GPTZero
An AI detection tool used by over a million users worldwide to identify content created by AI models
Dubbed the world’s number one AI detector, GPTZero boasts over a million users as we speak.
As its name says, the tool is made to identify content generated by AI models — including ChatGPT, GPT3, GPT4, Bard, and others — to bring transparency and to enable users to differentiate between human- and AI-generated content. GPTZero even provides a Chrome extension called Origin for seamless use.
For educators, there’s GPTZeroX – a suite of tools that includes a plagiarism scoring system which provides a comprehensive score indicating how much of a document is AI-written. It also highlights sentences in a document that are detected to be written by an AI. Moreover, GPTZeroX supports batch uploads so that educators can upload multiple files at once.
For broader organizational use, GPTZero offers an API that can be integrated into existing apps and services. It has been adopted by academic institutions such as the University of California, Berkeley, Duke University, and the National University of Singapore, as well as organizations like Product Hunt and Translate.com.
Categories Detection
Video Overview ▶️
What are the key features? ⭐
- AI detection: This is GPTZero's key feature and it can identify content written by various AI models like ChatGPT, GPT3, GPT4, and Bard.
- Education-focused tools: GPTZero adds a few extra bells and whistles for educators through its GPTZeroX service. For instance, they get to see a comprehensive score indicating how much of a document was written by AI and highlight every sentence written by AI.
- API: Organizations can connect to GPTZero through an API. Among those adopting this approach are various academic institutions as well as websites like Product Hunt and Translate.com.
- Chrome extension: The GPTZero Origin AI Content Detector Chrome Extension allows anyone to quickly determine what content was written by a human or AI everywhere on the internet.
Who is it for? 🤔
GPTZero is primarily made for educators and organizations interested in detecting AI-generated content. However, it is also used by small businesses outsourcing their content production to third parties - they want to make sure the content they're getting is truly unique. And GPTZero's AI detection capabilities help them do that.
Examples of what you can use it for 💭
- High school teacher: Scans student essays quickly to flag potential AI use and spark discussions on ethical writing, saving hours on manual reviews.
- University professor: Integrates it via Canvas to check mixed human-AI assignments, providing sentence-level highlights that guide feedback without false accusations.
- Content marketer: Uses the Chrome extension on blog drafts to ensure originality before publishing, catching generic AI phrasing that could hurt SEO.
- Freelance recruiter: Analyzes cover letters for authenticity, spotting AI-generated responses to maintain fair hiring processes with low false positives.
- News editor: Runs articles through scans to verify human authorship amid rising AI tools, using advanced insights to build trust with readers.
Pros & Cons ⚖️
- It's easy to use, just copy/paste the content you want to check
- The Chrome extension can come in very handy
- Works with all the popular AI models
- Could be bypassed with spelling and grammar mistakes
FAQs 💬
What is GPTZero?
GPTZero is a leading AI detector that identifies text generated by large language models like ChatGPT, GPT-4, Gemini, and Claude, and it helps users spot AI content in documents or online text with high accuracy. Founded in 2023 by Princeton grad Edward Tian, it has served over 10 million users across education, publishing, and business, focusing on preserving authentic human writing.
How accurate is GPTZero?
GPTZero claims 99% accuracy in distinguishing AI from human text on benchmarks like RAID, with just 1% false positives, and it performs even better at over 99% on modern models like GPT-4, though real-world tests show it dips to 80-98% on mixed or edited content.
What languages does GPTZero support?
It fully supports English, German, Portuguese, French, and Spanish with top accuracy, and users report solid results in over 100 countries for other languages too, though performance shines brightest on English prose.
How do I get started with GPTZero?
Just paste text up to 10,000 characters or upload a file like a PDF or DOCX on the free tier, hit scan, and see results with AI percentages and highlights; for longer scans or advanced features, sign up for a free account first.
Who should use GPTZero?
Teachers and students in over 3,500 colleges rely on it for academic integrity checks, while publishers, recruiters, and marketers use it to ensure original content in high-stakes writing.
Does GPTZero only detect ChatGPT?
No, it catches output from a wide range including GPT-5, GPT-4, Gemini 2.5, Claude Sonnet 4, LLaMA, and Deepseek, with recent updates boosting detection for these advanced models.
What are GPTZero's limitations?
Like all detectors, it isn't 100% perfect and can struggle with short texts, heavy editing, or non-English content, plus it might flag ESL writing falsely about 1% of the time despite de-biasing efforts; always pair it with human review.
How does GPTZero compare to Turnitin or Originality.ai?
It edges out on AI-specific accuracy at 95-99% versus Turnitin's broader plagiarism focus, but some 2025 tests show Originality.ai slightly better on mixed texts; GPTZero wins for interpretability with sentence highlights.
Is GPTZero free to try?
Yes, the basic version lets you scan up to 10,000 characters without paying, and it includes a Chrome extension for quick web checks; premium unlocks unlimited scans and extras like plagiarism tools.
Can GPTZero detect paraphrased AI text?
It handles paraphrasing better than many thanks to its Paraphraser Shield, catching about 96.5% of mixed or edited AI, but 2025 studies note evasion drops accuracy to 70% in tough cases, so it's not foolproof.
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Last update:
November 12, 2025
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