GPT Zero - Accurate
AI Detector & AI Checker
Check if your text was written by ChatGPT, Gemini, or Claude. GPT Zero is the world's most trusted AI detector for writers and educators.
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Linguistic Diagnostics
Measures how predictable word choices are.
Measures variance in sentence length & rhythm.
Actionable Recommendations
Trusted by students & professionals from
Advanced AI Detection in 3 Intelligent Steps
Our multi-layered linguistic engine separates genuine human nuance from artificial statistical patterns with 98.5% precision.
Perplexity Mapping
Evaluates vocabulary predictability. AI models constantly choose the statistically most expected words, while humans introduce creative phrasing.
Burstiness & Cadence
Measures sentence length variation. Human writing features dynamic bursts of short and long clauses, whereas AI writing has rigid uniform rhythm.
LLM Model Fingerprinting
Cross-references syntactic patterns against probability distributions from ChatGPT (GPT-5.6), Claude, Gemini & Llama for confident verdicts.
Accurate, Private, and 100% Free Forever
No sign-up walls, credit card forms, or hidden paywalls. Paste your essay, article, or assignment and receive an instant sentence-by-sentence analysis.
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Trained on GPT-5.6, Claude 3.7, Gemini & Llama 4 outputs
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Zero data retention — your text is never stored or trained on
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Detailed sentence-level highlighting and actionable improvement tips
Accurate Detection Across All Major AI Models
Continuously updated neural engines calibrated to spot synthetic fingerprints from frontier LLMs, reasoning models, and AI writing assistants.
ChatGPT
OpenAI GPT-5.6 / 4o
Gemini
Google 3.7 Flash & Pro
Claude
Anthropic 3.7 Sonnet
Llama
Meta Llama 4 & 3.3
Jasper & Copilot
Marketing & Writing AI
Understand AI Detection Scans
Our ChatGPT Detector looks at your content sentence by sentence and gives each one a score.
The Most Accurate AI Detector in the Market
Students, teachers, and professionals around the world trust us to check their content.
98.5% Detection Accuracy
We get it right almost every time. Our tool spots AI text from ChatGPT (GPT-5.6), Gemini 3.7 Flash, Claude Opus 5, Llama 4, and other AI writers.
Lightning Fast Results
Check up to 10,000 words in just a few seconds. You get your results right away.
100% Free Forever
No hidden costs and no credit card needed. Scan as much content as you want for free.
Zero Data Retention
We don't save your text or use it for anything. What you paste stays private.
All Major AI Models
Works with ChatGPT (GPT-5.6), Gemini 3.7 Flash, Claude Opus 5, Llama 4, and other AI writing tools.
No Sign-up Required
Just paste your text and click scan. No account needed, no forms to fill out.
Ensure Academic Integrity with Confidence
Whether you're working on essays, research papers, or a thesis, our AI detector helps you make sure your content looks authentic before you turn it in.
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Check essays before submitting to professors
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Verify research papers are 100% human-written
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Educators can verify student submissions instantly
Protect Your SEO Rankings & Brand Authenticity
Google likes content that sounds like a real person wrote it. Our AI detector helps writers, bloggers, and marketing teams check their work before publishing.
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Verify freelancer and outsourced content quality
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Audit blog posts before publishing for SEO compliance
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Maintain authentic brand voice across all content
What is AI Content Detection?
AI content detection looks at text to figure out if a human wrote it or if it came from AI tools like ChatGPT (GPT-5.6), Gemini 3.7 Flash, Claude Opus 5, or Llama 4.
Our detector uses smart technology to look at how sentences are put together.
Perplexity Analysis
We check how predictable the text sounds. AI tends to write in patterns, while people write with more variety.
Burstiness Detection
We look at how sentence lengths change. People naturally mix short and long sentences, while AI keeps things more even.
What's the Difference Between Human Written and AI Content?
Explore how our detection engine analyzes perplexity, burstiness, and sentence rhythm to spot AI text.
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Dynamic Sentence Burstiness
Humans naturally mix short punchy observations with complex multi-clause sentences.
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Rich Vocabulary & Idioms
Human writers incorporate slang, subjective opinion, personal anecdotes, and unpredictable word choices.
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Organic Flow & Tone
Tone fluctuates naturally based on emotion, context, and individual author voice.
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Predictable Token Choices
LLMs select statistically most probable words, creating low perplexity patterns.
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Uniform Sentence Rhythms
Sentences maintain monotonous structure and length throughout the document.
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Repetitive Transition Clichés
Overuses filler phrases like "Furthermore", "In summary", and "It is important to note".
