AI Text Detector (Free, In-Browser)
Paste any text and see how likely it was AI-generated, scored 0-100 from 12 transparent, explainable heuristics: sentence-length burstiness, lexical diversity (MATTR), AI vocabulary clustering (delve, tapestry, leverage), em-dash density, negative parallelisms, rule-of-three triplets, transition-phrase density, and more. Every heuristic's contribution is shown so the score is never a black box. 100% client-side — your text never leaves your browser. This is a transparent smell-test, not proof: heuristic detection produces false positives on formal, academic, and non-native-English writing, so never use it for accusations or grading.
Read this before you trust the number
- This is a heuristic estimate, not proof. It cannot prove who or what wrote anything.
- False positives are common on formal, technical, or non-native (ESL) writing. Never use this to accuse or grade anyone.
- False negatives are easy — lightly edited or "humanized" AI text sails right past it.
- The vocabulary tells age fast as models change, so old signals lose accuracy over time.
- Short text is unreliable. Under ~120 words the confidence is low and the score wobbles.
- Genre matters — lists, legal text, and step-by-step instructions naturally look more "AI-like."
- 100% client-side and private. Nothing you paste is sent to a server.
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About AI Text Detector (Free, In-Browser)
Free AI content detector. Paste any text and get an AI-likelihood score from 12 transparent heuristics — burstiness, AI vocabulary tells, em-dash density, and more. 100% in your browser, nothing uploaded. This tool runs entirely in your browser — no data is sent to any server. Your content stays private and secure. MarkdownMe provides free, fast, and reliable Markdown tools for developers, writers, and anyone who works with Markdown.