Plagiarism checker
Compare a text with web pages and public documents, and get a sourced similarity report.
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Text tool
AI content detector
See which parts of a text read as machine-written
Paste a text and get a probability that it was generated by an AI model, with a sentence-level view showing where the signal is strongest and why.
What you get
- Overall probability with a clear scale
- Sentence-level highlights, not just one number
- Readability score and sentence counts alongside the probability
- PDF report for teachers, editors and clients
How it works
Step 1
Paste the text to analyse
Step 2
Wait for the analysis to finish
Step 3
Read the probability and the highlighted sentences
When to use it
A submitted assignment
Get a sentence-level reading to support a conversation, not a verdict.
A freelance delivery
Check whether a commissioned text was written as agreed.
Your own draft
See which passages read as mechanical before you rewrite them.
Good to know
- Input
- Pasted text — length shown on the tool page
- Result
- Probability, sentence highlights, PDF report
- Processing time
- Progress shown on screen during processing
- Limits
- A probability, not proof — see the guide
Questions about this tool
Is the result proof that a text is AI-written?
No. The detector returns a probability based on statistical patterns. Short, formulaic or heavily edited texts can be misclassified either way; use the result as one signal among others.
Which models can it detect?
Detection relies on statistical patterns shared by the widely used text models. No detector covers every model perfectly.
How long should the text be?
The longer the better: a few hundred words give a far more reliable reading than a single paragraph.
Related guides
How AI text detection works — and its limits
Perplexity, burstiness, classifiers: what detectors measure, what the score means and when to trust it.
How to make AI-written text sound natural
The habits that make generated text feel mechanical, and how to rewrite them — by hand or with the humanizer.
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See which parts of a text read as machine-written