AI Checker
Plagiarism Checker
Grammar Checker
Content Quality
Guideline Checker
Readability Checker
Fact Checker
Chrome Extension
Our AI Detector, available to try below, has been shown by multiple independent studies to be the most accurate AI Detector they tested. It is accurate on GPT-5, ChatGPT, Claude, Gemini, Grok and all other Popular AI writing tool text.
Want to Show Your Writing is Your Own?
With our Chrome Extension you can watch a replay of how a document was created.
Want to Show Your Writing is Your Own?
With our Chrome Extension you can watch a replay of how a document was created.
Try the AI Detector for free above. Free scans are limited. For higher word count limits, saved reports, plagiarism checking, readability, grammar, fact checking, team tools, and API access, sign up for the full version.
Use AI detection as one signal, not a final decision. Review other details like writing history and drafts before any high consequence decisions. Always keep a human reviewer in the loop.
Trusted by Industry Leaders
A Complete Content Integrity Suite
AI Detector By Originality.ai™ offers a complete suite of patented AI tools for writers, students, editors, marketers, web publishers, and educators including, AI detection, Plagiarism Checking, Fact Checking & Grammar Checking.
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Deep Scan ›
See why text is likely flagged as AI + how to ethically edit it, so your work is more likely identified as original!
AI Checker ›
Accurate AI Detector in peer reviewed studies. Try our free AI Checker above.
Plagiarism Checker ›
See if text has been plagiarized from anywhere on the internet.
Content Quality Score ›
Confidently check if content is low, good, or high quality before you click submit.
Readability Checker ›
Optimize readability for your target audience to communicate clearly.
Bulk Scan ›
Scale content QA and scan an entire website’s content easily.
AI Allowance ›
Now in Beta: Flexibly adjust the AI% that you permit for each scan.
Fact Checker ›
Use our fact checking aid to help ensure your content is factually correct.
Step 1
Paste or Upload Text
Login to Originality.ai and paste, upload, or enter a URL to input text into the editor.
Step 2
Select Scan Types
Choose which type of scan you’d like to run, AI Allowance, Plagiarism, Content Quality, Grammar and more!
Step 3
Click Scan
Click ‘Scan’ to get scores for each scan type. Was your text flagged as Likely AI? Run Deep Scan for tips.
Our accurate, patented AI Checker is built with the extra features you need to publish with confidence!
At Originality.ai we aren’t for or against AI content, but believe you should have transparency before you click publish or submit.
The complete Originality.ai patented content quality solution includes an: AI Checker, Plagiarism Checker, Readability Checker, Fact Checker and Grammar Checker; Read More.
In internal testing and 3rd party peer-reviewed studies, the Originality.ai AI detector, has repeatedly been found the most accurate at detecting AI content.
Originality.ai is built to detect AI text from leading LLMs: including GPT-5.5, GPT-5, Claude Opus 4.7, Claude Opus 4.8, Claude Fable 5, Gemini 3, Gemini 3.1 Pro, Gemini 3 Flash, Gemini 3.5 Flash, Grok 4.1 Fast, Grok 4.3, DeepSeek V3.2, V4 Flash, and V4 Pro and other popular AI writing tools.
Any AI detector accuracy claim that is not transparently supported by methodology, benchmark data, and independent or reproducible analysis should be viewed skeptically.
