Free AI Detector — Detect AI-Generated Content
The most advanced free AI detector available. Analyze any text for AI-generated content with our multi-signal detection engine powered by GPT-4o.
Paste text & click Analyze, or try a sample
What Is an AI Detector?#
An AI detector is a tool designed to analyze text and determine whether it was written by a human or generated by an artificial intelligence model. As AI writing tools like ChatGPT, Claude, and Gemini have become widely adopted, AI detectors have become essential for educators, content managers, publishers, and anyone who needs to verify the authenticity of written content.
Our free AI detector at aichecker.tech uses GPT-4o-powered forensic analysis to examine multiple signals in text simultaneously, going far beyond simple perplexity scoring to deliver highly accurate results.
How Does Our AI Detector Work?#
The aichecker.tech AI detector examines five key signals in every piece of text you submit. Perplexity measures how predictable the word choices are — AI text tends to choose the most statistically probable next word, creating unnaturally smooth prose. Burstiness analyzes variation in sentence length, which is naturally high in human writing but often uniform in AI output. Sentence uniformity, formal transition frequency, and vocabulary repetition round out the analysis to provide a comprehensive detection result.
What AI Models Can This Detector Identify?#
Our AI detector can identify text generated by all major AI models including ChatGPT (GPT-3.5, GPT-4, GPT-4o), Anthropic Claude (Claude 3, Claude 3.5 Sonnet, Claude Opus), Google Gemini (Pro and Ultra), Meta Llama 3, Mistral, and Mixtral. The detector is continuously updated as new models are released.
AI Detector vs Plagiarism Checker#
An AI detector and a plagiarism checker serve different purposes. A plagiarism checker compares text against a database of existing content to find matches. An AI detector analyzes the statistical properties of the writing itself to determine if it was machine-generated. You may need both tools: our free plagiarism checker to ensure originality, and this AI detector to verify human authorship.
Why Choose aichecker.tech as Your AI Detector?#
Unlike many AI detectors that require paid subscriptions or account creation, aichecker.tech is completely free with no signup required. Our GPT-4o-powered detection engine provides accuracy comparable to premium tools like Originality.ai and Turnitin's AI detector. Every analysis is stateless — your text is never stored, logged, or used for training.