Free GPT Killer
A GPT killer catches text written by ChatGPT, GPT, and other AI models. Paste it below to instantly see the AI likelihood as a 0–100 score, a visual graph, and sentence-level highlights.
AI Killer's GPT killer is completely free, needs no account, and has no daily check limit (how detection works).
What 'GPT killer' means
'GPT killer' is the popular name for tools that catch GPT-written text — in Korea it's best known as the AI-detection service used by universities alongside the CopyKiller plagiarism system, which is why students search for it before submitting coursework. Institutional versions are contract-based, so individuals usually can't run the same check on their own draft beforehand. This page is a free GPT killer built for exactly that pre-submission check: no account, no payment, no daily limit.
It won't return the identical score an institution's tool would — algorithms differ — but it reads the same family of signals (uniform sentence rhythm, stock transitions, missing specifics), which makes it a solid early warning.
Checking beats evading
Paid 'bypass' rewriters promise to beat GPT killers. We don't recommend them: they degrade the writing with awkward synonym swaps, stop working when detection models update, and — most importantly — submitting AI-written work as your own is the misconduct, whether or not it slips past a tool.
The reliable path is to flip the order: use AI for research and outlining, write the final sentences yourself, then run this check and rework whatever gets highlighted. Keep your drafts and notes — if a false positive ever raises questions, your process is the strongest evidence of authorship.
Frequently asked questions
What is a GPT killer?+
A GPT killer estimates how likely a piece of text was generated by ChatGPT or another GPT model. It analyzes writing patterns and shows a 0–100 score, a proportion graph, and sentence-level highlights.
Is this the same as CopyKiller's GPT Killer?+
No — that's a contract-based institutional service. This is an independent free checker that reads the same family of signals, built for checking your own draft before you submit.
Is the GPT killer free and unlimited?+
Yes. AI Killer's GPT killer is completely free, requires no account, and has no daily limit on checks. Paste your text and check instantly.
If I pass here, will I pass my university's check?+
No guarantee — institutions use different tools and thresholds. But heavy highlighting here is a reliable warning that institutional tools will likely flag the same passages, so fix those sentences first.
Is any GPT killer 100% accurate?+
No. GPT killers are probabilistic and can both flag human writing and miss AI text, especially on short passages. Use the result as a signal, never as the sole basis for a decision.
⚠️ Disclaimer: AI Killer results are probabilistic signals and are not 100% accurate. Detectors can flag human writing as AI, so do not use this as the sole basis for accusations of plagiarism, cheating, or academic misconduct.