AI Detector - Free AI Checker for ChatGPT, GPT-5 & Gemini

Best free AI detector - simply paste your text to instantly get an overall AI score and advanced sentence by sentence detection.

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AI Detector - Free AI Checker for ChatGPT, GPT-5 & Gemini 网站预览

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AI detector made to Preservewhat's human.

GPTZero detects AI content from ChatGPT, GPT-5, Gemini, and checks writing quality to make every word worth reading.

99%Accuracy

10 millionUsers

380kEducators

Add to Google Docs - it‘s free!

Scan for AI Improve writing Check Citations

Paste your text or

Upload files

Try an example:

ChatGPTClaudeHumanAI + HumanPolished by AIParaphrased by AI

0/10,000charactersUpgrade

Privacy Guarantee

ScanScan

Premium Features

Video proof of the writing process.GPTZero in Google Docs

Advanced Insights.Go beyond a basic AI checker

Find plagiarism.Try our plagiarism detector

Improve your writing.Free grammar check and feedback

Your toolkit to preserve quality,authentic writing

Writing Replay

Advanced Scan

Plagiarism Checker

Writing Feedback

Video proof of the writing process. GPTZero in Google Docs

Watch documents being written, view copy and pastes, and check for unnatural typing patterns.

The most precise, reliable AI detection results on the market

Scan top AI models\
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Classify AI text from major AI models, from ChatGPT to Gemini, Llama, Claude and more.\
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Try AI detector Get unparalleled, advanced accuracy\
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Independent benchmarking shows GPTZero Advanced Scan has best-in-class accuracy.\
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Try Advanced Scan Verify real writing\
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Opt for video replay and human writing verification to prove your authentic voice\
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Explore writing report Connect your classroom\
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Easily integrate with learning management systems including Canvas, Moodle, and Google Classroom.\
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Schedule a demo Improve with AI Tutor\
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Build responsible writing habits with custom AI-powered writing feedback tools.\
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Try AI writing tutor Detect plagiarism\
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Ensure originality and check if content was copied from outside sources without attribution.\
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Try plagiarism checker

OUR TECHNOLOGY

Leading research in AI content detection modeling

Our AI detection model contains 7 components that process text to determine if it was written by AI. We utilize a multi-step approach that aims to produce predictions that reach maximum accuracy, with the least false positives. Our model specializes in detecting content from Chat GPT, GPT 4, Gemini, Claude and LLaMa models.

See how it works

Enterprise-Certified AI Detection Trusted by Leading Organizations

INTEGRATIONS

Built-in AI detection for classrooms and workspaces

Bring the most precise AI content checker directly into the software you use every day.

Chrome Google Docs Classroom Canvas Moodle Zapier API

Free

$0.00/ month

10,000 words per month

Basic AI Scan

5 Free Advanced Scans

Choose Plan

Essential

$8.33/ month

Billed $99.96 annually

150,000 words per month

Basic AI Scan

Up to 150,000 words per month

Premium AI detection models

Plagiarism scanning

Advanced Grammar and Writing feedback

Choose Plan

Premium

GPTZero reviews

“The best AI checker"according to our customers and community

TechCrunch

Kyle Wiggins

GPTZero was the only consistent performer, classifying AI-generated text correctly. As for the rest … not so much.

CEO, Transit Pluto Studios

Samantha Warren

GPTZero has been incomparably more accurate than any of the other AI checkers. For me, it’s the best solution to build trust with my clients.

President, American Federation of Teachers

Randi Weingarten

This tool is a magnifying glass to help teachers get a closer look behind the scenes of a document, ultimately creating a better exchange of ideas that can help kids learn.

Director of Learning

Catalina Ramirez

The granular detail provided by GPTZero allows administrators to observe AI usage across the institution. This data is helping guide us on what type of education, parameters, and policies need to be in place to promote an innovative and healthy use of AI.

Teaching Assistant, University of Minnesota

Helen Dombrock

After talking to the class, each student we compiled with GPTZero as possibly using AI ended up telling us they did, which made us extremely confident in GPTZero’s capabilities.

Assistant Professor of Economics, University of Toronto

Kristina McElheran

Harvard Law School

Justin Curl

I'm a huge fan of the writing reports that let me verify my documents are human-written. The writing video, in particular, is a great way to visualize the writing process!

Investor, Washington Partners

Frank Li

Excellent chrome extension. I ran numerous tests on human written content and the results were 100% accurate.

Writer

Nate Walker

Outstanding! This is an extraordinary tool to not only assess the end result but to view the real-time process it took to write the document.

