Paste your text below to check whether it was written by AI. Our AI detector is trained to detect content generated by GPT-5, Gemini, Claude, Llama, and more. Click here to learn how our AI detector uses AI Click here to learn how our AI detector uses AI What is an AI detector? An AI detector (also called an AI checker or AI content detector) analyzes text to evaluate how likely it was generated by AI. It searches for patterns common to AI-generated text and determines how likely it is the writer used a platform like GPT-4, GPT-5, ChatGPT or Claude. AI content detection is used by educators, editors, SEO professionals, and businesses to make sure content is original. How accurate is Quillbot’s AI detector? Our free AI detector tool is continuously updated to account for emerging patterns in AI-generated text as AI evolves, staying ahead of identifying typical AI tells to flagging patterns you may not realize indicate AI. Our AI scanner offers clear results, fast analysis, and strong privacy protections to help keep your writing clean. Trained on the latest LLMs Stay ahead of the curve with software updated regularly to scan for new patterns from GPT-5, Claude, ChatGPT, Gemini, and other LLMs as they evolve. Accuracy and reliability Detect AI text reliably with a 99% detection rate, according to independent evaluations from RAID . Get AI likelihood estimates you can trust and avoid false positives. Multilingual support Work with AI-generated text across multiple languages. Instant detection Get results in seconds, allowing you to review text without slowing down your workflow. Privacy-first design Keep your text secure, so your sensitive or unpublished content stays protected. Insights and explanations Avoid using patterns and commonly AI-generated phrases to help you avoid being flagged in the future. Downloadable reports Get results you can share with other educators, editors, or teams. Transparent results Get clear scores and explanations to help users understand why text may be flagged as AI-generated. How to use Quillbot’s free AI checker Run scan & review What makes Quillbot different from other AI detection tools? Paraphrasing and grammar checking tools help millions of writers refine text and express their ideas. But most AI checkers can’t differentiate between text that’s been entirely generated with AI tools and text that’s been refined using AI assistance. Quillbot offers a more reliable AI Detector. How do AI detectors differentiate between human and AI-generated text? AI detectors evaluate common indicators of AI-generated writing such as how predictable the text is, variation in sentence structure, and repetitiveness. The tool assigns a percentage score from 0 to 100% indicating the likelihood that the text was generated by AI. A minimum of 80 words is required to scan. As with any AI checker; the longer the text the better the results. 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. When the AI Detector tool identifies sections of text as likely AI-written, it provides explainers with insights into why that text was flagged. As with any AI detector, this score is not a guarantee, but it is a useful signal when authorship matters. AI Detector: Explore free vs. Premium features Try writing in different tones of voice. Up to 1,200 words per scan Up to 6 scans per day 1 free rewrite cards explaining necessary changes Includes Grammar Checker, Humanizer, and Plagiarism Checker No word limit for detection scans Unlimited scans Unlimited rewrite cards explaining necessary changes Full access to all Quillbot tools for a complete writing workflow Certify your human-written content If you’re a site owner or blogger, get a Quillbot certificate for your published page and add a verification badge to your site. Build trust with readers, reduce AI skepticism, and keep proof of authenticity one click away. Go beyond text: Detect AI in images AI isn’t limited to text, images can be also created with AI Image generators . Ensure images and visuals used in your work are not generated by AI with Quillbot's AI image detector. AI Image generators What’s the difference between an AI detector and a plagiarism checker? An AI detector checks if content was likely generated by AI. A plagiarism detector checks if content was copied from somewhere else. A piece of writing can be original but AI-generated, or copied from another source without involving AI. Using both tools together helps evaluate authenticity and originality. Who can use Quillbot’s AI detector? Review assignments and essays for AI-generated writing to support academic integrity SEO and digital professionals Check articles and web content for AI-generated patterns before publishing to maintain credibility Review campaign copy, blogs, and product content for AI patterns to maintain audience trust Publishers and content teams Screen submissions or drafts for potential AI-generated text Do it all with Quillbot Punctuation Checker Punctuation Checker MLA Citation Generator MLA Citation Generator Paragraph Rewriter Paragraph Rewriter Chicago Citation Generator Chicago Citation Generator Grammar Checker Grammar Checker Sentence Rewriter Sentence Rewriter Citation Generator Citation Generator Plagiarism Checker Plagiarism Checker APA Citation Generator APA Citation Generator AI Story Generator AI Story Generator Cover Letter Generator Cover Letter Generator AI Lyric Generator AI Lyric Generator AI Product Title Generator AI Product Title Generator AI Email Writer AI Email Writer AI Acronym Generator AI Acronym Generator AI Product Name Generator AI Product Name Generator AI Caption Generator AI Caption Generator AI Text Generator AI Text Generator AI Title Generator AI Title Generator AI Meta Description Generator AI Meta Description Generator AI Job Description Generator AI Job Description Generator AI Paragraph Generator AI Paragraph Generator Hashtag Generator Hashtag Generator AI Instagram Caption Generator AI Instagram Caption Generator AI Article Rewriter AI Article Rewriter AI Image Generator AI Image Generator AI Logo Generator AI Logo Generator AI Background Generator AI Background Generator AI Poster Generator AI Poster Generator AI Thumbnail Generator AI Thumbnail Generator Background Remover Background Remover AI Tattoo Generator AI Tattoo Generator AI Random Image Generator AI Random Image Generator AI Illustration Generator AI Illustration Generator AI Youtube Thumbnail Generator AI Youtube Thumbnail Generator AI Photo Editor AI Photo Editor AI Art Generator AI Art Generator AI Album Cover Generator AI Album Cover Generator AI Flyer Generator AI Flyer Generator AI Banner Generator AI Banner Generator AI Character Generator AI Character Generator AI 3D Model Generator AI 3D Model Generator AI Sketch Generator AI Sketch Generator AI Book Cover Generator AI Book Cover Generator

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This tool saves me a ton of time. I mostly use its Paraphraser, grammar and AI Detector. It's definitely worth the Premium version. Great assistant I really love how this app assists me when I experience blocked thoughts while writing, and ensures the good quality of my works through grammar checks and AI detection, so I can adjust my word choices in case they seem to contain lots of AI vocabulary. All in all, it gives me confidence in submitting my work. It gives me accurate results that no… It gives me accurate results that no other ai checker gives, I myself spent time on writing my coursework just for an AI checker like Zerogpt to tell me its at least 60 percent AI? Quillbot checker gives me 0 percent AI on my work which wrote myself and that kinda gives me a sense of relieve. Thank you. Real-time AI Content detection where you already work Detect AI-generated content while chatting or editing inside Quillbot’s AI Chat and browser extensions. No switching tools. No delays. AI detector FAQs What is an AI content detector? Quillbot’s AI content detector is a tool used for analyzing text to check whether or not it was generated using AI writing software. It looks for writing patterns that are associated with AI, like repetitive or predictable phrases, and then gives a confidence score between 0 and 100% that states the likelihood of the text being AI or human written. Why Quillbot's AI detector is different from other AI detection tools? There are two major factors that sets apart Quillbot’s AI detector from other similar tools. F irst, it distinguishes how the text was created using AI (whether it was entirely AI-written, entirely human-written, or human-written with some AI refinement). This way, you get a clearer understanding of how your text was created, rather than just told whether or not it was made with AI. Second, feedback is provided for each section of your writing, so you will always have a clear understanding of which sentences and phrases are flagged for AI writing. This makes the editing process much simpler, as you can save time by focusing primarily on rewriting the flagged sections of your text. How accurate is Quillbot’s AI detector? QuillBot is independently evaluated on RAID , a third-party benchmark covering ChatGPT, GPT-4, GPT-5, Claude, Gemini, Mistral, Llama, and more. QuillBot's free AI writing detector is built on advanced LLM-based linguistic pattern analysis, continuously trained on large datasets to stay current with the latest AI writing systems. Our models are designed to deliver high accuracy across all content types, lengths, and writing styles, while minimizing false positives to ensure human-written content is not wrongly flagged. Key things that make our detection reliable: Up-to-date models: Keeps pace with the latest AI writing tools like ChatGPT as they evolve Broad model coverage: Detects content from all major AI systems including ChatGPT, Gemini, Claude, and Copilot Low false positive commitment: Built to avoid flagging human writing Multilingual support: Detects AI text across multiple languages What affects accuracy: Longer texts (300+ words) produce more reliable scores than short inputs Heavily paraphrased or lightly AI-edited content is harder to detect for any AI checker Formulaic human writing (academic definitions, legal copy, structured templates) can score higher than expected for any AI writing detector Note that no AI Detector can provide 100% accuracy. As language models like ChatGPT continue to evolve, detection tools must continuously adapt to keep up, which is why our models are regularly retrained and refined. Results are probability estimates, not verdicts. Use them as one input in a wider review. Up-to-date models: Keeps pace with the latest AI writing tools like ChatGPT as they evolve Broad model coverage: Detects content from all major AI systems including ChatGPT, Gemini, Claude, and Copilot Low false positive commitment: Built to avoid flagging human writing Multilingual support: Detects AI text across multiple languages Longer texts (300+ words) produce more reliable scores than short inputs Heavily paraphrased or lightly AI-edited content is harder to detect for any AI checker Formulaic human writing (academic definitions, legal