Most AI detectors charge per scan or require expensive subscriptions. GPTZero offers limited free checks, Originality.ai costs $14.95/month, and Turnitin requires an institutional license. Our AI detector is completely free — no sign-up, no credit card, no word count limits, unlimited checks. Upload any PDF or DOCX file or paste your text directly to get a detailed analysis across 16 AI writing indicators. Whether you are a student checking your thesis, a teacher reviewing assignments, or a researcher verifying a paper, our tool delivers comprehensive results without any barriers.
Free AI Detector - No Sign Up Required
Check any document for AI-generated content. Completely free, no registration, no credit card, no word limits. Instant results.
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Why Choose Our Free AI Detector?
Truly Free
No hidden costs, no premium tiers, no 'free trial' limitations. Our AI detector is free for everyone, always.
No Registration
No account creation, no email verification, no personal data collection. Just upload and check.
Unlimited Use
Check as many documents as you need. No daily limits, no monthly quotas, no per-scan charges.
Full Analysis
Get the same comprehensive 16-indicator analysis that paid tools provide. No features are locked behind a paywall.
How Our Free AI Detector Works
- Upload your document in PDF or DOCX format, or paste your text directly into the tool.
- Our detector analyzes 16 statistical indicators across five families: vocabulary diversity (MTLD, hapax, Yule's K), sentence rhythm (length uniformity, length variation, burstiness, opening diversity), phrase fingerprints (60+ AI-favored phrases and transition word frequency), document structure (paragraph uniformity, passive voice, sentence-to-sentence flow), and statistical fingerprints (Zipf exponent, character entropy, punctuation diversity, word length variation).
- Each factor is scored from 0 to 100 and weighted to produce an overall AI probability score.
- Review the detailed per-factor breakdown to understand exactly which patterns were detected.
- Revise flagged sections and re-check as many times as you need — unlimited, free.
Free vs. Paid AI Detectors
- GPTZero: Free tier limited to 5,000 characters. Premium starts at $10/month.
- Originality.ai: $14.95/month for 200,000 words. No free tier.
- Turnitin: Requires institutional license ($3+ per student per year).
- Copyleaks: Free tier limited. Premium from $9.99/month.
- ThesisDraft AI Detector: 100% free. No limits. No sign-up. Full analysis.
Frequently Asked Questions
Yes. 100% free with no limitations. No sign-up, no credit card, no word limits, no daily caps. We are not a 'freemium' tool — there is no premium tier.
We offer this as a free tool to help students and educators. Our main business is professional thesis drafting services. The free AI detector helps build trust and awareness of our brand.
No. You can upload unlimited documents of any length. There are no daily limits, no monthly caps, and no features locked behind a paywall.
Our tool uses similar statistical analysis methods as paid detectors. For individual document checks, our results are comparable. Paid tools may offer additional features like API access, batch processing, or plagiarism checking.
No. Your text is analyzed in real-time and not stored on our servers. We do not keep copies of your documents.
Yes. Essays, theses, dissertations, research papers, homework, articles — any text document in PDF or DOCX format, or pasted directly.
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