Outlook News

GPTZero is the best AI detection tool for teachers and educators.

FAQs about GPTZero

Everything you need to know about GPTZero and our chat gpt detector.

Can’t find an answer?You can talk to our customer service team.

What is GPTZero?

GPTZero is the first and leading AI detector that allows you to identify specific content in a document or text that has been generated by a large language model (LLM), such as ChatGPT. Founded in January 2023, GPTZero has served over 10 million users to date and works with 100+ organizations in education, hiring, publishing, legal and more.

How does AI detection work?

AI detectors work by looking for patterns in text that are more likely to have been written by a machine than a human. The most common factors they look for include: Perplexity: Is the writing obviously predictable? Burstiness: How much variation is there in the sentence length and style? Style: Is the tone and writing style overly generic or repetitive? GPTZero uses its own proprietary model that takes hundreds of factors into consideration and boasts the highest detection accuracy in the industry

Is GPTZero’s AI detector accurate?

Yes. Independent benchmarks, like our partners at Penn State's AI Research Lab, and our own large-scale testing show that GPTZero is the most accurate AI detector, with a 99% accuracy rate when spotting AI-generated text vs. human writing. This means we correctly classify AI writing 99 out of 100 times and keep misclassification of text to an absolute minimum. Our results were further validated on RAID, a comprehensive, third-party benchmark where GPTZero was shown to be the most accurate AI detector in North America, detecting 95.7% of AI texts while only incorrectly predicting 1% of human texts as AI, an accuracy that jumps to over 99% when filtering to modern LLMs like GPT4. Unlike many competitors, GPTZero can reliably detect "mixed documents" (where human and AI writing are combined) with a 96.5% accuracy rate. While no AI detector can ever truly be 100% perfect, we are committed to being a leader in responsible adoption of AI generation and AI detection technologies.

How do I use GPTZero’s AI detection tool?

You can start using GPTZero straight away in 3 easy steps:

Paste Text or Upload Document: Paste in raw text or upload your file for review and press ‘Scan’. For scans over 10,000 characters, create a free account first.
See Your Results: GPTZero will suggest what percentage of your text is likely to be AI-generated and highlight the specific phrases it has detected.
Download our Chrome Extension for Google Docs and web: View AI detection and typing pattern metrics on any page, allowing you to spot AI-created content with ease.

Who is GPTZero for?

GPTZero is the most trusted AI content checker in education, both for teachers and students who use GPTZero to guide conversations on academic integrity and writing improvement. GPTZero is used in over 3500 colleges and 100s of institutions. We also serve publishers, recruiters, copy-writers, marketers and businesses where authentic and quality writing truly matters.

Does the GPTZero AI Content Checker only detect ChatGPT outputs?

No. GPTZero works across a wide range of AI language models, including but not limited to ChatGPT, GPT-5, GPT-4, GPT-3, Gemini, Claude, Llama, Deepseek, and AI services based on those models. Our detector is designed for the highest accuracy rate regardless of which model may have produced the text.

In our latest model release, we’ve updated the majority of our training data, including more AI documents from: OpenAI – GPT4.1,GPT4.1-mini, o3, o3-mini Gemini – 2.5 Pro, 2.5 Flash, 2.5 Flash-Lite Claude, Sonnet 4 as well as a few other models.

Which languages does GPTZero support?

GPTZero fully supports English, German, Portuguese, French and Spanish with industry-leading accuracy. We are also constantly used in many other languages and in over 100 countries.

What is the best AI detector?

GPTZero is consistently rated the most accurate and reliable AI detector across various use cases.

Reliability: In 2025, G2 ranked GPTZero the #1 most trusted and reliable AI tool, above Grammarly.
Accuracy: GPTZero is the most accurate AI detector with 99% accuracy rates across diverse datasets, independently reviewed by AI labs at top institutions. Independent reviewers, including Tom’s Guide, testing all popular detectors named GPTZero the most accurate.
Best Interpretability: GPTZero is the only detector that explains exactly why text is AI with natural language. GPTZero also has the most accurate sentence-level AI detection, with color-coded highlights on exactly where AI is used in an essay.

What are the limitations of AI Detectors?

No AI detector is 100% accurate, and AI itself is changing constantly. Results should not be used to punish or as the final verdict. Accuracy improves with longer inputs (document-level results are stronger than paragraph or sentence-level) and is strongest on English prose.

GPTZero is the only AI detector de-biased for ESL (English Second Language) learners, which many competitors do not take into account. We repeatedly train our model to reduce false positive rate for ESL writing to 1%. We also monitor our datasets to transparently prevent any bias in AI detection training data.

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