Free ChatGPT Detector

Detect text generated by ChatGPT, GPT-4, and other OpenAI models. Free, accurate analysis across 16 statistical indicators. Free for the first 1,500 words - no sign-up, no credit card.

Free to 1,500 WordsNo Sign-Up RequiredNo Credit CardUnlimited Re-ChecksError Rate PublishedInstant Results

Looking for a free AI detector for your ChatGPT text? Most AI detection tools like GPTZero, Originality.ai and Turnitin charge per scan or require a monthly subscription. This one reads the first 1,500 words of any document free, with no sign-up and no credit card, and checks a full document of up to 30,000 words for €4.99 once rather than every month. ChatGPT is the most widely used AI writing tool, and detecting its output has become a priority for educators and institutions worldwide. Our free ChatGPT detector analyzes text for the specific statistical patterns that characterize ChatGPT output - including its tendency toward uniform sentence lengths, overuse of certain phrases, and predictable paragraph structures. Whether you want to verify your own writing or check a document for ChatGPT content, our tool provides detailed analysis across 16 indicators. It works with text from all ChatGPT versions including GPT-3.5, GPT-4, and GPT-4o.

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Why Use a ChatGPT Detector?

Most Common AI Tool

ChatGPT accounts for the majority of AI-generated academic content. Our detector is tuned to recognize its specific patterns.

Evolving Models

As ChatGPT improves, its output becomes harder to detect. Our tool analyzes statistical patterns that persist across model versions.

Academic Compliance

Universities specifically mention ChatGPT in their AI policies. Checking your work against ChatGPT detection is essential.

Self-Verification

If you used ChatGPT for any part of your workflow, verify that your final text does not carry its statistical fingerprint.

How We Detect ChatGPT Text

  • Sentence Length Uniformity: ChatGPT produces remarkably consistent sentence lengths across all its versions.
  • Vocabulary Diversity: ChatGPT reuses a limited set of 'favorite' words and phrases more than human writers.
  • Burstiness: ChatGPT maintains a constant complexity level, lacking the natural variation of human writing.
  • AI-Characteristic Phrases: We detect 60+ phrases that ChatGPT disproportionately favors, including 'delve,' 'multifaceted,' and 'it is important to note.'
  • Transition Word Frequency: ChatGPT heavily overuses 'Furthermore,' 'Moreover,' 'Additionally,' and similar transitions.
  • Paragraph Uniformity: ChatGPT paragraphs tend to be remarkably similar in length and structure.
  • Passive Voice Usage: ChatGPT relies on passive voice more than typical human writers.

Tips to Avoid ChatGPT Detection

  1. If you used ChatGPT for ideas, rewrite everything in your own words from scratch.
  2. ChatGPT loves the word 'delve' - avoid it and similar AI-favored vocabulary.
  3. Break up uniform sentence patterns. Add short, punchy sentences between longer ones.
  4. Remove excessive transition words at paragraph beginnings.
  5. Add personal examples, specific data, and unique insights that ChatGPT cannot generate.
  6. Read aloud and revise anything that sounds formulaic or robotic.

Frequently Asked Questions

The first 1,500 words are free, with no sign-up, no credit card and no cap on how often you run it. Unlike GPTZero, Originality.ai or Turnitin, checking a full ChatGPT text is a single €4.99 payment rather than a subscription - and it includes 14 days of unlimited re-checks.
The free tier covers your first 1,500 words, which is enough to check an abstract or a chapter and not enough to check a thesis - that is the paid check, at €4.99 once. We keep the free tier genuinely useful because it is how people find us, and because a student who cannot pay should still be able to see what a detector sees.
Our tool uses similar statistical analysis methods as paid tools. While paid services may offer additional features like plagiarism checking or API access, our core AI detection analysis is comprehensive and effective for individual document checks.
Yes. Our detector analyzes statistical patterns common across all ChatGPT versions, including GPT-3.5, GPT-4, GPT-4o, and their variants.
No AI detector is 100% accurate, but our tool provides reliable statistical analysis. Longer texts yield more accurate results.
While paraphrasing can reduce detection scores, statistical patterns often persist. Our tool analyzes multiple dimensions, making it harder to evade detection.

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