Plagiarism Checker
Ensure the originality of your content and prevent copyright infringement with the award-winning Plagiarism Checker from Copyleaks, a free, online tool to detect content plagiarism.
Avoid plagiarism & maintain originality with the award-winning Plagiarism Checker.
Copyleaks Plagiarism Checker is the market-leading online tool for detecting duplicate content, paraphrasing, source code infringement, and more.
Detect All Forms of Plagiarized Content
Copyleaks’ plagiarism checker ensures originality by detecting paraphrasing, image-based plagiarism, character manipulation, and even LLM-generated text.
A High-Quality Plagiarism Detection Report, Your Way
Choose the insights you want to see and how you want them reported.
Every plagiarism detection scan provides a detailed report, including web page links where potential findings are sourced from, generative AI, and more that can be customized, downloaded, and shared.
Check for Plagiarism Google Docs Add-On
Scan for plagiarism directly in your Google Docs document, with real-time insights to keep your writing original and authentic.
Content Originality Matters
A plagiarism checker gives the final approval that your content is entirely original. Using a plagiarism checker is as common as checking for spelling errors, and with Copyleaks, it’s even easier.
An Unparalleled Search For Your Most In-Depth Results
Search across an unparalleled database of resources for every plagiarism scan, including:
- 16,000+ open-access journals
- 60 trillion websites and search engines.
- 1M+ internal documents
- 20+ code data repositories
Elevate your originality with the Copyleaks Plagiarism Checker.
Plagiarism Checker Features
Enhanced Plagiarism Checker
Detect advanced plagiarism, paraphrasing, and more with over 99% accuracy*. Powered by a comprehensive database that includes millions of assignments and real time web indexing.
Cross-Language Plagiarism Detection
Scan a document in Spanish and find potential duplicate content matches in Chinese, German, Portuguese, and more. Over 30+ languages supported.
Source Code Plagiarism Detection
Identify AI-generated code, code plagiarism, modified code, and licensing alerts. With one robust solution, avoid potential infringement.
Scheduled Recurring Scans
Whether you are a content creator or writing a research paper or academic paper, scheduled recurring scans add an extra layer of protection, automatically protecting your original work from potential plagiarism or unlawful duplication.
Plagiarism Checker Supports Over 100 Languages
Detection for potential plagiarism in over 100 world languages, including German, Russian, Spanish, English, and more.
Military-Grade Security
Have full confidence in military-grade security, GDPR compliance, and SOC 2 and SOC 3 certifications, see full security details.
Plagiarism Checker Integrations
Plagiarism Check For Enterprises
Bring the power of the Copyleaks Plagiarism Checker to your native platform with seamless, fully white-labeled API integration.
Plagiarism Solutions For Educational Institutions
Simple LMS integration empowers learning and error-free writing while keeping everything you need in one convenient place.
Oakland University Plagiarism Checker Case Study
Learn how Oakland University adopted Copyleaks and changed the conversation around AI and plagiarism among their faculty and staff.
Campaign KPIs
Ease of use & Integration, Cost-effectiveness, Customer Support, Security
Leaders in Content Authenticity
We’re dedicated to innovation and continuous improvement, providing you with the tools needed to maintain content and academic integrity, search engine optimization, copyright compliance, risk mitigation, and more in a changing landscape. Our award-winning, industry-leading plagiarism checker ensures accurate results, keeping you ahead of the latest technologies, including genAI.
Plagiarism Checker Testimonials
Copyleaks' tools give us an opportunity to help teachers save precious time that they can utilize to provide more personalized instruction to students while helping them understand the importance of academic integrity.
Kinsey Rawe, SVP & GM, Courseware & Instructional Services for Imagine Learning
Plagiarism Checker is even better when paired.
A comprehensive, all-in-one platform designed to ensure complete content integrity and transparency.
Get started with the award-winning Plagiarism Checker today.
Plagiarism Checker FAQs
You can try our online plagiarism checker free by registering for a Copyleaks account here.
Copyleaks can scan more than 100 languages, including English, Spanish, French, Portuguese, Arabic, Russian, German, Greek, Chinese, and Japanese.
Please note that scans will only be done in the same language you have submitted. For example, if you submit a scan in Spanish, Copyleaks will only search for results in Spanish.
hat are the different types of text similarity for the Plagiarism Checker?
Our plagiarism scans offer three layers of text similarity detection:
- Identical– 1 to 1 exact word matches, highlighted in red
- Minor changes– text with minor variations from the source but conveying the same meaning. Example: changing “he was running” to “he ran”. Highlighted in light red.
- Paraphrased– text that is rewritten using different words or sentence structures, but the core idea remains the same.
- Omitted– the portion of text that is not being scanned for plagiarism based on the scan settings. (example: the ignore quotations setting is enabled, and the document is 20% quotations = the omitted words percentage is 20%), unhighlighted.
We also provide information on how much of the text you are not scanning for plagiarism (omitted words) based on your scan settings.
Any plagiarism checking tool can potentially miss small elements. However, Copyleaks works hard to provide an extensive plagiarism checker that ensures 100% authenticity of original content, whether it’s our online plagiarism detector or through an LMS or API integration.
Plagiarism checkers vary in accuracy. We take pride in using the very best of machine learning, multi-language capability, and Multi-language and extensive search capabilities to provide you with the most accurate plagiarism results. Our commitment to innovation means we’re improving every day.
Google, Edge, and more. When scanning against the internet, Copyleaks goes beyond site-by-site to detect plagiarism. In fact, each search spans across all publicly accessible sites in the United States and worldwide that would be found through the most popular search engines.
No. 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.
With our Similarity Report, you can view your document’s overall percentage of similar content. Additionally, we separate similar content into three categories: Identical, Minor Changes, and Paraphrased.
The report breaks down these categories by different percentages. You can customize the report to focus on precisely what you want to see.
Our plagiarism detector scans text from all open-access journals and databases to detect plagiarism online. This includes over 16,000 academic journals and publications from Frontiers, Wiley, Elsevier, and thousands more.