See the AI
analysis in action.
We don't just guess. Our technology looks at each sentence to check for sentence patterns and word choices that AI tends to use.
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Detailed sentence-by-sentence highlighting
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Distinguishes between Human, AI, and Mixed content
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Trained on millions of academic and creative texts
How to Make AI Text More Human-Like
Actionable techniques to improve readability, eliminate generic phrasing, and pass AI detection checks naturally.
1. Vary Sentence Rhythm & Length
AI tools write with uniform sentence lengths. Mix short 3-word punchy observations with longer multi-clause sentences to increase natural burstiness.
2. Add Personal Voice & Perspective
AI models lack personal experience. Share subjective opinions, specific real-world examples, and first-person anecdotes that machines cannot write.
3. Eliminate AI Transition Clichés
Remove repetitive AI filler words like "Furthermore," "In conclusion," and "It is important to note." You can also use an AI humanizer to rewrite robotic sentences into more natural, conversational content.
4. Use Active Voice & Precise Details
Swap passive voice generalizations for strong active verbs, specific statistics, and exact names instead of high-level summaries.
5. Use Unpredictable Vocabulary
AI selects statistically common tokens. Incorporate rare synonyms, regional idioms, and conversational phrasing to increase perplexity.
6. Read Content Out Loud
Read your drafted content out loud to catch awkward AI phrasing, unnatural cadence, and robotic pacing before publishing.
Tailored AI Detection for Every Industry
Protecting authenticity across education, publishing, recruitment, and digital search.
Academic Integrity
Verify student submissions, term papers, and thesis documents with sentence-level scoring.
Explore Education →Publishing & Media
Protect editorial standards, screen freelance submissions, and safeguard brand reputation.
Explore Publishing →Recruitment & Hiring
Scan candidate application essays, cover letters, and written assessments in seconds.
Explore Hiring →SEO Content Audits
Ensure content complies with Google Search Helpful Content guidelines and avoids penalties.
Explore SEO Verification →Supercharge Your Detection Workflow
Access instant sentence-level AI scanning directly in your browser or integrate our enterprise REST API into your platform.
Scan Content Across the Web
Detect ChatGPT, Gemini, and Claude text instantly inside Google Docs, web articles, emails, and online essays without switching tabs.
- Instant right-click text scanning
- Deep Google Docs integration
- Sentence-level probability highlights
Integrate AI Detection REST API
Integrate enterprise-grade AI content verification into your applications, LMS platforms, recruitment pipelines, or editorial CMS.
- High-speed RESTful JSON endpoints
- Multi-language code snippets (cURL, Node, Python, PHP, Go)
- Secure API key authentication & rate limits
Trusted by Users All Over the World
Here's what students, teachers, and professionals say about our AI detector.
"I was so worried about my essay getting flagged falsely. GPT Zero helped me identify the problematic sentences so I could rewrite them in my own voice. Lifesaver!"
"We hire dozens of freelancers and needed a way to verify originality. This tool is fast, accurate, and the free version is surprisingly generous. Highly recommend."
"I appreciate that it doesn't just say 'AI' or 'Human' but highlights the specific parts. It helps me have constructive conversations with students about their writing."
"I use ChatGPT for outlines but write the rest myself. GPT Zero helps me ensure my final draft reads naturally and won't be penalized by Google."
"The most reliable detector I've found. The interface is clean and easy to use. I love that I don't need to sign up to check a quick paragraph."
"Essential tool for my workflow. I check every piece of content before publishing. The accuracy in distinguishing between GPT-5 and human text is impressive."
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Featured & Trusted By Leading Institutions
Frequently Asked Questions
Everything you need to know about our AI content detector.
How accurate is the AI detector?
Our AI detector gets it right about 98.5% of the time when spotting content from ChatGPT (GPT-5.6), Gemini 3.7 Flash, Claude Opus 5, Llama 4, and other AI tools.
Is the AI detector completely free?
Yes, completely free. No hidden charges, no credit card needed, and you can scan as often as you like.
Which AI models can you detect?
We can spot content from all the big AI writing tools including ChatGPT (GPT-5.6), Google Gemini 3.7 Flash, Anthropic Claude Opus 5, Meta Llama 4, Jasper AI, and many others.
Is my content private and secure?
Yes, your text stays private. We don't store anything you paste. Once we check it, it's gone.
Can AI detection help with SEO?
Yes it can. Google prefers content that reads like a human wrote it. Checking your work with our AI detector before publishing can help meet Google's quality standards.