server for analysis. Grammar checking uses the public LanguageTool API. Humanization sends text to our server to process with Claude AI, and we do not log or store any submitted content.

### What is content burstiness?

Burstiness measures how much a writer's sentence lengths vary. Humans naturally alternate between short, punchy sentences and longer explanatory ones — creating high burstiness. AI models tend to produce sentences of similar length throughout, resulting in low burstiness, which is a strong signal of AI-generated content.