Study
Results Shown
Accuracy comparison of AI text detection tools on AH&AITD
Percentage correct for GPT-4 papers
Mean accuracy at FPR=5% for detectors on non-adversarial outputs
Mean accuracy for ChatGPT-generated and AI rephrased articles
Mean AUROC of GPT-3.5 vs. human-written, GPT-4 vs. human-written, mixed human/GPT-3.5 vs. human-written, mixed human/GPT-4 vs. human-written, translated vs, human-written
Mean accuracy for (a) human vs. AI and (b) human vs. disguised
Originaltiy.ai
97.09
100
85
100
87.9
86.5
GPTZero
63.77
57
67
45
77.28
84.5
Writer
69.05
40
Not included
Not included
Not included
Not included
CopyLeaks
Not included
100
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TurnItIn
Not included
100
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62
Not included
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Binoculars
Not included
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80
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FastDetectGPT
Not included
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74
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ZeroGPT
Not included
83
66
92
Not included
85
GPT-2 Output Detector
Not included
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Not included
85
Not included
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Sapling
66.66
33
Not included
Not included
75.92
Not included
Winston
Not included
Not included
71
Not included
Not included
77
GPTkit
55.29
Not included
Not included
Not included
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Not included
Zylalab
68.23
Not included
Not included
Not included
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SEO.ai
Not included
83
Not included
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Scribbr
Not included
69
Not included
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Grammica
Not included
62
Not included
Not included
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Crossplag
Not included
69
Not included
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OpenAI
Not included
40
Not included
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IvyPanda
Not included
40
Not included
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GPTRadar
Not included
31
71
Not included
Not included
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Content at Scale
Not included
52
Not included
50
Not included
Not included
ContentDetector.ai
Not included
7
Not included
Not included
Not included
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GLTR
Not included
Not included
63
Not included
Not included
Not included
RoBERTa-Base (GPT2)
Not included
Not included
59
Not included
Not included
Not included
RoBERTa-Large (GPT2)
Not included
Not included
57
Not included
Not included
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RoBERTa-Base (ChatGPT)
Not included
Not included
45
Not included
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LLMDet
Not included
Not included
35
Not included
Not included
Not included
AI Detectors without an in-depth analysis verified by third party studies should be used with caution.
Sign up now ›
Proven Third-Party Accuracy
You don’t just need to take our word for it. Independent third-party studies have also found the Originality.ai AI detector to be accurate.
Accurate on Latest Models
We are constantly testing our AI detection models against the latest flagship models from OpenAI, Anthropic, Meta and other leading LLM providers. We regularly publish studies on the latest models. Read the latest AI Studies.
Built and Trained on “Adversarial” Datasets
We actively test AI tools that change, modify, or edit text. Once our team identifies a strategy that attempts to hide AI-altered text, we improve our AI detector to ensure it is detectable by our AI detection tool.
Tools to manage False Positives…
With our AI Detection Chrome Extension writers and students can confidently show their writing is their own. It’s peace of mind that your work won’t be incorrectly accused of being AI (and produce a false positive).
Is it AI? Show clients and teachers the behind the scenes process so they can see how a Google Doc was created with sped up character by character/word by word replay.
AI Checker Chrome Extension
Quick scan
Check for AI Content on Any Website Quickly
With our Chrome Extension you can check any webpage you are visiting to see if it is AI written text.
Easy copy paste
Quickly Check Content Using our Copy/Paste Window
Easy-to-use copy and paste text window: check content in Google Docs or any web page in Chrome to check for AI or plagiarism.
Identify Copy Paste
Watch a Writer Write
Peace of mind for writers and students. Watch a writer write the entire document with a sped up behind the scenes look and shareable report.
Features Our Enterprise and Education Customers Love
We understand the unique needs of high-volume web publishers, agencies, schools, and education institutions who need transparency at scale. Don’t risk the negative impacts of Google search traffic dropping or AI writing in student assignments.
Sign up now ›
Team Management
Add, remove and monitor usage of your organization's users. Assign roles as Admin, Manager or User to limit individual ability to access the whole set of features.
AI Checker API
Reliable, Full-Featured, and Fast API Access. See the AI detection API your developers will love.
Your Text is Encrypted
TLS 1.2 or higher is achieved with our end-to-end military grade 256 bit encryption. Your content is secured using industry-standard encryption.
Data Not Used in Training
Optionally opt-in or opt-out of your data being used in future AI training.
A Complete QA/QC Solution
Get a full suite of QA/QC features from plagiarism checking to fact checking and readability. Publish with integrity.
1-Click Delete Scan History
Easily delete all your scan history in 1 click. Keep your scan and Originality reports history organized.
Sentence Level Highlighting
Our AI content detector will highlight sentences indicating the probability of whether or not each sentence was AI written or human written.
Features of our AI Detector for Writers & Students
Our AI detector provides you with the ability to accurately identify AI content, correct accidental AI plagiarism, and share reports to show your writing is Original.
Sign up now ›
Shareable Reports
Easily share the results. Show your text is Original with a shareable link.
Edit
Streamline editing in-app with our fully featured text editor and then scan again.
Export
Easily export text with one-click copy pasting to Google Docs or Microsoft Word for further editing.
Highlighting
See what sections of the text is most likely to be identified as AI-generated.
Scan History
See a complete history of all scans that you can reference in the future as needed.
PDF Report
Download a PDF report showing if the text is Likely AI or Original.
AI Allowance
Choose how much AI you allow with flexible AI detection that adapts to your hybrid-content workflow.
Writers, Editors & Marketers
Teachers & Students
Agencies & Enterprise
Integrations: Extensions & Plugins
Seamlessly integrate our AI Checker into your favorite platforms like Chrome, Moodle and more. Check for AI use without skipping a beat.
Protect your reputation & improve your content quality by accurately detecting plagiarized content and artificially generated text.
See Originality.ai pricing ›
Kityo Martin
CEO & Founder of ClickingPublish.com
At Clicking Publish, producing original, high-quality content is essential to our success. To maintain these standards, it's important that we verify the work from freelancers and outsourced writers. Originality.ai makes this process easy for us by providing a simple and efficient tool that ensures the content we receive meets our expectations.
Sam Saltis
Originality is a great tool for detecting AI content. The product has been invaluable for our content marketing team. Fernanda and the team are always very responsive and helpful. Highly recommend this product.
Miguel Maloney Thompson
I have the opportunity to make sure that my writing is plagiarism-free, and with a lot of AI-generated content around, I can ensure my writing does not get flagged as just another to the bunch.
I do technical writing where there are only so many ways to describe concepts and ideas. However, Originality.ai gives me the opportunity to personalize my writing even more, which is an advantage. With some time, I can give my content a sense of uniqueness.
John Kohn
Reliable and trustworthy. Originality is always so quick to respond to my questions and lend a helping hand. It’s a very good tool for detecting ChatGPT use on academic papers, especially with the "view writing" feature which shows the text being typed by the student as they were typing it.
Stevie Lambert
AI is accurate compared to free choices and the support staff like Ellie are very helpful. The interface is easy to use and shows a % chance of the work being AI. It’s also, nice that it shows what parts may be AI or not.
Aptidus
The service provided is exceptional, offering the most accurate and reliable AI detector available on the market. The customer support team is exceptionally responsive.
Gbas gbos
Originality's AI checker and plagiarism detector are absolutely phenomenal—by far the best I have used (yes, I used all of Winston, GPT zero, etc.). The Turbo model is CRAZY good!
Vivek Pandey
There are lots of similar AI detection tools available online but nothing comes even close to what they offer. I can't trust any other tools other than theirs. Have tried maybe 20-30 other websites and settled with them.
Yanmin Wang
I had an excellent experience with the support team at Originality.ai. They were incredibly responsive and provided clear, detailed answers to all my questions. The explanations were thorough, and I now have a much better understanding of how the platform works and how my content is handled.
The team was patient and professional and went above and beyond to ensure all my concerns were addressed. I truly appreciate their help and the top-notch customer service they provide. Highly recommended!
Canadian Law Student
Originality.ai is the best tool on the market. I have used comparable services and this one is exceptional. It provides an accurate report with a match score which really helps writers/researchers adjust and improve their work.
There are also advanced features such as paraphrase detection which are not available with any other comparable service. The features provided by Originality.ai are exceptional for users who want to avoid plagiarism and also improve their research process. I hope to continue using Originality.ai for many years to come.
John Willsdon
This is a really helpful tool. Certainly the best of the AI detectors I tried. What makes it great is that you also get a bunch of other tools that are really helpful. The fact checker is awesome, it gives you feedback on whether or not points in your essay are factual or not by reading the source material in your citations.
Todd
I have been using this tool since the start! And it has saved me many times. Many times when checking clients' sites the problem was AI content or plagiarism.
Chris Swanson
When I hire writers, I want 100% human-written content. I depend upon Originality.ai to check this for me.
Dirk Berger
Originality.ai saved me from making a big mistake. I have written a book with the help of ChatGPT, 40% of my work is AI; 60% is human. It identified the AI, and now I am writing it all by myself. 88-100% human. Thank you Originality.ai.
Rob McTavish
I started to look for an easy tool to confirm my suspicions over some of the material being submitted by my students in first-year Communication courses. I found Originality.ai and tried it out. It worked so well that I actually tested it out with some material I created using AI as an example and sure enough, it perfectly determined which was my work, what was totally AI-written, and what was edited AI material.
Andrew Stevenson
Originality.ai has been remarkable in its ability to detect AI content. The customer service is also incredible in how thorough and responsive they are. Highly recommend this program.
Pieter Steenkamp
I found Originality.ai to be the best AI detector. I use it for my student's assignments and recommend it to my colleagues.
JC Playz
Originality really lives up to the expectations, it's super reliable and has the best detector for AI. Now I can understand why so many people use it such as professionals.
Trish McLean
Incredible experience. Excellent product. Very easy to use, thorough and informative. Brady was incredibly helpful on the chat. He carefully checked my document to see why it had a high score for AI and then explained it to me. He provided individualized advice on how to move forward. Excellent! Thank you Brady.
Joseph Bereber
Customer service is top-notch. Not only are they super accommodating, they are also super helpful. The tools on Originality.ai are also incredibly accurate and very useful. I've had nothing but positive experiences using this service.
Peter Stuart
Originality.ai is by far the best AI detector tool. We have used other tools to detect AI in content but we have found that Originality.ai is by far the most accurate. This, combined with flexible payment plans to suit individual requirements and sharp customer support. Originality.ai is a no-brainer if you are looking for an AI detection solution.
Trusted AI Detector by Industry Leaders
Jennifer Korn
How companies are embracing generative AI for employees…or not
Many prominent companies have entirely blocked internal ChatGPT use, including JPMorgan Chase, Northrup Grumman, Apple, Verizon, Spotify and Accenture, according to AI content detector Originality.AI, with several citing privacy and security concerns.
Ben Schreckinger
AI vs. public opinion
Originality.ai, a site that provides detection services for AI-generated content and plagiarism, published a convenient tracker that lists the 10 pending lawsuits against OpenAI and ChatGPT.
Betsy Reed
Mushroom pickers urged to avoid foraging books on Amazon that appear to be written by AI
Four samples from the books were examined for the Guardian by Originality.ai, a US firm that detects AI content.
Steven Lee Myers & Tiffany Hsu
Another Side of the A.I. Boom: Detecting What A.I. Makes
More than a dozen companies have popped up to offer services aimed at identifying whether photos, text and videos are made by humans or machines.
Generative AI: hype not hyperintelligence is lifting values
Generative artificial intelligence could produce magic in the sky, says Sam Altman founder of pioneering start-up OpenAI. Successful entrepreneurs are entitled to make visionary statements.
Sara Fischer
Major websites are blocking AI crawlers from accessing their content
Nearly 20% of the top 1000 websites in the world are blocking crawler bots that gather web data for AI services, according to new data from Originality.AI, an AI content detector.
Andrea Taloni, Vincenzo Scorcia, and Giuseppe Giannaccare
Modern threats in academia: evaluating plagiarism and artificial intelligence detection scores of ChatGPT
Plagiarism and research integrity are sensitive issues in the academic setting, especially after the recent offspring of artificial intelligence (AI) and large language models (LLMs) such as GPT-4.0 [1].
Sara Guaglione
Why publishers are questioning the effectiveness of blocking AI web crawlers
A number of publishers — including Bloomberg and The New York Times — were quick to block OpenAI’s web crawler from accessing their sites, to protect their content from getting scraped and used to feed the artificial intelligence tech company’s large language models (LLMs).
Is There an Originality.ai Free Trial?
Is Originality.ai free, or is there a free Originality trial? While we don’t offer a free trial of Originality.ai, as an alternative, we offer a free AI content detection tool (a limited free version of our AI Checker) on this page. Have a question? Reach our exceptional support team here.
Does Originality.ai Provide Paraphrase Detection?
Yes, Originality.ai offers an AI detector for identifying AI paraphrased content from tools like Quillbot. Plus, now with AI Allowance, you can flexibly select how much AI paraphrasing you allow from 0 to 40% (see our accuracy study for more insights).
What AI Checker Do Colleges Use?
We’ve seen the question pop up a few times: “Can colleges tell if you use AI?” Originality.ai is used by many colleges and universities. Learn more about which AI checkers colleges use to check if writing is AI.
What Can Cause False Positives?
False positives in AI detection do occur, and rates can vary widely by AI detection tool and brand. Remember to check accuracy rate as well as false positive rates.
Tips to reduce false positives:
Review AI confidence scores (classic model) produce a percentage of confidence that your content is Likely AI or Likely Original. Example: An AI detection score of 60% Likely Original and 40% Likely AI is not a false positive. It correctly predicted with 60% confidence that your content was Likely Original.
