Paste your text and see within seconds which sentences are probably AI-generated. Sentence by sentence, in twelve languages and with no sign-up.
AI Detector: check your text for AI for free
Very likely AI
Likely AI
Possibly AI (not counted in the percentage)
A highlight is a hint, not proof.
Upload your paper as Word or PDF. The overview is free.
- 🔒 Your document remains confidential
- 🇪🇺 Servers in the European Union
- ✅ 100% GDPR compliant
- 🎓 Built for essays and academic theses
- 💳 Start with a free overview
Used by more than 70,000 students 🎉
AI detection with Mimir Mentor: how it works
Want to see what you get?
Preview the report layout and types of findings. This demonstration is not your result; report access depends on your plan or scan.
Student experiences with Mimir Mentor
4.7 out of 5 stars (49)
Ready for a clearer next draft?
Free AI detector
Paste your text. Get clarity at once.
Paste up to 1,200 words and see within seconds how much of it is probably AI-generated. Free and without signing up.
Every sentence rated on its own
The AI detector highlights every conspicuous sentence in one of three levels. You see exactly which passages to revise before you hand in.
Plagiarism check and proofreading included
In the document scan, Mimir also checks your whole paper for plagiarism, missing sources and errors. The overview is free.
Turn flagged passages into a clear review plan.
Premium: inspect the passages behind the overview
AI report for the whole document
Upload your paper as a Word or PDF file. The premium scan rates your entire document sentence by sentence and shows the AI risk for every passage.
Different reports, different questions
Source comparison asks where your wording may be too close. AI detection estimates patterns associated with generated text. Correction suggests language improvements. None is an automatic verdict on your work.
Move from a finding to a better draft
Work through the relevant passages rather than chasing a particular score. Make your own meaning clear, preserve necessary quotations and verify every reference you add.
AI detector for bachelor’s theses, master’s theses, term papers and more
Your first steps in academic writing
Check your school papers and projects before handing them in and see which passages are probably AI-generated. That is how you learn to use AI as a help and still write in your own words.
Support for essays and theses
Check your paper for AI text, plagiarism and citation errors before your university does. You see clearly which passages stand out and hand in with a good feeling.
Review work and support students
See at a glance which passages of a paper are probably AI-generated: sentence by sentence instead of just a percentage. A good basis for the conversation with students.
Detecting AI text: what the AI checker looks at
Language models such as ChatGPT, Claude and Gemini write fluently, but along recurring patterns: even sentences, predictable word choice, typical transitions. Our AI detector is a model of our own that rates exactly these patterns, sentence by sentence.
We trained and tested it with texts from current models by OpenAI, Anthropic and Google and from open models, as well as with academic texts written by humans. When a new model comes out, we measure again.
The AI checker works in twelve languages: English, German, French, Spanish, Italian, Dutch, Polish, Portuguese, Turkish, Danish, Swedish and Finnish.
For essays, dissertations and theses
Many universities now also check submitted work for AI text. With the AI detector you can see before you submit which passages might raise questions, so you can rewrite them or disclose your AI use properly.
Frequently asked questions about the AI detector
Yes. You can paste up to 1,200 words per check and check several times a day, with no account and at no cost. Only the full report for a whole paper is paid.
The detector is set strictly so that your own texts are not flagged by mistake: in our test in November 2026, none of 481 human-written texts was flagged. Texts written entirely by AI are found very often, mixed texts considerably less often. No detector is free of errors.
Yes. The model was trained and tested with texts from these providers’ current language models. When new models come out, we measure again and adjust the detector.
It happens rarely, but it can, for example with very formulaic sentences or if you polished the wording with an AI tool. A highlight is therefore always only a hint. Rephrase the passage in your own words and check again.
No. The pasted text is processed only for the check and is not kept. The check runs with our own model on our servers in Germany.
Many universities use software for this, for example Turnitin, and lecturers also look at style and sources. Each institution decides whether and how it checks. Read more in the article AI detection at university.
Twelve languages: English, German, French, Spanish, Italian, Dutch, Polish, Portuguese, Turkish, Danish, Swedish and Finnish.
Rewrite the highlighted passages in your own words or disclose your AI use the way your university requires. The article Disclosing AI use explains how.
Who is behind the AI detector
Mimir Mentor comes from Mainz, Germany, and is used by more than 70,000 students. We developed and trained the AI detector ourselves. About us · Reviews
For lecturers, editing services and companies: if you want to check many texts or build the detector into your own software, write to us at info@mimir-mentor.com.