Trusted AI Detector & AI Checker by QuillBot
Paste your text below to check if it was written by AI. Our AI Detector is trained on GPT-5, Gemini, Claude, and Llama and trusted by millions of users.
Add text to begin analysis
AI-generated
Human-written & AI-refined
Human-written
Our AI detector flags text that may be AI-generated. Use your best judgment when reviewing results. Never rely on AI detection alone to make decisions that could impact someone's career or academic standing.
What is an AI Detector?
An AI detector is a tool designed to analyze written content and identify whether it was created by a human or generated by artificial intelligence. It can detect content from major models, including ChatGPT, Gemini, Claude, and Llama, and accurately distinguish between fully AI-generated text and content that has been refined using assistive writing tools.
AI detectors are widely used by educators, businesses, publishers, and content creators to verify originality, protect content quality, and promote transparency. Supporting all major languages, our AI Checker provides detailed feedback, helping users quickly verify the authenticity of content in seconds.
More clarity, less confusion with QuillBot's AI Detector
Paraphrasing and grammar checking tools are ethical uses of AI writing technology. They help millions of non-native English speakers and writers refine their text and express their ideas fluently. cultural bias
But most AI detectors can’t tell the difference between text that’s been created with generative AI tools—such as ChatGPT, GPT5, GPT4, GPT3, Gemini, Llama, Claude and others—and text that’s been refined using assistive tools. This leads to false positives and
So we built a more reliable AI detector.
How to use QuillBot’s AI Detector
Add content
Input text: Upload or paste your text into the AI Detector.
Select language: Choose English, French, German, or Spanish.
Check length: Make sure your text is at least 80 words.
Run scan
Analyze text: Press the “Detect AI” button at the bottom of the tool.
Receive report: Get detailed results in just a few seconds.
Review feedback: Receive a total score and line-by-line report.
Edit content
Interpret results: Review any highlighted sections of text.
Revise text: Rewrite any AI-generated sections if needed.
Re-scan: Run another scan to double-check your revisions.
Add content
Input text: Upload or paste your text into the AI Detector.
Select language: Choose English, French, German, or Spanish.
Check length: Make sure your text is at least 80 words.
Run scan
Analyze text: Press the “Detect AI” button at the bottom of the tool.
Receive report: Get detailed results in just a few seconds.
Review feedback: Receive a total score and line-by-line report.
Add content
Input text: Upload or paste your text into the AI Detector.
Select language: Choose English, French, German, or Spanish.
Check length: Make sure your text is at least 80 words.
Why choose QuillBot's AI Detector
Our AI detector doesn’t just identify text generated by tools like ChatGPT, GPT-4, GPT-5, Claude, Gemini, Llama, and other large language models. It also detects text refined with paraphrasers or grammar checkers-including our own-because it’s continuously trained on evolving AI text patterns.
Here's what else sets our AI checker apart.
Detailed analysis
Know exactly which part of the text appears to be AI-generated
High accuracy
Advanced models for highly accurate results
Downloadable reports
Download in-depth PDF reports for every detection
Multilingual support
Supports all languages with accurate detection
Fast
Receive your AI detection report within seconds
The Technology Behind QuillBot’s AI Detector
QuillBot’s AI Detector analyzes patterns to estimate the likelihood that a text is human written or AI generated. Instead of flagging individual words, our detector notices structural signals like repetition, generic language, and lack of variation in tone.
Our detector works because it is trained on large sets of human- and AI-written texts generated using models like GPT-4, GPT-5, Claude, Gemini, Llama, and other modern large language models. It uses metrics such as perplexity (how predictable the text is) and burstiness (how much sentence length varies) to identify writing patterns typical of machines.
When the result is unclear, our model tends to classify texts as human written, which reduces false positives. For the most accurate results, analyze your entire text at once, and make sure it meets the length requirement. Always interpret results in light of your own knowledge.
For every text, you’ll get a probability score that suggests its likely source. As with any AI detector, this score is not a guarantee, but it is a useful signal when authorship matters.
An AI detector that’s perfect for any project
QuillBot's AI Detector for mobile
Conveniently access our AI Detector as part of our mobile app for Apple or Android. Use QuillBot’s AI Detector to quickly identify AI-generated or AI-refined text. Plus, use our included Paraphraser, Translator and Grammar Checker to perfect your writing all in one place.
An AI detector that’s perfect for any project
Work projects
The last thing you want is to turn something in to your boss that wasn’t created by you. Use our AI Checker to update your project with your original work.
Blog posts
Make sure your content reaches its audience. Algorithms will penalize your text if it contains too much AI. Originality sets you apart, grows your following, and builds trust.
Research papers
Important papers you write for school or work should let your original writing shine. With QuillBot’s AI Detector, you can feel confident that the text you turn in meets your standards of ethical AI usage.
Why writers love us
AI Detector FAQs
How accurate is QuillBot’s AI Detector?
QuillBot’s AI Detector uses advanced LLM-based linguistic pattern analysis to identify AI-generated text, including outputs from GPT-4, GPT-5, Claude, and Gemini. Our models are continuously trained on large datasets to stay current with evolving AI writing systems, ensuring high accuracy and reliability across all content types.
How is QuillBot's AI Detector different from other AI detectors?
There’s two main reasons that QuillBot’s AI Detector is different from other AI detectors. First, we distinguish how AI was used to create your content. Our analysis will tell you if each section of writing was:
1) AI-generated
2) AI-generated & AI-refined
3) human-written & AI-refined
4) human-written
This way, you don’t just know if AI may have been used to generate the content. You can also understand how assistive tools may have been used in the writing process.
Second, we offer feedback on every section of your writing, so you always know exactly which sentences appear to contain AI-generated content. This makes your editing process much easier, as you can quickly identify and adjust any problematic sections of your text.
Who benefits from QuillBot's AI Detector?
QuillBot's AI Detector is a valuable tool for educators, students, teachers, writers, freelancers, copywriters, and anyone else who needs to identify AI-generated text.
Can QuillBot’s AI Detector detect AI writing for teachers?
Yes, QuillBot’s AI Detector for teachers can report the likelihood that text in essays and other class assignments is AI-generated.
Can QuillBot’s AI content detector detect all types of AI-generated content?
QuillBot’s AI Detector can only detect text and not images, video, or other rich media content.
Can QuillBot’s AI Detector detect content quality issues beyond AI-generated content?
The AI writing detector only identifies text generated by artificial intelligence. QuillBot has a host of other tools, including a Grammar Checker Paraphraser humanize AI
Can the QuillBot's AI content detector tool detect plagiarism?
No. The AI Detector content checker will inform you of any AI-generated content, while our Plagiarism Checker
Can the AI content detector tool suggest improvements for my content?
No, the AI Detector will simply give you a percentage between 0% and 100% that represents the likelihood that AI-generated or AI-augmented content is in your text.
Does the QuillBot's AI Checker support multiple languages?
QuillBot's AI Detector accurately analyzes text in all languages.
What other languages does QuillBot AI detector support?
QuillBot AI detector currently supports 20+ languages, including English.
Also, the tool is available in 6 languages: