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Best Free Plagiarism Checking Sites for Teachers

"Original" graphic
(Image credit: Pixabay/Werner Moser)

Plagiarism is not a new problem. 

The word, derived from the Latin plagiarius ("kidnapper"), dates back to 17th century English. Much earlier than that, in the first century, the Roman poet Martial used plagiarius to castigate another poet whom he accused of appropriating his words. 

In our modern world, however, the ability of students to access and copy others’ work is greater than ever before. While there are a number of in-depth and effective paid solutions for educators to verify their students' originality, there are only a few free solutions that are worth trying. 

Below we have compiled the best free online plagiarism checkers for educators.

  • Check Plagiarism
    In this easy-to-use free plagiarism checking site, simply paste text or upload files to search for plagiarism. To generate a detailed report, including exact matches and sources, create a free account, which allows up to 200 free plagiarism queries, as well as grammar and SEO checks. Paid accounts offer more features and unlimited checks. 
  • Dupli Checker
    Users can check for plagiarism without an account, but only once daily. To do more, create a free account. Dupli Checker is easy to use and allows downloading of Word or PDF plagiarism reports. And it provides a suite of free imaginative and fun text and image tools, including the reverse text generator, favicon generator, and MD5 generator. 
  • Google For Education Originality Reports
    Educators with a Google Workspace for Education Fundamentals account are able to activate “originality reports” for up to five assignments at no cost; students are also able to make use of this service, once activated. Originality reports are created via Google searches for similar content in web pages and books. Unlimited originality reports are available to teachers with paid Google Education licenses. 
  • PapersOwl
    Primarily an essay-writing site, PapersOwl offers a free plagiarism checking tool. Paste in essays or web site content, or upload files; .pdf, .doc, .docx, .txt, .rtf, and .odt files are supported. While it’s true that the site supports students cheating by paying for essays, at least the plagiarism checker is legit free. 
  • Plagiarism detector
    Educators can check for plagiarism without creating an account and download free pdf reports. The site supports multiple languages and offers unlimited free checks. Premium accounts available. 
  • Plagium
    A fairly simple site in which users paste text of up to 1,000 characters and receive free Quick Search results. Easy to use and no account is required. Click on your results to see the matching text conveniently highlighted and presented side by side. Flexible paid plans range from $1 to $100, and offer deeper searching and analysis. 
  • QueText
    With a clean, well-designed interface, it’s a pleasure to use Quetext. After the first free search, you’ll need to create a free account. Unlike many other plagiarism sites, Quetext makes it easy to compare the free and pro offerings -- free accounts allow 2,500 words monthly, while the paid Pro account allows 100,000 words, plus deeper search capability. 
  • Small SEO Tools 
    Teachers can check for plagiarism without creating an account, although there’s a 100-word limit for each search. Accepted file types include: .tex, .txt, .doc, .docx, .odt, .pdf, and .rtf. This platform offers an array of useful text tools, from word counter to text-to-speech generator to image-to-text generator. One of the most unusual is the English-to-English translation tool, which helps users convert American English to British English and vice-versa. Could come in handy if a friend says, “I’m knackered, in need of a loo and skint to boot.”

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