Instant AI Probability Score
Get a clear percentage score showing the likelihood that text was AI-generated. No waiting, no guessing — results arrive in seconds.
Free AI Detector — No Sign-Up Required
Is This Text Written by AI? Find Out in Seconds with DetGPT
DetGPT is a free AI content detector that identifies ChatGPT, Claude, Gemini, and other AI-generated text with high accuracy. Used by educators, editors, and HR teams worldwide. Just paste and check.
Trusted by 100,000+ users — no account, no cost, no catch.
Free AI Checker
Paste Your Text Below
DetGPT analyzes your text and returns an AI probability score instantly. Works with essays, articles, emails, cover letters, and more.
Powered by SJTU ArguGPT Detection Model
Why DetGPT Is the AI Detector You Can Actually Trust
Built on academic research and tested against real AI-generated content from every major model.
Catches ChatGPT, Claude, Gemini — and Newer Models Too
DetGPT's detection engine is trained on outputs from all major AI writing tools. Whether the text came from ChatGPT 4o, Claude 3.5, or Gemini Ultra, the AI detector flags it. The model updates regularly to keep pace with new AI releases.
Completely Free. No Account. No Limits on Pasting.
Most AI detectors lock their best features behind a paywall or cap free usage at a few hundred words. DetGPT gives you the full AI checking experience for free — paste any length of text and get a percentage-based AI probability score immediately.
What DetGPT Can Do for You
More than just a ChatGPT detector — a complete AI content verification toolkit.
Detects AI Text in 30+ Languages
English essays, Japanese blog posts, Chinese academic papers — DetGPT's AI detector works across 30+ languages with the same accuracy.
Private by Design
Your text is never stored or shared. DetGPT processes each check in memory and discards it immediately. No account means no data trail.
Academic Integrity Tool
Professors and teachers use DetGPT to verify student submissions. Check essays, dissertations, and lab reports against AI generation patterns.
Content & SEO Verification
Before you publish, run your content through DetGPT. Ensure your blog posts, product descriptions, and landing page copy are genuinely human-written.
API Access for Teams
Need to check hundreds of documents? DetGPT offers API access and batch processing for educational institutions and enterprise content teams.
How to Use DetGPT — 3 Simple Steps
The fastest free AI detector on the web. No account, no setup, no hassle.
01
Paste Your Text
Copy the text you want to check — a student essay, a blog article, a job application, or any piece of writing you suspect may be AI-generated. Paste it directly into the DetGPT text box.
- Works with any length of text
- Supports 30+ languages
02
Click 'Check' — Results in Seconds
Hit the Check button and DetGPT's AI detection model processes your text instantly. No loading screen, no queue. You'll see an AI probability percentage appear within a few seconds.
The AI probability score reflects how closely the text matches statistical patterns from large language models.
03
Read Your AI Detection Report
DetGPT returns a clear percentage score. Scores above 80% strongly indicate AI-generated content. Below 30% suggests human writing. Use the result to make informed decisions about the text.
Lightly edited AI text may score lower. Run the original and edited versions separately to compare.
See the FAQWhat Users Say
Reviews from educators, editors, and HR professionals using DetGPT
"This AI checker is indispensable for reviewing student reports. The detection accuracy is high and it saves me a lot of time."
Prof. Michael Thompson
University Lecturer · University of Oxford
"The perfect AI checker for verifying the originality of articles submitted by freelance writers. Highly reliable."
Sarah Mitchell
Content Director · Media Company
"We use it to verify the authenticity of job application essays during hiring. Thanks to this AI checker, we can evaluate candidates fairly."
David Wilson
Head of HR · IT Company
Frequently Asked Questions About DetGPT
Everything you need to know about using the DetGPT AI detector.
Is DetGPT really free to use?
Yes. The core AI detection feature on DetGPT is completely free — no account, no credit card, no word limit. Paste your text and check as many times as you need. Enterprise API access is available separately for high-volume users.
Which AI models can DetGPT detect?
DetGPT can detect text generated by ChatGPT (GPT-3.5, GPT-4, GPT-4o), Claude (1, 2, 3), Google Gemini, Perplexity AI, and other large language models. The detection model is updated regularly to keep up with new AI writing tools.
How accurate is DetGPT's AI detection?
DetGPT achieves over 95% accuracy on standard AI-generated text. Accuracy may be slightly lower for heavily edited AI content, very short texts (under 100 words), or text that has been paraphrased through another tool. For best results, check texts of 200 words or more.
Is my text private when I use DetGPT?
Yes. DetGPT does not store, log, or share any text you submit. The detection runs in memory and the text is discarded immediately after processing. No account means there is no user profile associated with your submissions.
Can DetGPT detect AI text in languages other than English?
Yes. DetGPT supports AI text detection in over 30 languages including Japanese, Chinese (Simplified and Traditional), Spanish, French, German, Korean, and more. The accuracy is highest for English but remains reliable for other major languages.
What does the AI probability score mean?
The score represents how likely it is that the text was generated by an AI model. A score above 80% is a strong indicator of AI-generated content. A score between 30–80% is inconclusive and may indicate mixed or lightly edited AI text. Below 30% suggests the text is likely human-written.
Does DetGPT offer API or bulk checking?
Yes. DetGPT offers API access and batch processing for educational institutions, publishers, and enterprise teams that need to check large volumes of documents. Contact hi@detgpt.com for pricing and integration details.
Start Checking AI Text for Free — Right Now
No account. No credit card. No word limit.
Paste your text into DetGPT and know the truth in seconds.
Free for everyone.