Free AI Content Detector

How Does AI Content Detection Work?

AI content detectors work by analyzing patterns in text that distinguish human writing from machine-generated output. This tool uses a RoBERTa-based classifier model that was fine-tuned by OpenAI specifically for detecting AI-generated text. It examines statistical properties like token probability distributions, sentence structure uniformity, and vocabulary predictability to produce a confidence score.

Unlike cloud-based detectors like GPTZero, Turnitin AI Detection, or Originality.ai that require you to upload your text to their servers, this tool runs the entire model locally in your browser via Transformers.js. Your text never leaves your device — making it safe to check sensitive academic papers, confidential documents, or private content without privacy concerns.

The model achieves approximately 95% accuracy on GPT-2 generated text. Accuracy may vary with newer AI models like GPT-4, Claude, or Gemini, as detection becomes harder as language models improve. For best results, provide at least 50 words — longer samples produce significantly more reliable predictions. No AI detector is perfect, and results should be considered one signal among many.