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AI Content Detector Free

Detect if text was written by AI or human. Works entirely in your browser. Your files never leave your device.

Open AI Detector Free
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🔍 Analyzes writing patterns to estimate if text was AI-generated or written by a human.

⚙️Analyzing...

What is AI Detector?

AI Detector is a free AI-powered tool that uses the Claude AI model to generate high-quality results instantly. It handles the complex processing so you get professional output without needing any technical skills. Requires an Anthropic API key for AI-powered features.

This tool lets you detect if text was written by ai or human without installing any software or creating an account. Everything runs directly in your browser for maximum privacy. Your files and data never leave your device.

Use it for quick tasks at any time from any device — desktop, tablet or mobile. No subscription, no ads, no limits.

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Instant results
No server processing or wait
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100% private
Files stay on your device
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Always free
No subscription or fees
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Mobile ready
Works on any device

How to use AI Detector

  1. Paste the text you want to analyze for AI-generated content
  2. Click Analyze — the detector evaluates writing patterns and structure
  3. Review the probability score and highlighted suspicious passages
  4. Use the result as one signal, not a definitive verdict

Why use OnlineToolsPlus?

AI tools on OnlineToolsPlus use the Claude API — one of the most capable AI models available. You bring your own API key, which means your text goes directly to Anthropic's servers (not through OnlineToolsPlus), and you pay only for what you use. This gives you full control over cost and privacy while accessing professional-grade AI writing assistance.

Frequently asked questions

How does AI detection work?
The detector analyzes patterns in the text including sentence structure uniformity, word choice distributions, predictability, and other statistical markers that tend to differ between human and AI-generated writing.
Is the result definitive?
No AI detection tool is 100% accurate. Results are probabilistic estimates. False positives (human text flagged as AI) and false negatives (AI text not detected) both occur. Use as one signal, not a definitive verdict.
Can humanized AI text fool the detector?
Humanized text is harder to detect. Well-humanized AI text may score as likely human. This reflects the inherent limitation of detection as a technology.
Does it detect text from any AI model?
The tool looks for patterns common across AI models. It is not model-specific. Text from GPT, Claude, Gemini, and others may all be assessed.
Does this need an API key?
Yes. This tool uses the Claude API to perform the analysis.
What score means AI-written vs human-written?
Higher percentage indicates more AI-like patterns. A 70%+ score suggests likely AI involvement. Below 30% suggests human writing. The middle range is genuinely uncertain.

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Last updated: April 11, 2026

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