AI Powered Plagiarism Checker for The World’s Leading Businesses and Educational Institutions

Through the power of AI, detect any instances of similar and plagiarized text in school work, business documents, websites, and more with Copyleaks.

Compare content from internal documents, student work, and website pages against billions of pages on the internet, open databases and journals, and more to find the most relevant results and evidence of plagiarism. Receive a full report with a side-by-side comparison of each similar text passage.

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Organizations from around the World Trust Copyleaks as Their Plagiarism Checker

Why Copyleaks Plagiarism Checker?


AI & Machine Learning

Powerful AI allows Copyleaks to analyze text that has been manipulated and detect identical, similar, and paraphrased versions of text. What other online plagiarism checkers let slip through the cracks is exactly what we’ll find.

Accurate Similarity Reports

Receive comprehensive and accurate results in the form of a PDF report. See a full breakdown of similar word matches, side-by-side text passages, a similarity percentage and more in any language.

Integrate with Your Platform

Integrate the power of Copyleaks with your environment. Enhance your platform with the Copyleaks API or choose from one of our current LMS integrations for your school.

Detect Plagiarism In Seconds with Copyleaks

Paste or upload your text/document and get started today for free with a 20 pages/month limited trial!

Plagiarism sucks. Our advanced, user-friendly plagiarism checker will help you check for plagiarism and spot unauthorized content and give you tools to eliminate it before it’s too late. With our extensive database of hundreds of millions of unique papers, you can rest assured that your work is original. Our plagiarism checker tool operates in several easy steps and will return the results within seconds!

Scan your text for a quick plagiarism scan now and experience why our plagiarism checker is trusted by writers, students, businesses and bloggers to ensure original work!

Copyleaks Plagiarism Checker is an advanced and comprehensive solution that helps teachers, students, SEO writers, publishers, bloggers, and anyone creating original content online, check for plagiarism, and duplicate content. Our platform can be integrated with your website with our API or can be used as a stand-alone solution on your web browser. With Copyleaks, identifying plagiarism and confirming text originality is easy.

See What Our Customers Are saying about Us

Stephen Roe

Head of Digital Strategy

Copyleaks showed me plagiarism from my team that Grammarly and Copyscape missed. We’re on contract with clients to provide original content, and Copyleaks helped me see the tools I trusted with my livelihood.

Al Globus

Editor-in-Chief, National Space Society

Award Force chose the Copyleaks API as a plagiarism checker for their contest software. We held a contest, and it only took four days to handle the problems exposed by over 2,700 entries from 13,000 participants. Copyleaks’ support for this effort was outstanding. We were able to use plagiarism detection effectively, and it played a major role in our success.

Fleur Blanford

Head of International Studies

The Copyleaks support and API service has been gratefully received. We have an incredibly complex system with multiple variables when student assignments are submitted through our platform. We always receive fast and accurate results and timely assistance when needed.

See What Makes Copyleaks Plagiarism Checker So Powerful

Our online plagiarism checker offers advanced solutions that help you confirm the original content you’ve worked so hard to create is plagiarism free. Copyleaks technology allows you to seamlessly and securely upload your content and receive the most accurate results.
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AI-Powered Technology

Copyleaks uses advanced AI and Machine Learning technology that can find even the slightest change as well as identical and paraphrased text.
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Get an alert when suspected cheating has been found using “Character Replacement” and “White Ink” methods that would go undetected by other plagiarism checkers.
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Compare two different websites, including all individual webpages against one another to find possible copyright infringement.
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Powerful API and LMS Integrations

Integrate your Learning Management Systems with Copyleaks in under 30 minutes! Use Copyleaks API to go further and create advanced integrations.
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Compare Multiple File Formats

Upload and compare text files of all kinds including Doc, Docx, PDF, XLS, PPT, and image files with text using our advanced OCR technology.
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Download and Share Similarity Reports

Share the similarity reports for each comparison with others through email, URL, and download it as a PDF report.

