Local AI text detector

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Paste a text or upload a document — a model right in your browser will estimate how much it looks like AI writing and highlight such sentences. Texts and files are never sent anywhere.

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How the local AI text detector works

AI writes predictably: almost every next word it picks is one of the most likely options. People write less evenly, with unexpected words and sentences of different length. The detector runs your text through a small language model (Qwen2.5 0.5B) right in your browser and checks, for every word, how strongly the model expected it.

What the numbers mean

Top-10 words — the share of words the model would have put among its ten best guesses. AI text usually scores 70–85%, human text 50–65%.
Perplexity — how “surprised” the model is by the text overall. The lower it is, the more predictable the text.
Burstiness — how much the predictability changes from sentence to sentence. It is higher in human writing.

How to use it

Open the page on a computer in an up-to-date Chrome, Edge or Firefox.
Paste a text or upload a file (PDF, Word .docx, TXT), ideally 150 words or more, and click “Check text”.
On the first run the model (~510 MB) downloads once and stays in your browser.
Look at the score and the highlighting: red sentences look like AI, yellow ones are mixed, green ones look human. The “By word” view shows which words the model expected most.

Texts and files never go to a server: reading the document, the model and the analysis all run on your device.