copy, structured templates) can score higher than expected for any AI writing detector What models does Quillbot’s AI detector detect? Quillbot’s free AI detector is designed to analyze text generated by modern large language models (LLMs). This includes AI models like GPT-5, GPT-4, Claude, Gemini, ChatGPT , Llama, and other similar models. Since AI models are always changing and evolving, Quillbot’s AI detector is regularly updated to account for newer AI models and versions. This allows the tool to stay more accurate and effective at spotting AI writing as technology advances. What is Quillbot's AI Detector false positive rate? All AI checkers present the risk of false positives, or incorrect identification of AI use. Heavily paraphrased writing and highly formulaic content, such as legal jargon or academic writing, is more likely to present a false positive. Quillbot’s AI checker accounts for AI-refined text specifically, reducing false positives for text that was written by a human but edited with AI. Educators should use AI checkers as one input in a wider conversation with students. Our free 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. Can Quillbot’s AI detector detect AI writing for teachers? Yes, Quillbot’s AI detector can be helpful for teachers by determining the likelihood of whether their students' writing was created using the help of AI writing tools. What AI detector do teachers use? Teachers use various different AI detectors for scanning and evaluating student assignments for AI. Quillbot’s AI detector is a great resource for educators to check their classroom work for AI, while also being useful for students who want to make sure their writing assignments are not flagged as being AI-written. Can Quillbot detect partially AI-generated text? Yes. Quillbot’s AI checker can also help to determine if a piece of writing features a mix of both human and AI writing. Rather than just simply evaluating an entire text as a single block of writing, the tool examines writing patterns line-by-line, identifying and flagging specific sections as being AI-generated. Does Quillbot’s AI detector verify human originality? No. Quillbot’s AI detector can not verify whether a piece of writing was created by a human or original. The tool simply analyzes a piece of text and searches for common AI writing patterns and estimates the probability of it being created with the use of an AI writing tool. Can Quillbot’s AI content detector detect all types of AI-generated content? Quillbot’s AI detector is specifically designed to detect AI-generated text. It doesn’t analyze images, videos, or other types of media. If you would like to check whether an image was AI-generated, you can use Quillbot's AI Image Detector . AI Image Detector Who benefits from Quillbot’s AI detector? Quillbot’s AI detector can benefit professionals across many different industries. Educators can use it for evaluating student assignments, while journalists and editors can screen drafts or submissions from other writers. SEO teams and digital marketers can use AI detectors to review web content prior to publishing and maintaining quality across their content pipelines. Researchers and technical writers can use the tool for reviewing reports or documentation, and enterprise teams can utilize it for managing internal or client-facing content. Can Quillbot’s AI detector detect content quality issues beyond AI-generated content? No, the AI detector is solely used to detect AI writing. Quillbot has many other tools, including a Grammar checker , Plagiarism checker, Paraphraser and a humanize AI tool that you can use separately, in addition to the AI detector, if you want to improve your writing further beyond AI detection. Grammar checker Can Quillbot’s AI detector detect plagiarism? No. Quillbot’s AI detector can help you to scan and find AI-written content within a piece of writing, but it does not scan text for plagiarism. Use our Plagiarism Checker if you want to scan a piece of text for plagiarism. Plagiarism Checker Does Quillbot’s AI detector support multiple languages? Yes. Quillbot’s AI detector supports 20+ languages. This makes it useful for international teams, educators, and publishers working with multilingual writing. Supported languages include English, Spanish, French, Portuguese, and many others. Can the AI content detector tool suggest improvements for my content? Yes. While Quillbot’s AI detector focuses on identifying common AI writing patterns within text, it also connects directly with Quillbot’s other writing tools to help refine your flagged content. If sections of text are identified as being likely written by AI, you can quickly improve or adjust the writing by using our integrated tools within the same workflow. For example, you can use Quillbot’s Humanizer tool to rewrite your flagged text sound more natural and align it with your own voice or use the Paraphraser to rewrite sentences to sound more original. How reliable are AI detection results? Our AI detector simply identifies and flags text that might be AI-generated, but it is not perfect. Use your best judgment when reviewing results. Never rely on an AI detector alone when making decisions that could impact someone's career or academic standing. Will Quillbot’s AI detector work in Chat & Extensions? (coming soon) Yes. Quillbot plans to integrate its AI detector directly into Quillbot Chat and browser extensions. This will give users the ability to check text for AI-generated patterns without ever having to leave their primary writing space.