Free AI Detector for Teachers & Professors

Check student submissions for AI-generated content. Free tool with detailed analysis across 16 AI writing indicators. Free for the first 1,500 words - no sign-up, no credit card.

Free to 1,500 WordsNo Sign-Up RequiredNo Credit CardUnlimited Re-ChecksError Rate PublishedInstant Results

Looking for a free AI detector for your student submissions? Most AI detection tools like GPTZero, Originality.ai and Turnitin charge per scan or require a monthly subscription. This one reads the first 1,500 words of any document free, with no sign-up and no credit card, and checks a full document of up to 30,000 words for €4.99 once rather than every month. As an educator, verifying the authenticity of student work has become a core part of your role. Our free AI detector gives you a quick, detailed analysis of any student submission - essays, papers, theses, or assignments. The tool analyzes 16 statistical dimensions of writing, providing a probability score and per-factor breakdown. This helps you make informed decisions about student work rather than relying on suspicion alone. Upload any PDF or DOCX file, or paste text directly. No institutional license required, no sign-up needed, completely free for educators.

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Why Teachers Need an AI Detector

Quick Screening

Quickly scan student submissions before grading. The tool provides results in seconds for any document length.

Evidence-Based Decisions

Get specific data on which AI patterns are present, rather than relying on gut feeling. The detailed breakdown supports fair academic integrity processes.

No Institutional License

Unlike Turnitin or other institutional tools, our detector is free for individual educators. No IT department setup required.

Student Conversations

Use the detailed analysis to have productive conversations with students about writing authenticity.

How to Use Our Teacher AI Detector

  • Upload the student's submission in PDF or DOCX format, or paste the text directly.
  • Our tool analyzes 16 indicators across five families: vocabulary diversity (MTLD, hapax, Yule's K), sentence rhythm (length uniformity, length variation, burstiness, opening diversity), phrase fingerprints (AI phrases and transition word frequency), document structure (paragraph uniformity, passive voice, sentence-to-sentence flow), and statistical fingerprints (Zipf, character entropy, punctuation diversity, word length variation).
  • Review the overall AI probability score and the per-factor breakdown.
  • Use the detailed results to inform your grading decisions or student discussions.
  • Check as many submissions as you like - the free tier reads the first 1,500 words of each.

Tips for Educators

  1. Use AI detection as one data point, not the sole basis for academic integrity decisions.
  2. Be aware that false positives occur, especially with non-native English speakers and formal writing styles.
  3. Compare flagged work with a student's previous submissions to assess consistency.
  4. Establish clear AI use policies in your syllabus and communicate them early in the term.
  5. Consider using in-class writing samples as a baseline for each student's writing style.
  6. When confronting students, focus on specific patterns identified by the tool rather than general accusations.

Frequently Asked Questions

The first 1,500 words are free, with no sign-up, no credit card and no cap on how often you run it. Unlike GPTZero, Originality.ai or Turnitin, checking a full student submissions is a single €4.99 payment rather than a subscription - and it includes 14 days of unlimited re-checks.
The free tier covers your first 1,500 words, which is enough to check an abstract or a chapter and not enough to check a thesis - that is the paid check, at €4.99 once. We keep the free tier genuinely useful because it is how people find us, and because a student who cannot pay should still be able to see what a detector sees.
Our tool uses similar statistical analysis methods as paid tools. While paid services may offer additional features like plagiarism checking or API access, our core AI detection analysis is comprehensive and effective for individual document checks.
Our tool provides statistical analysis, not definitive proof. Use it as one factor alongside your professional judgment, student history, and institutional processes.
There is no cap on how many documents you can check. Each one is read to 1,500 words on the free tier; a full-length document is €4.99 and that pass covers 14 days of unlimited checks.
It complements institutional tools. Our detector focuses specifically on AI writing patterns, while Turnitin also checks for plagiarism. Many educators use both.

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Point your students at the free check. It reports the false-positive rate beside every verdict, so a flagged student can see how much weight that verdict deserves.

See what the full check costs