GPTZero

Curious how much of the internet is already AI-generated?

RecommendedGPTZero is a leading and highly accurate AI detection tool, particularly strong for educational and professional use cases, offering comprehensive features beyond basic AI detection.

GPTZero is a leading AI detector that identifies AI-generated text at document, sentence, and word levels. It supports multiple languages and is trusted by over 17 million users and 100+ organizations in education, hiring, publishing, and more.

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Key Features:

AI Detector: Scans for potential AI text in documents with sentence and word-level highlighting.
Advanced AI Scan: Provides in-depth results on AI probabilities and multilingual detection.
Chrome Extension (Origin): Detects AI in real-time while browsing and integrates with Google Docs for writing reports.
Plagiarism Checker: Detects content from outside sources to ensure originality.
Hallucination Detector: Verifies claims and finds reliable sources for citations.

Pros

Educators needing to foster academic integrity and detect AI misuse in student assignments.
Writers aiming to ensure their content sounds authentic and avoid false accusations of AI generation.
Organizations (hiring, publishing, cybersecurity) requiring robust AI detection for various use cases.

Cons

No AI detector is 100% accurate, and results should not be used as a final verdict for punishment.
Accuracy increases with longer text inputs; document-level classification is more reliable than sentence-level.
The classifier may sometimes flag other machine-generated or highly procedural text as AI-generated.

Pricing

freemiumFree tier

Starting at:$12.99/month, billed annually (Premium; annual pricing shown)

Free tier:Free AI detection is available on the homepage, with a 10,000-character scan limit shown.

Price verified on the live site 2026-07-12 · pricing page

Categories:

Writing & Content Education & Learning Security & Privacy

Tags:

AI detection plagiarism checker grammar checker hallucination detection authorship verification Chrome extension Google Docs integration academic integrity content authenticity

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Quick Decision

Try if: You should try GPTZero if you are an educator, writer, or organization needing a highly accurate and reliable AI detection tool with integrations for common platforms like Google Docs and Chrome, and features like plagiarism and hallucination detection.

Skip if: Skip if you are looking for a tool to generate AI content, or if you require a completely free solution for very high volume scanning without any limitations.

Not for: Users seeking a tool for generating AI content, as GPTZero is solely for detection.; Individuals looking for a free tool with unlimited scanning capabilities, as free tiers have character limits.

Trust Signals

Founded
2023
Users
17 million+
Team Size
medium

Compliance

SOC 2FERPA compliant

Notable Customers

American Federation of Teachers (AFT)Penn State’s AI Research Lab

Tech Details

Platforms

webapichrome_extension

Integrations

Google DocsCanvasZapier

AI Model
Proprietary model trained on diverse human and AI-generated text, including GPT-4.1, Gemini 2.5, Claude, Llama, Deepseek

Open Source

Support

Channels

help centeremail

Company

Name
GPTZero

GPTZero was founded by Edward Tian, a former journalist and Princeton student, to address the impact of AI on writing and academic integrity. The company's mission is to provide tools to detect and safely adopt AI technologies.

FAQ

What is GPTZero?

GPTZero is the most trusted AI detector for checking if content was written by an LLM such as ChatGPT, GPT-5, GPT-4, Gemini, or Copilot. It tells you where AI is used at document, sentence, and word level and supports English, Spanish, French, German, and other languages.

How accurate is GPTZero's AI detector?

GPTZero is consistently rated as the most accurate AI detector, with a 99% accuracy rate for spotting AI-generated text vs. human writing, a false negative rate under 2%, and a false positive rate under 1%. It also reliably detects 'mixed documents' with 96.5% accuracy.

What are the limitations of AI detectors like GPTZero?

No AI detector is 100% accurate, and results should not be used as the final verdict. Accuracy improves with longer inputs, and it is strongest on English prose. The classifier is not trained to identify heavily modified AI-generated text and can sometimes flag procedural text as AI-generated.

Alternatives

GPTZeroEducation & General

Originality.aiSEO & Marketing

TurnitinUniversities

QuillBotTeachers (Paper)

CopyleaksEnterprise

ZeroGPTQuick Checks

Use Cases

Educators needing to foster academic integrity and detect AI misuse in student assignments.
Writers aiming to ensure their content sounds authentic and avoid false accusations of AI generation.
Organizations (hiring, publishing, cybersecurity) requiring robust AI detection for various use cases.