ChatGPT Detector — Free, No Sign-Up
Instantly check if text was written by ChatGPT, GPT-4, or GPT-4o. Our free ChatGPT detector uses ML models to spot AI-generated patterns with 95%+ accuracy. 100% free, unlimited, no sign-up required.
How to Detect ChatGPT Text — What This Tool Checks
Our ChatGPT detector analyzes text for the statistical and linguistic patterns specific to ChatGPT output. ChatGPT-generated text tends to have unusually low perplexity (predictable word choices), consistent sentence rhythm, and characteristic filler phrases like "It is important to note that" or "In conclusion."
The detector runs the same AI content detection pipeline used across our free AI detector, but with model-specific signal weighting tuned for ChatGPT (GPT-3.5, GPT-4, GPT-4o). You get sentence-level results showing exactly which parts read as AI-generated.
If text is flagged, use our humanize AI text tool to rewrite it. It removes the ChatGPT patterns that trigger detection.
Signs of ChatGPT-Generated Text
Low Perplexity
ChatGPT picks the statistically most likely next word — producing text that feels "safe" and predictable. Our detector measures this with burstiness and perplexity scores.
Filler Phrases
Phrases like "It is worth noting," "In today's world," and "It is important to consider" appear far more in ChatGPT output than human writing.
Uniform Sentence Length
Human writing varies dramatically in sentence length. ChatGPT defaults to medium-length sentences with little variation — a strong detection signal.
Topic Transitions
ChatGPT uses formulaic transitions ("Furthermore," "Moreover," "In conclusion") that follow predictable structural patterns our models have learned to recognize.
Hedging Language
Over-hedging ("Some might argue," "It could be said that") is a signature of AI caution built into ChatGPT's safety training.
Generic Examples
ChatGPT tends to use vague, universally applicable examples rather than specific, personal ones — another signal our detector picks up.
ChatGPT Versions We Detect
Our ChatGPT detector identifies text from all current OpenAI models:
ChatGPT Detector FAQ
Is this ChatGPT detector completely free?
Yes. Our ChatGPT detector is 100% free with unlimited usage. No sign-up, no credit card, no hidden fees.
How accurate is the ChatGPT detector?
Our tool achieves 95%+ accuracy on ChatGPT output (GPT-3.5, GPT-4, GPT-4o). Accuracy is highest on texts of 200+ words.
Can it detect GPT-4 and GPT-4o specifically?
Yes. Our detector handles GPT-3.5, GPT-4, and GPT-4o. It also detects Claude, Gemini, and Llama — all major AI writing models.
What makes ChatGPT text different from human text?
ChatGPT uses predictable word choices (low perplexity), consistent sentence lengths, formulaic transitions, and hedging phrases that trained ML models can reliably detect.
My human-written text got flagged — why?
Formal or academic writing styles can resemble AI patterns. Detection is probabilistic, not definitive. Use results as a signal alongside your own judgment.
What should I do if my content is flagged as ChatGPT?
Use our AI Humanizer to rewrite flagged text. It transforms ChatGPT-pattern sentences into natural human writing that passes detection. Humanize AI text free →
Check Any Text with Our Free ChatGPT Detector
95%+ accuracy. Detects GPT-3.5, GPT-4, GPT-4o and all major AI models. Free, unlimited, no sign-up.
Need to detect all AI models? Try our full AI detector →