Duplicate File Finder Tool

Reduce your computer’s storage capacity and free up memory space by locating and removing identical files within your system.

Multi-Language Capability

Copyleaks can detect plagiarism in over 100 languages, including Asian character languages.

Multi-layered and Extensive Search Capabilities

Our search capabilities extend past simple identical text matches. You can filter your plagiarism searches according to what you’re looking for, and receive a customized report each time.

Accurate Reports

We break down the similar results for you.All similar matches, statistics, suspected sources, and similarity percentages can be found in easy and comprehensive reports.

Store Private Documents

Repositories allow you to compare documents against data that only your team will have access to and creates and even more comprehensive comparison.

AI Grading Tool

Receive a grade for thousands of written exams and open-ended essays with our automatic grading tool. Save endless hours while scoring essays accurately.


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

Comprehensive Comparisons

Compare documents against one other, billions of sources from the internet, open access journals, and the Copyleaks Internal Database for the most accurate results.

Work as a Team

Invite colleagues, students, teachers, and different department members to have access to the Copyleaks Platform with our Teams feature.

Plagiarism Checker Key Hightlights:

Use the Copyleaks Plagiarism API and Multiply the Capabilities of the Copyleaks Plagiarism Checker.
100% Private. Flexible. Scalable. Reliable.

Who Does Copyleaks Plagiarism Scanner Cater To?

Everyone from teachers to writers to content creators can benefit from checking for plagiarism. It’s easy to compare plagiarized content and avoid copyright infringement when you use Copyleaks.

Copyleaks detects plagiarism, even if it is unintentional plagiarism, and provides an exhaustive report that shows the similar text, the similarity percentage, and also allows you to compare your text against other sources, to avoid duplicating content. We compare your document side-by-side to billions of web pages online. Copyleaks will let you know which sentences in your text you should be proud of, and which sentences you should delete or rewrite to avoid looking like a copycat. Once you have all the results, you are able to download detailed reports with accurate results and share them with students or other colleagues. You can see the source of multiple pieces of text, and filter the sources according to your needs. Copyleaks online plagiarism checker helps you be sure that your content is completely original.

Academia & Educational Institutions

School Teachers & Faculty: It is the responsibility of school teachers and faculty to check that their students have submitted original and authentic school work. Copyleaks makes teachers’ jobs easier by helping them determine if students have copied from online sources, a fellow student, or simply forgot to include references in their assignment. We make it easy for teachers to find plagiarism through our website and our LMS integrations including Moodle, Blackboard, Canvas, and Brightspace. Teachers can also easily organize the student assignments they have scanned by creating folders for each class.

Universities, Colleges, & PG: Universities and colleges work with Copyleaks to promote the idea of academic integrity and help students understand the importance of creating original work. By using the Copyleaks plagiarism detection platform, all levels of the university are able to check their own work and adhere to writing original and plagiarism-free essays. Students are able to check their own work to confirm that they have included all necessary references and quotations, making them less susceptible to accidental plagiarism.

Students: High school and college students should always create original work for their school assignments. Writing a plagiarism-free essay means that they have checked their references, correctly quoted all borrowed sentences, and submitted their work for a plagiarism scan. Copyleaks is great for students who are looking to double-check their work, and know with certainty that they have created the most authentic work and will not be caught plagiarizing, even if it is accidental plagiarism.

Qualification Assessments & Written Exams: Checking for plagiarized content in qualification assessments is easy with Copyleaks. When using a plagiarism checker for written exams, it is important to know that the scan will be comprehensive, accurate, and fast. Teachers and proctors want to know that the work is being checked in a way that identifies any suspected plagiarism so they can give the assignment the most accurate grade. Checking written exams in the most comprehensive way is easy with Copyleaks content similarity detection.

