AI Content Detector

This free multi-engine AI text checker allows you to paste up to 10,000 characters and analyze your text through five leading AI detectors simultaneously: QuillBot, ZeroGPT, Originality.ai, Copyleaks, and Winston AI. Each engine provides its own AI-probability score, which are then averaged to produce a consensus verdict: HUMAN (≤15%), MIXED (≤40%), or AI GENERATED (above 40%).

Key Features:

• Five detectors in parallel: Get scores from QuillBot, ZeroGPT, Originality.ai, Copyleaks, and Winston AI for a more reliable verdict.
• Sentence-by-sentence highlighting: Each sentence is underlined green (human), yellow (mixed), or red (AI), with hover-over tooltips showing exact AI scores.
• Consensus verdict: A clear HUMAN / MIXED / AI stamp backed by the average of all five engines.
• No sign-up required: Paste text and analyze immediately, with no daily quota limitations.
• 30+ languages supported: Analyze text in a wide range of languages.
• Detection of multiple AI models: Catches output from ChatGPT, Claude, Gemini, Llama, Mistral, and DeepSeek.
• Up to 10,000 characters: Analyze longer texts with an increased character limit.

The tool provides a detailed breakdown, highlighting specific sentences that appear machine-written, making it invaluable for teachers, editors, publishers, SEO agencies, recruiters, students, journalists, and researchers to verify content authenticity.