Artificial intelligence is no longer a science fiction concept, it is in the backpack of our students. With tools like ChatGPT, Gemini or Copilot just a click away, the production of texts, analyses and even images has become very tempting.
Good news: detectors exist, useful for a first clue. Bad news: none is infallible.
It is therefore a question of avoiding final verdicts, but of equipping yourself to sharpen your gaze. AI detectors are not foolproof, but they provide useful guidance to open up dialogue and encourage ethical use technology
Here are five of the most serious text- and/or image-oriented services on the market today.
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Top 5 AI Content Detectors
The number of existing tools that promise to unmask an AI-generated text or image is quite colossal. I have selected five of them, which are known for their seriousness and efficiency. All of them will give you a score indicating as a percentage the amount of suspicious text. The same text will not give the same score in two different tools but all of you will highlight sentences considered wrongly or rightly doubtful.
Winston AI. A text and image AI detector, designed for education
Winston AI offers both a text detector (with an education mode) and a image detector / deepfakes (Midjourney, DALL·E, Stable Diffusion, etc.).
The editor highlights high accuracy for the texts, and a page dedicated to teaching uses. The service operates on a credit basis; image analysis consumes separate credits.
Winston acts as both an AI detector and an excellent plagiarism checker. It allows to scan Word files, PDF and even images (via OCR), very convenient for rendered work. The interface is in French. 14 days free trial.
AIDetector. Text + image + humanizer
AIDetector announcement detection of text and images, and adds a ‘humanize’ button that rewrites the suspicious passage to make it more ‘human’.
For a teacher, the main interest lies in the versatility (text + image) and the speed of the first sort.
Avoid, however, encouraging the use of the ‘humanizer’: the pedagogical objective is to learn cite and documenting the use of AI, not camouflage it.
Originality. Renowned for its rigour in detecting AI co-conductors
Originality is specialized in AI-Generated Text Detection, plagiarism check, full site reading. It can be useful for public reports (school sites, blogs, school magazines) where theoriginality Traceability is as important as AI.
Merlin. Free, without registration, perfect for a first filter
Merlin's Detector is free and usable without account. It is a little less reliable than the previous tools focused on professional use. Merlin targets texts from recent models (GPT-4o, Claude 3.5, Gemini).
Merlin allows you to copy paste your text before instantly producing an ‘AI-generated’ vs ‘Human-generated’ percentage and the marked passages.
The publisher itself points out that “no system is 100% accurate” (No system is accurate to 100 %) : a good pedagogical signal to pass on to students.
Quillbot. Another free detector for a first analysis of a text
QuillBot proposes a Detector Free AI (with length limits, up to 1200 words free of charge)) and a blog that explicitly recalls that detection is never 100 % reliable. Interesting small function: its reports sometimes indicate the share of “AI-refined” (human text retouched by AI), a common case among students.
While doing the tests on this list of AI detectors, I fell back on another detection tool that has good press. This is GPTZero. I dedicated to him a full-fledged article where I highlighted his qualities as an AI detector.
These tools are indicators, not judges
An important point must be made. None of these tools are perfect. It is essential to know their limits in order to use them wisely:
- False Positives: Sometimes a text 100 % human, especially if it is very factual or structured in a simple way, or is flagged as potentially generated by AI.
- False negatives: Conversely, a text generated by AI and then heavily reworked by a human can quite pass under the radar.
Consider the result of a detector as a thermometer: it tells you if there is a potential ‘fever’, but it does not provide the full diagnosis. It may come, but we are not there yet.
| Tool | Strengths (teachers) | Weaknesses / Limits | Tariff |
|---|---|---|---|
| Winston AI | • Detection text & images (deepfakes) • Easy-to-present "education" mode and visual reports • Adapted to IMS and visual files |
• Paid use after trial • Credit model (may limit frequent analyses) • Interface mostly in English |
Paying Credits / subscriptions (≈ from 15 € / month depending on package) |
| AIDetector (aidetector.com) |
• Rapid analysis of text + image • Ideal as a first sort in class • Accessible and often without an account for a test |
• Humanize function that may induce circumvention • Scores sometimes variable according to the samples |
Freemium Free basic features, possible paid options |
| Originality | • Combine AI detection and plagiarism • URL scan (practice for establishment blogs) • Designed for long work (TPE, reports) |
• Editorial team-oriented interface (less intuitive for one-time use) • Does not detect images |
Paying Pay-per-use pricing (e.g. word/credit rate) |
| Merlin AI Detector | • Free and without registration • Very easy to use: ideal for raising awareness • Compatible with recent models (GPT-4o, Claude, Gemini) |
• No detailed report • Text only • Sometimes binary results (limit of interpretation) |
Free |
| QuillBot AI Detector | • Indicates the possible portion of text " AI-refined (useful pedagogically) • Clear interface for pedagogical support • Familiar to QuillBot users |
• Free length limit (≈1200 words) • Text only • Some features reserved for subscribers |
Freemium Limited free detection, paid subscription for advanced features |
No miracle but precious assistants
AI content detectors are neither a miracle solution nor a gadget. But they have their place in the teacher’s digital toolbox. Used with a little discernment, they protect the value of personal work while creating opportunities for exchanges with young people on ethics and technology.
Have you ever tested these tools? Do you know any others? Share your experience in the comments!
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