Most Accurate Plagiarism Checker

A modern, patented, Al-powered plagiarism checker that is more accurate than Grammarly & Copyscape.

Check out the world’s most accurate AI Detector

Get your content checked for any AI-generated or rewritten content.

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Trusted by Industry Leaders

Harvard UniversityThe GuardianThe New York TimesFlippaMotion InvestSurferDotdash meredithGDDiggity MarketingWriteraccessGMAlibaba.comWalmartAT&TAAReutersBusiness InsiderNeil Patel

Advanced, Comprehensive, and Precise

The Most Accurate Plagiarism Checker

Best plagiarism checker for complex types of plagiarism

Comprehensive Plagiarism Reports with In-Depth Insights

Quickly & efficiently verify any type of plagiarism with our reliable tool. The Originality.ai advanced plagiarism checker excels at detecting complex forms of plagiarism, such as global, paraphrase, patchwork, unintentional, and mosaic plagiarism.

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The most reliable plagiarism checker tool

Streamline your editorial process. Review content for plagiarism before you publish with the industry-leading and most accurate plagiarism checker. Then, sign up to combine plagiarism checking with AI detection.

Surpasses competitors at a 5% threshold*:

Using advanced machine learning the Originality.ai plagiarism checker can:

  • Identify global plagiarism with 99.5% accuracy.
A superior edge over Copyscape at 68.5% accuracy.
  • Detect patchwork plagiarism with 67.5% accuracy.
Most accurate of all checkers tested.
Comparative Accuracy: Copyscape 30% vs. Grammarly 51% vs. Turnitin 52%

*Note: A 5% threshold refers to when 5% or more of the copy matches other sources. Accuracy percentages are approximate and rounded to the nearest whole number.

Read more on Accuracy   ›

Our unfair advantage

Detect Patchwork & Paraphrase Plagiarism

Traditional free plagiarism scanners can’t spot subtle plagiarism like patchwork or paraphrasing — but Originality.ai can.

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Large AI Models

Maintain Content Credibility

Maintain content integrity and spot issues before publishing or submitting an assignment.

Large AI Models

User-Friendly Interface

Identify plagiarized content in seconds with our user-centered design. Built for ease of use and accessibility on any device.

Large AI Models

Scans everything in seconds

Our plagiarism checker quickly highlights matches. Check blogs, papers, assignments, and more with robust plagiarism detection.

Modern Plagiarism Detection

Hybrid Plagiarism Checks: Web-Based & Academic or Journal Databases

Confidently scan writing with hybrid-plagiarism detection that’s flexible to your use case.

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Shareable Reports

Web App Users

Scan publicly available web content through Google search.

Edit

LMS and Institutional Integrations

Extend detection to include academic journal databases and a private data repository. Enable checks for internal papers, student submissions, and institutional archives.

Export

Data Privacy & Security

Our hybrid plagiarism detector keeps data secure and private.

Features of our Plagiarism Checker

A guide towards original
and authentic expression

Our comprehensive suite of tools provides support for Editors, Marketers, Students, Educators and Web Publishers.

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Highlighting

Sentence Highlighting

See what sections of the text is plagiarized, and to what extent.

Edit

Export & Share Reports

Prove that your writing is authentic, maintain academic integrity, or journalistic ethics with a shareable plagiarism report.

Edit

Edit

Streamline editing in-app with our fully featured text editor and then scan again.

Highlighting

Paraphrasing Detection

Advanced machine learning algorithms highlight even subtle instances of plagiarism like patchwork plagiarism, paraphrasing, and more.

Scan History

Scan History

See a complete history of all scans that you can reference in the future as needed.

PDF Report

PDF Report

Download a report showing the most plagiarized sources and the number of matched phrases.

PDF Report

Up-to-date

Always a step ahead of new developments in AI, machine learning and NLP.

PDF Report

Multi-language capabilities

Scan non-English text and check for Plagiarism in Google search results for greater certainty of originality across other languages.

Originality.ai is Built For…

Marketers, Writers & Publishers 

Marketers, Writers & Publishers 

Teachers & Students

Teachers & Students

  • Uphold integrity and transparency across: assignments, essays, coursework, papers
  • Moodle Plugin: easily check for AI content and plagiarism in Moodle LMS
  • Peace of mind for students with a Free Chrome Extension to ‘Watch a Writer Write’
Agencies & Enterprise

Agencies & Enterprise

  • Manage client & writer expectations for AI use
  • Integrate a process for AI detection, plagiarism checking, and factual accuracy at scale
  • Streamline editorial processes across teams with team management and report sharing

How to use Originality.ai

Paste or Upload Text

Step 1

Paste or Upload Text

Login to Originality.ai and paste your text into the editor. You may also upload a PDF or enter a URL for scanning.

