ChatGPT Detector: Was This Written by ChatGPT?

A free ChatGPT checker and GPT detector

This ChatGPT checker works on anything you can paste: essays, homework answers, emails, cover letters, reviews and blog posts. It acts as a general GPT detector too, so text from GPT-4o, GPT-5 and other OpenAI models is scored the same way. Because it looks at how the writing behaves rather than at a list of known outputs, it also flags text from Claude, Gemini and other chatbots.

ChatGPT’s writing fingerprints

Every model has habits. ChatGPT’s are familiar to anyone who has read a lot of its output, and they’re the patterns this detector weighs most heavily:

• Signature vocabulary: “delve,” “tapestry,” “testament,” “realm,” “navigate,” “crucial,” “robust,” “seamless.”
• Framing openers: “In today’s fast-paced world,” “In the ever-evolving landscape of…”
• Hedged balance: every claim softened, every point paired with a counterpoint, no clear opinion.
• Groups of three: “fast, efficient, and reliable.”
• Heavy formatting: bolded lead-ins, bullet lists and headings where a paragraph would do.
• The recap ending: “In conclusion…” or “Ultimately…” followed by a summary of the text you just read.
• Email tells: “I hope this email finds you well” and “Please don’t hesitate to reach out.”

One tell is never enough; plenty of people write “crucial.” The detector looks at how many patterns appear together and how evenly the text is built, which is far more telling than any single word.

ChatGPT vs. other AI models

Claude, Gemini and Llama share most of these habits, with their own variations. Because the detector models those shared traits, the same check works for all of them. You can use this page as a ChatGPT checker, or the general AI detector for any model.

Using a ChatGPT detector fairly

If you’re a teacher or manager, remember that a ChatGPT detector estimates likelihood. It does not prove authorship. Talk to the writer, ask about their process and look at drafts before making a decision. Our guide on AI detector accuracy explains the known failure cases, including the higher false positive rates for non-native English writers.

Wrote it with ChatGPT and need it to sound like you?

If you use ChatGPT for drafts, run the text through the AI humanizer to remove these patterns, then add your own details. Check the result here before you publish.