Free AI Detector
Commercial use OK
380+ models
No watermark
No sign-up needed
Model:
+ GPT-5, Claude, Gemini
Honest note on AI detectors:
AI detectors are not reliable. Academic research (Stanford HAI, Vanderbilt, University of Maryland) shows false-positive rates of 5–15% on genuine student writing and false-negative rates that climb above 30% on modern models (GPT-4+, Claude, Gemini). Our score reflects pattern-matching heuristics (perplexity, burstiness, AI-tell phrasing), not ground truth. Do not use this to accuse anyone of academic misconduct. Use it to audit your own drafts or as one signal among many.
Verdict
Pattern-match score, not ground truth.
100% human
100% AI
AI-tell signals detected
Per-sentence confidence
Advanced options
Result
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Detect AI-generated text for free. Check if content was written by AI or human.
How to Use Free AI Detector
1
Enter your input
Type text, upload a file, or describe what you want. No account needed.
2
Click generate
Our AI processes your request in seconds using the best open-source models.
3
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Download, copy, or share your result. Free for personal and commercial use.
Use this tool via API
Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.
curl -X POST https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer sk-free-..." \
-H "Content-Type: application/json" \
-d '{"model": "qwen7b", "messages": [{"role": "user", "content": "Summarize this: ..."}]}'Related Free AI Tools
Free AI Detector — FAQ
Yes! Free AI Detector on Free.ai is completely free. No credit card, no hidden fees, no trial period.
No! You can use Free AI Detector immediately without any registration. Creating a free account gives you 3x more daily usage.
Free AI Detector is powered by state-of-the-art open-source AI models running on our GPU servers. Enter your input and get results in seconds.
Absolutely. Your data is processed securely and never stored permanently. We do not sell or share any user data.
Free users get generous daily limits that reset every 24 hours. Sign up for 3x more, or upgrade for unlimited access starting at $5/month.
Yes! Free AI Detector works on all devices. Our responsive design adapts perfectly to phones, tablets, and desktops.
Yes! All output from Free AI Detector is yours to use for personal and commercial purposes. Our AI models are commercially licensed.
Free AI Detector delivers comparable quality to paid services using the latest open-source AI. We believe AI should be free for everyone.
Free AI Detector uses best-in-class open-source models like Qwen, FLUX, Kokoro, Whisper, and more. We update to the latest models regularly.
We are working on a developer API. Contact us for early access to the Free AI Detector API.
Yes! You can download, copy, or share results. Signed-in users can also access their full generation history.
Free.ai runs AI locally on our own servers using open-source models. This means true privacy, no rate limiting tricks, and no bait-and-switch pricing.
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