Select Scan Types

Step 2

Select Scan Types

Select your desired scan types like AI, Plagiarism, Content Optimization, Readability, Grammar OR Fact checker to scan your text against.

Click Scan

Step 3

Click Scan

Click on the Scan button and get scores for each scan types with detailed explanations and sentence highlights wherever applicable.

Customers love Originality.ai

Sam Saltis

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

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

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

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

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

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

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

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

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

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

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

Chris Swanson

When I hire writers, I want 100% human-written content. I depend upon Originality.ai to check this for me.

Dirk Berger

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

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

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

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

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

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

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

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.

In the Press

Featured by Leading Publications

Harvard UniversityThe GuardianThe New York TimesFlippaMotion InvestSurferDotdash meredithGDDiggity MarketingWriteraccessGMAlibaba.comWalmartAT&TAAReutersBusiness InsiderNeil Patel
CNN

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.

Read the story ›
Politico

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.

Read the story ›
The Guardian

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.

Read the story ›
The New York times

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.

Read the story ›
Financial Times

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.

Read the story ›
Axios

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.

Read the story ›
Nature

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].

Read the story ›
Digiday

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).

Read the story ›

Frequently Asked Questions

What is the best plagiarism checker?

Are you wondering, ‘What is the most accurate plagiarism checker?’ — Originality.ai offers the best plagiarism checker with up to 99.5% accuracy in identifying global plagiarism, 41% accuracy in detecting paraphrase plagiarism, and up to 67.5% accuracy in detecting patchwork plagiarism.

Originality.ai is the most accurate of all plagiarism checkers tested. For a complete analysis of comparative accuracy to competitors, visit our Plagiarism Accuracy Study (as a quick snapshot of comparative accuracy for patchwork plagiarism: Copyscape 30% vs. Grammarly 51% vs. Turnitin 52%).

Is the Originality.ai plagiarism detector suitable for students and teachers?

The Originality.ai plagiarism detector is an excellent choice for educators, teachers, and academic institutions. At Originality.ai, we offer a dual, hybrid approach to plagiarism checks that provides context-specific detection for individuals and educational institutions.

Why is Originality.ai an excellent choice for teachers?

  1. Advanced Moodle LMS Plugin integration: check for plagiarism and AI writing directly in the Moodle LMS.
  2. Academic journal and publication database integrations for more comprehensive plagiarism detection for LMS.
  3. Private Data Repositories for Institutions and LMS platforms, allowing schools and universities to securely scan against their own internal papers and student submissions.

It’s also important to note that a plagiarism checker report should not be used as the only measure to identify academic cheating.

How does the Originality.ai Plagiarism Checker work?

We’ve upgraded our best-in-class plagiarism checker to offer hybrid plagiarism detection.

Discover a plagiarism checker that adapts seamlessly to your use case:

  1. For web app users: The plagiarism checker scans publicly available web content through Google search to identify potential matches and instances of copied or paraphrased text.
  2. For LMS and institutional integrations: The system extends detection capabilities to include academic journal databases and a private data repository, enabling plagiarism checks against internal papers, student submissions, and institutional archives.

This dual approach ensures that both individual users and institutions get accurate, context-specific plagiarism detection while maintaining full data privacy and security.

Does Originality.ai offer an AI plagiarism checker?

With the rise of AI content in Google, combining plagiarism and AI detection is becoming increasingly important. Complement plagiarism detection with the Originality.ai AI Detector to find instances of AI-generated text plagiarism.

Sign up to try the best plagiarism checker for AI and complex types of plagiarism today! Then, learn about the efficacy of plagiarism detection in our Plagiarism Checker Accuracy Study and AI detectors in our AI Detector Accuracy Review and a Meta-Analysis of Third-Party AI Detection Studies.

Are plagiarism detectors beneficial for marketers?

Originality.ai is the most reliable plagiarism detector for content marketers, digital marketers, and web publishers. Identify potential instances of plagiarism in content so you can publish with confidence.