General
What is AI Killer?
AI Killer is a free AI content detector. Paste any text and it estimates how likely the text was generated by AI such as ChatGPT, Claude, or Gemini, returning a 0–100 score with sentence-level highlighting.
Is AI Killer free?
Yes. It is completely free and requires no account or sign-up. Paste your text, click Detect AI, and get an instant result.
Which AI models can it detect?
It looks for general AI writing patterns rather than fingerprinting one product, so it works across major models including ChatGPT (GPT-4/5), Claude, and Gemini.
Do I need to create an account?
No. There is no login, no email, and no payment required to use the detector.
Accuracy & limits
How accurate is AI Killer?
AI detection is probabilistic and not 100% accurate. It can flag human writing as AI (false positives) and miss AI text (false negatives), especially on short, formal, or non-native English writing. Use the score as a signal, not proof.
Can it flag human writing as AI?
Yes. False positives are a known limitation of every AI detector, particularly for formal or non-native English writing. A high score is a reason to look closer, not a verdict.
Why did my own writing get a high AI score?
Detectors measure how predictable and uniform your text is. Clear, formal, consistent human writing can resemble AI output statistically. Varying sentence length and adding specific detail usually lowers the score.
What's the minimum text length?
Aim for at least 100 characters (about 15+ words). Below that there isn't enough signal, so scores are pulled toward the middle and become unreliable.
Academic use
Can teachers use this to prove I used ChatGPT?
No. A detector score is a probability, not proof, and false positives happen. It should never be the sole basis for an accusation of cheating or academic misconduct.
Does it work like Turnitin's AI score?
It uses similar ideas — measuring AI-like writing patterns — but it is a separate, free tool. Turnitin's AI indicator is also imperfect and is meant to inform a human decision.
Should I check my essay before submitting?
It can be a helpful gut check: it shows which passages read as generic so you can revise them. Just remember it can flag writing you wrote entirely yourself.
Privacy & technical
Do you store the text I submit?
Your text is used only to produce your result and is not stored beyond what is needed to process it. Avoid pasting sensitive personal information. See our Privacy Policy for details.
Will I get the same score if I check the same text twice?
Yes. The same text returns the same score every time — there is no randomness — so results are reproducible.
Does it support languages other than English?
The interface is available in multiple languages and the detector is optimized for Korean. For best accuracy, use the language the model is tuned for; a note is shown when the language can't be confidently detected.
Still have a question?
Read how accurate AI detectors are and why detectors flag human writing, see how to use AI Killer, or contact us.