Plagiarism Checker

Each day the world’s largest businesses and educational institutes—along with millions of students—trust our exclusive AI-powered text analysis to identify potential plagiarism and paraphrasing across nearly every language, detect AI generated content, verify ownership, and empower error-free writing.

Trusted by leading organizations and institutions:
UC San Diego
The Soul Publishing
Oakland University
University of Edinburgh
Ohio Business College

Plagiarism Has Evolved, So Should Your Detection

Check for plagiarism using advanced AI to detect the slightest variations within the text, including hidden and manipulated characters, paraphrasing, and AI-generated content.

Take it beyond word-for-word plagiarism detection with the only platform that:

Copyleaks sample Plagiarism and AI content report

What You're Getting

Retain Transparency Around Your Training Data

AI-Generated Content Detection

The most comprehensive and accurate AI content detector with 99.1% accuracy, full model coverage including GPT-4 and Gemini, detection in multiple languages, and the ability to detect paraphrased AI-generated content.

Scheduled Recurring Scans

Scheduled Recurring Scans

New content is being created at an unprecedented rate. Stay on top of how yours is being used with recurring scans that automatically keep your content safe from potentially plagiarized or unlawful duplication, adding a new layer of protection for your content.

Source Code

Source Code Plagiarism Detection

Compare source code files against one another and the internet to see if the code is original. 

Powerful API and LMS Integrations

Integrate your Learning Management Systems with Copyleaks in minutes! Or use Copyleaks API to go further and create advanced integrations.

LMS report

Unparalleled Search

Easily detect different levels of content duplication and multiple forms of paraphrasing with trillions of pages of original content at your fingertips, along with:

  • 16,000+ open-access journals
  • 60 trillion websites
  • 1M+ internal documents
  • 20+ code data repositories
Source examples

Plagiarism Detection in Over 100 Languages

With one of the most extensive language databases available, you’ll have the ability to scan and detect potential plagiarism in over 100 human languages.

Multiple Languages
Copyleaks sample Plagiarism and AI content report

A Reporting Experience Like No Other​

Every scan gives you a clear, comprehensive, interactive similarity report. Plus, you can download and even choose to share the findings report. It’s all up to you.

Build Your Team​

Invite individual members or an entire department from your organization, set up unique scan profiles, view and share Similarity Reports, and more.

Grant Full Access ​

Collaborate without being limited. Invite colleagues, clients, or classmates and share all of Copyleaks’ capabilities with them under one secure account.

Military-Grade Security

A cloud-based system architecture, military-grade 256-bit encryption with SSL connection, and 100% HTTPS data transferring ensure your complete safety and security. Plus, we are GDPR-compliant and the only SOC 2 and SOC 3 certified platform.

How Does Copyleaks Plagiarism Checker Work?

The Copyleaks plagiarism checker can detect all types of plagiarism using artificial intelligence technology. Once you have created an account, it’s easy to upload your document and use the tool to check for plagiarism. Once your document is scanned, you can compare your text against billions of online sources and Copyleaks’ internal database to ensure plagiarism-free. 


This process only takes a few seconds to complete, making it a fast plagiarism tool to use whenever you need it. Copyleaks’ plagiarism checker will seamlessly check for plagiarism within content, even if unintentional, and display a fully comprehensive report. This will show the identified similar text and the similarity percentage and even allows you to compare your text against any other sources with its copy checker feature. You can also see three layers of text similarity and filter the sources according to your needs. 


Once you do so, you can download the report containing accurate results and share them with students or colleagues. Our plagiarism checker online helps you be sure that content is entirely original, providing you with a simple-to-use plagiarism tool that will always detect issues before they become a bigger problem, allowing you to act fast.

Importance of a Reliable Plagiarism Checker

A plagiarism checker gives the final approval that your content or student’s work is entirely original. This is incredibly important in today’s society, where many people may forget to check for plagiarism when writing essays or producing online content. Whether the content will be read by two or two million people, checking for plagiarism against multiple online sources is crucial. This way, you will have 100% certainty that the text has not been stolen. 

Using a plagiarism checker is as common as checking for spelling errors, and with Copyleaks, we do the hard work for you by showing you how to check for plagiarism if you have never done so. All you have to do is upload the text, and within seconds, you can have a fully comprehensive report of your submitted copy.

Why Use a Plagiarism Scanner?

Using a plagiarism checker online is common practice in today’s digital world. So whether you’re a teacher who needs an essay or thesis checker, a writing agency who needs an SEO plagiarism checker, or a lawyer who wants to use a plagiarism scanner to compare files online, we have created our plagiarism checker online with you in mind. 

After working so hard on an assignment, it’s easy to forget to include references accidentally. That’s why it’s so important to check for plagiarism in your paper before it is seen by anyone else. Copyleaks can even be a code plagiarism checker for computer science classes. 

Try Copyleaks today, so you’re not accidentally caught up with work that isn’t yours. Want to know more about how to check plagiarism in your work? 

Find out what's in your copy.

Get started with Copyleaks for free today!

Frequently Asked Questions

You can integrate our plagiarism checker API directly into your application or website. All you have to do is to sign up for the API key and then log into the API. Once done, create a process using any of the four ways; get the status of the process you used and the results of the scan. The result is a detailed comparison report, with similar content and related statistics.

Similarly, you can integrate our API with your internal database, Learning Management System (LMS), online learning platform, writing tools, and SEO authoring tools for plagiarism detection.

Of course, any plagiarism tool can miss small elements. However, we work hard at Copyleaks to make sure that we provide an extensive plagiarism checker that checks your work to ensure 100% authenticity.

With Copyleaks, we use the very best of AI, Machine learning, Multi-Language capability, and Multi-Layered and extensive search capabilities to provide you with the most accurate plagiarism results.

Though you are inputting your work into a plagiarism checker, it is important to note that we will never steal your work. We will check your work for plagiarism and will allow you to download a report based on our checks.

Our AI Content Detector is the only platform that can detect multiple languages including English, Spanish, German, French, and Portuguese, with more languages to be introduced shortly. English accuracy is over 99%, and the accuracy of other languages is not far behind and getting more accurate daily.

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