Align your AI Allowance scans (new) with assignment or project guidelines to flexibly adjust how much AI you allow. This is ideal for hybrid human/AI writing scenarios.
Be mindful of tools that use AI to rewrite or edit copy (e.g. some Grammarly features).
Typically, the shorter the text, the less accurate the detection score; we have a 100 word-minimum at Originality.ai
Have a question? Our exceptional support team is here to help.
What Do You Do if You Have Been Falsely Accused of Using AI?
See our in-depth guide on avoiding and managing false positives (when human-written content is identified as AI-written text by an AI detector). AI detection isn’t the same as plagiarism checking and should have a more nuanced approach.
Students: Share AI detection accuracy studies with your teacher, then show your writing process with our Chrome Extension. An AI detection score alone should not be used for academic integrity discipline.
Writers: Get peace of mind and prove your writing is yours with our Chrome Extension.
Agencies: First, clearly communicate with writers (and clients) if AI is acceptable or not. If it is acceptable, describe how much. Then, use AI Allowance to flexibly choose how much AI you allow.
If you have clients who accuse your agency of producing AI content rather than human, refer to your company's policy/procedure for checking work and show the scan history of the writer's work.
What AI Checker Do Colleges Use?
We’ve seen the question pop up a few times: “Can colleges tell if you use AI?” Originality.ai is used by many colleges and universities. Learn more about which AI checkers colleges use to check if writing is AI.
How Accurate Is the Originality.ai AI Content Detection Tool?
Are you wondering, “Which AI detector is most accurate?” On the latest AI models, Originality.ai has 99% accuracy. To see accuracy rates on our latest AI detection models, please visit our Accuracy Study.
Then, read a meta-analysis of 3rd-party studies, get insight into what false positives are (and how to avoid them).
What Is AI-Generated Text?
AI-generated text is text that is written by artificial intelligence (AI), specifically using Large Language Models (LLMs).
The most common example is OpenAI’s ChatGPT (e.g. GPT-5.5) which uses NLP (natural language processing) to understand a user's prompt and provide a written response.
Use AI Allowance to select how much AI you allow when checking for AI text in content, blogs, essays, or papers.
Can I See Previous Scans?
Yes, after you run an Originality report, all scans are stored for later retrieval or sharing. Complete removal of your account and data is available upon request.
What Languages Does the AI Detector Work For?
Is it written by AI? Now, with Originality.ai, you can check if text is written by AI, with world-class AI detection in 30 languages and an overall accuracy of 97.8% for our multilingual model. Read our Multilingual AI Detection Accuracy Study.
Can Google Detect and Penalize AI Content?
Google, along with other search engines, has made it clear that “Using automation—including AI—to generate content with the primary purpose of manipulating ranking in search results is a violation of our spam policies.” - Google (2023)
We completed a correlation study (see study image below) and identified a small correlation between the Originality.ai score and Google search result ranking. Potentially indicating that AI content performs worse in Google than Original content.
Additionally, we found that Google Adsense can identify AI-generated text and rejected a website because of AI-generated text, and the March 5th 2024 Google Update targeted AI Spam sites.
Do Credits Expire?
Yes, per our Terms and Conditions, credits expire 2 years from the date of purchase.
Does Originality.ai Have a Plagiarism Checking and AI Detection API?
Yes, Originality.ai offers a robust API. Our API has been integrated into content operations platforms for some of the largest publishers/writing agencies and marketplaces in the world. It’s designed so you can streamline checks for AI plagiarism and detect AI-written content at scale.
Full documentation is in the backend. Have a unique use case? Wondering about the API’s capabilities to handle your volume? Please reach out, we’re happy to discuss your needs.
What Do AI Detection Scores Mean?
An AI detection score is a prediction on whether the submitted text is AI-generated or Original (human-written), it provides a probability that content is (or is not) Likely AI. At Originality.ai, we emphasize that AI scores reflect just that — probability — not guilt.
We recommend not applying a similar “hard” rule when it comes to working with AI scores and writers or AI detection in education. If a writer or student consistently has high Originality scores but then one article has a higher AI score, this could be a false positive and further investigation should occur.
If you select AI Allowance, you choose how much AI you allow in your scan. So, your AI score will reflect whether the percentage of AI writing is likely more or less than your selection for that scan.
AI & Plagiarism Detector for Serious Content Publishers
Originality.ai
64 Hurontario St
Collingwood, Ontario
L9Y 2L6