Learning Management Systems: Checking for plagiarism with a learning management system is now seamless with Copyleaks LTI integrations. PG working with Moodle, Canvas, Blackboard, and Brightspace now have the ability to check students’ work from within the LMS platform and conduct a plagiarism scan when the assignment is due. Students can submit their assignments and receive a grade and plagiarism score side by side, making it easier for teachers to focus on other work. Copyleaks LTI integrations are easy to set up so plagiarism checking can be done with just one quick scan.

Enterprises and Small Businesses

Publishers & Online Media: For publishers and those working in online media, it is crucial to keep track of where your content is being published. Copyleaks can let you know if your online content contains copyright infringement, which is useful if you are publishing large quantities of content daily and routinely. With automatic scans, it’s easy to uncover if a smaller website stole your content that you worked so hard on. Using Copyleaks plagiarism checker will keep your published content safe from plagiarism.

Law Firms & Legal: Law firms have to be responsible for checking that their own work or client documents are being used properly. Many lawyers must check the similarities between two documents and instead of going line by line, Copyleaks comparison tool can find the differences automatically. It is important to also check for evidence of copyright infringement and with Copyleaks similarity checker, you will receive a comprehensive report of all similar text. Check that your documents are plagiarism-free with Copyleaks.

Websites: Before you launch your new website or upload any new content, it’s important to be sure that all content created is plagiarism-free. Copyleaks plagiarism checker can scan the text throughout your website and give you a full report with similar sources so you can see if there is any accidental plagiarism or duplicate content. After your website content has been published, you can always scan the internet to make sure no one has stolen passages of the text without your consent.

Bloggers & Writers: For bloggers and writers who are always creating new content, it’s important that the safety of your original work is a top priority. Copyleaks helps you check that once your content is published online, you can find out if others have stolen your content without permission. You can routinely do a full scan and receive comprehensive results about where else your work has been used. With the Copyleaks plagiarism checker, you will never have to worry about duplicate content hurting your hard work.

Check for Plagiarism using Tools & Addons


Plagiarism Detection API


LTI Integrations


File Comparison Tool


Website Comparison




Programming Code Checker

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 ready to be scanned, you can compare your text against billions of online sources, and Copyleaks’ internal database, to ensure that it is 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 detector will seamlessly check for plagiarism within content, even if it is unintentional, and will display a fully comprehensive report. This will show the identified similar text, 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 have done so, you can download the report containing accurate results and share them with students or other colleagues. Our plagiarism checker online helps you be sure that content is completely 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 Detector

A plagiarism detector gives the final approval that your content or student’s work is completely 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, it is crucial to check for plagiarism against multiple online sources. This way, you will have 100% certainty that the text has not been stolen. Using a plagiarism detector is as common as checking for spelling errors, and with Copyleaks, we do the hard work for you by showing you how to check plagiarism if you have never done so before. 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. 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 accidentally forget to include references. That’s why it’s so important to check for plagiarism in your paper before it is seen by anyone else. Copyleaks is even able to be used as a code plagiarism checker for computer science classes too. Try Copyleaks today, so you’re not accidentally caught with work that isn’t yours. Want to know more about how to check plagiarism in your work? Please get in touch with the team today about our automated online copy checker for further information.

Plagiarism Resources

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What is Plagiarism

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How to fight Copyright Infringment

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Fight Educational Plagiarism

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Plagiarism Spectrum

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Why is Plagiarism Important?

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How to Avoid Plagiarism?

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How Does Plaiarism Checkr Work

Frequently Asked Questions (FAQ)

Plagiarism is a punishable offense. Plagiarized assignments can be canceled, or lower grades can be given. We make scanning your work easy. Simply input your document into our scanner and we will handle the rest.
Teachers employ Copyleaks’ plagiarism checker for PG to scan students’ assignments for copy and paste issues.
Copyleaks plagiarism scanner is used by professors for checking academic assignments. Our services are available with competitive pricing and provide extensive checks on all written work.
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.
Here at Copyleaks, we provide both AI and Machine Learning Technology as part of the plagiarism scanner to detect paraphrased content within your work.
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.

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