How does the AI detector work?

A classifier trained on large samples of human and AI-written text scores your input on the statistical patterns that separate the two — things like predictability of word choice and variation in sentence rhythm. The result is a single AI-likelihood percentage from 0 to 100.

What does the percentage mean?

It is the model's estimated likelihood that the text is AI-generated. Below 30% reads as likely human, above 70% as likely AI, and the middle band genuinely means the model cannot tell. Because the score is probabilistic, a number near the boundary should be treated as inconclusive rather than as a close call decided in either direction.

Is the AI detector 100% accurate?

No AI detector is 100% accurate — including this one. Detection is probabilistic: polished human writing (especially by non-native speakers) can look AI-like, and lightly edited AI text can look human. Treat the score as one signal, never as sole proof of misconduct.

Can it detect ChatGPT and GPT-5 text?

The detector looks for stylistic patterns common to large language models, including ChatGPT-family models, Claude and Gemini. Heavily edited or deliberately 'humanized' AI text is harder to detect — which is true for every AI checker on the market.

How much text do I need for a reliable check?

At least 120 characters (roughly 3–4 full sentences) — the tool won't run below that. A few paragraphs gives a far more reliable score, because short texts don't contain enough signal for any detector to judge.

Is this AI checker free?

Yes — free with no sign-up and no word-count teasers. Check up to 20,000 characters per run.

AI Detector — Free AI Checker

Paste any text and get an AI-likelihood score from 0 to 100%, produced by a purpose-built detection model. Works for ChatGPT-style text, essays, articles and more.

0 / 20 000 символов

Здесь появится ваша оценка вероятности ИИ.

Why use this AI detector?

A 0–100% score, not a guess

Get a precise AI-likelihood percentage and a plain-English reading of it, instead of a vague red/green light.

Purpose-built classifier

Works on any English text

Essays, blog posts, product reviews, cover letters, academic writing — paste anything above a few sentences.

Honest about limits

AI detection is probabilistic. The tool states its confidence and warns against using it as sole proof.

How to use the ai detector

Paste the text
Add the text you want to check — at least 3–4 sentences gives the most reliable reading.
Click “Detect AI”
The detector analyzes rhythm, word choice, structure and other stylometric signals.
Read the verdict
You get a verdict, a likelihood percentage and the specific signals found in the text.

About this AI detector

AI-generated text is everywhere, and telling it apart from human writing is genuinely hard. This free AI detector gives you a precise answer rather than a vague one: a dedicated classifier — trained on human and machine-written text, not a chatbot asked for its opinion — scores your text from 0 to 100% AI likelihood.

Teachers use it to get a first read on submissions, editors to screen freelance work, and hiring managers to sanity-check cover letters. Paste at least a paragraph: like every detector, it needs enough text to find a pattern, and very short samples produce unreliable scores.

A word of honesty that most AI checkers won't print: every detector, including this one, produces false positives. Formal prose and non-native writing patterns can resemble AI output. Use the verdict as a starting point for a conversation, not as a final judgment.

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