Viper Plagiarism Checker

Welcome to Viper - a leading online plagiarism checker which, using its range of powerful features, can help students, teachers, schools, colleges, universities, and even professionals check their documents for plagiarism and duplicate content.

We're helping thousands of people around the world verify their documents originality every day, and we can help you too!

Start scanning your work for free or get even more features with Viper Premium!

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Start scanning today!

Powerful features

With its easy-to-use interface and highly detailed scanning process, it only takes three simple steps for Viper to review your document for plagiarism and produce a full report.

  • Upload

    Simply upload your document using the Viper online app and submit it to be checked for plagiarism against 10 billion sources.

  • Scan

    Viper works its magic - it scans against essays, journals, and numerous other sources published on the internet.

  • Compare

    You receive a clear and concise highlighted plagiarism report, showing exactly where your document has matched to other existing content.

  • Pay as you go

    No subscriptions or monthly plans; just buy credits as you need them and use them to scan your work. Don’t want to buy credits? Our free scan option is designed for you.

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Thousands of happy users

Don't take our word for it; let our users explain exactly how our online plagiarism scanner has helped to make their lives simpler and more productive!

Free Plagiarism Check

A free plagiarism check from Viper is perfect if you're looking for a high quality, free, online plagiarism checker for documents of up to 10,000 words.

Free checks are limited to 2 credits every 28 days and can be used as you like to scan either two documents up to 5,000 words in length, or one document of up to 10,000 words.

Learn more about the features of our free plagiarism checker and the additional benefits of our premium service on our features page.