Accurate Plagiarism Checker

Accurate Plagiarism Checker

Detect plagiarism from your text quickly and accurately. Our free plagiarism checker scans essays, research papers, or code, highlights matches, and provides easy-to-read plagiarism percentage reports.
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How does our plagiarism check work?

01

Enter text into GPTZero’s plagiarism software

Simply copy and paste text or upload a file into our plagiarism detector, and click ‘Scan’ to check for similar texts.

02

Evaluate your text for potential plagiarism

Get a similarity score and determine what percent of the text matches original sources from online.

03

Review plagiarism report

Find citations to avoid accidental plagiarism and preserve academic integrity.

What is plagiarism?

“Presenting work or ideas from another source as your own, with or without consent of the original author, by incorporating it into your work without full acknowledgement.”

GPTZero’s online plagiarism checker helps you identify plagiarized content by determining how much of the inputted text is original, which was found online and from what sources.

Who uses our plagiarism checker?

Writers and Authors

Safeguard your originality and avoid accidental plagiarism by verifying the uniqueness of your content before publication.

Educators and Academic Institutions

Foster academic integrity in your classroom and teach students the importance of source citation.

Researchers and Scholars

Validate the authenticity of your research findings and avoid unintentional plagiarism by cross-referencing your work with existing literature.

Business and content creators

Maintain credibility and avoid copyright infringement by guaranteeing the originality of your marketing materials, website content, and creative assets.

Identify AI-generated content.

Encourage originality with downloadable reports featuring in-depth analysis of AI vs. human text and classroom writing statistics.

How to avoid accidental plagiarism

Use GPTZero’s plagiarism checker to find similar content from online sources and make sure all work is properly cited.

Integrate with your existing classroom tools.

Add AI plagiarism detection seamlessly to Canvas, Google Classroom and other learning management systems.

ChromeGoogle DocsCanvasGoogle ClassroomZapier

FAQs about our Plagiarism Checker

Everything you need to know about our Plagiarism Checker.

Can’t find an answer? You can talk to our customer service team.

A plagiarism checker scans your text and compares it against content that already exists, typically against a wide database of online sources including academic papers and articles. It shows how much of the inputted text is original, and highlights any overlaps with existing sources. Plagiarism is taking someone else’s words and presenting them as your own without crediting them, and a plagiarism detector helps educators and students to avoid doing this accidentally.
GPTZero’s plagiarism checker is built for accuracy and transparency. We are able to detect plagiarism from over 100M scholarly articles, research papers, websites, and books with confidence. Presenting AI-generated text as your own can also count as plagiarism in many cases. In our tests and third party studies, our AI detector’s accuracy is over 99% in identifying pure AI-generated content.
Yes. GPTZero offers a free plan that covers up to 10,000 words per month. If you need more, you can upgrade to a paid subscription for higher limits.
It’s very simple: either paste the text into the tool or upload a file. The plagiarism checker scans it against a database of sources and quickly returns a similarity score, showing the percentage of overlap with existing content.
GPTZero’s plagiarism checker is the best in terms of accuracy and transparency. We don’t just give you a score: we show you which specific parts of the text might be flagged and link you to the original source. This is what makes GPTZero especially useful for students and teachers who want guidance on how to improve their work.
It can be. If you use an AI tool to create text and then present it as entirely your own, that can be considered “AI plagiarism.” The best practice is to be transparent, and learn to cite AI as a source, making sure your final work is a reflection of your own original thinking.
The similarity score shows how much of your text matches existing sources. Our software compares vocabulary, sentence structure and phrasing, and alerts you when passages sound too much like other sources.
The simplest way to avoid plagiarism is to be transparent, and always give credit when you have used someone else's words or ideas. Add citations when you use someone else’s research and use quotation marks if you’re copying a phrase directly. Running your work through a plagiarism detector is also a good idea as it can ensure your writing is truly original.