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.
Built for honest AI detection
Sentence-level analysis · Free · Unlimited
Check instantly with no sign-up. Your text is used only to produce the result and is never stored.
Detection-model-based analysis
Every result is a probability from a trained detection model — a signal, never proof. No AI detector is 100% accurate.
Supported AI models
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.
Completely free · unlimited · no sign-up
AI Killer's checker works without login, payment, or daily limits. The same text always returns the same score, so you can revise and re-check to see exactly what your edits changed. It isn't tied to one model — it reads general AI writing patterns, so it works on essays, cover letters, blog posts, and any other text. Nothing to install; it runs right in your browser.
As with every free detector, results are probabilistic signals. No AI checker is 100% accurate, so treat the score as a reference, never as proof or the sole basis for an accusation.
Pick the page that fits your task
This home checker handles any text. If you have a specific job, the focused pages go deeper — ChatGPT Detector for GPT-written text, free GPT Killer for pre-submission coursework checks, Cover Letter AI Checker for applications, and AI Content Detector if you're comparing AI detection with plagiarism checking.
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.
Is the AI checker 100% accurate?+
No. No AI detector is 100% accurate. Because detection is probabilistic, it can flag human writing as AI (false positives) and miss AI-generated text (false negatives), especially on short, formal, or non-native English writing. Treat the score as one signal among many, never as proof, and never as the sole basis for an accusation.
Can I use it to check a cover letter or personal statement?+
Yes. You can paste a cover letter or personal statement to see which sentences read as generic or AI-like before you submit. Keep in mind it can flag writing you wrote yourself, so use it as a gut check rather than a verdict — the strongest defense is your own specific detail and voice.
Which AI models does it detect?+
It targets general AI writing patterns rather than fingerprinting one product, so it works across major models including ChatGPT, GPT-4/5, Claude, Gemini, DeepSeek, and Llama. Newer models are harder to detect, so scores are a signal, not a guarantee.
Do you store the text I check?+
Your text is used only to produce your result and is not stored beyond what is needed to process it. There is no account and no login. Avoid pasting sensitive personal information, and see our Privacy Policy for details.
⚠️ 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.