Free AI Detector & AI Checker
Paste any text below and instantly see how likely it was generated by AI. It's not just a ChatGPT detector — AI Killer checks writing from any model, including ChatGPT, Claude, Gemini, and more, and gives you an overall AI score from 0 to 100 plus sentence-level highlighting so you can see exactly which parts look AI-written.
AI Killer is free, requires no account, and returns the same score for the same text every time. Remember that no AI checker is perfect — use the result as a signal, not a verdict.
Sentence-level highlights
See the exact lines that read as AI.
Every major model
ChatGPT, Claude, Gemini — not just one.
Instant & free
No sign-up. Same text, same score.
Honest by design
A probability, never a false verdict.
How it works
Paste your text
Drop in the text you want to check. 100+ characters gives a more reliable score.
Detect AI
The detector analyzes sentence-level patterns and returns a 0–100 AI score in seconds.
Review the result
See the overall score plus the exact sentences that look AI-generated, highlighted.
Why AI Killer
Sentence-level highlighting
Not just a score — see which sentences trigger AI signals so you know exactly what to review or revise.
Works across models
Detects general AI writing patterns, so it covers ChatGPT, Claude, Gemini, and more rather than one tool.
Free, no sign-up
Paste and check instantly. The same text always returns the same score, so results are reproducible.
Honest about limits
Shown as a probability, never a verdict. We surface false-positive risk so you don't over-trust a number.
Learn about AI detection
What the Common App actually does (and doesn't do) to detect AI in your essays and activities section — plus how to avoid being wrongly flagged.
Read →Do Colleges Check Application Essays for AI?Whether admissions offices actually screen essays for AI, the tools involved, and how false positives factor in.
Read →Does Turnitin Check for AI?How Turnitin's AI detection works, how reliable it is, and what teachers actually see.
Read →Why Do AI Detectors Flag My Writing?The real reasons detectors flag human-written text, explained simply, plus how to lower false positives.
Read →Frequently asked questions
What is an AI detector?+
An AI detector analyzes writing patterns — word choice, sentence structure, and predictability — to estimate the probability that a piece of text was generated by an AI model rather than written by a human.
Is the AI checker free?+
Yes. AI Killer is completely free with no account required. Paste your text, click Detect AI, and get an instant 0–100 score.
How accurate is the AI detection?+
AI detectors are probabilistic and not 100% accurate. They can flag human writing as AI (false positives) and miss AI text. Treat the score as one signal among many, never as proof.
Does it detect ChatGPT, Claude, and Gemini?+
Yes. The detector looks for general AI writing patterns, so it works across major models including ChatGPT (GPT-4/5), Claude, and Gemini rather than a single tool.
⚠️ 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.