---
title: "How does an AI detector work?"
description: "It reads your text and measures patterns, then compares them to what machine writing usually looks like. The main signals are predictability (called perplexity) and sentence-length variance..."
url: https://removeaitells.com/faq-items/how-does-an-ai-detector-work/
date: 2026-09-20
modified: 2026-09-20
author: "Remove AI Tells"
type: faq
lang: en
---

# How does an AI detector work?

It reads your text and measures patterns, then compares them to what machine writing usually looks like. The main signals are predictability (called perplexity) and sentence-length variance (burstiness), plus repeated phrases and structure. It never sees who typed the words. It only judges the text itself, then reports a score or a label based on how machine-like those patterns seem.