Check out the updated Plagiarism Checker!

Plagiarism Checker now counts words instead of pages. A file that previously cost 20 pages now costs 5,000 words (250 words per page). This means more clarity and accuracy for you! If you have any questions, please contact us.

Detect and prevent plagiarism with QuillBot's online plagiarism checker. Instantly scan your content to detect plagiarism and ensure authenticity.
plagiarism checker

QuillBot's Plagiarism Checker

Ensure authenticity with QuillBot’s Plagiarism Checker

QuillBot’s Plagiarism Checker analyzes whether any section of your text did not properly attribute authorship to content already published on the web or in books, research papers, academic papers, or news sources.

📊  Provides

Real-time report and analysis

🔍  Words/month

25,000 words (Premium subscription)

🌎  Multilingual

100+ languages

🎯  Accuracy


Real-time report and analysis

Real-time report and analysis

Quickly and accurately review all instances of plagiarized writing in your work with our plagiarism detector that provides a comprehensive plagiarism score and report.
Clear and actionable feedback

Clear and actionable feedback

Our Plagiarism Checker easily understands what sections of your document are missing proper citations.
100+ languages

100+ languages

QuillBot’s Plagiarism Checker lets you scan text in more than 100 languages, including English, Spanish, French, Portuguese, Arabic, Russian, German, Greek, Chinese, and Japanese.
Monthly scans

Monthly scans

Scan up to 25,000 words per month with a Premium subscription. You can always buy more words if you need them.

Review your plagiarism report in 3 easy steps:

Get a subscription
Choose from 1 of 3 Premium plans, giving you access to all of QuillBot’s features, including our Plagiarism Checker.
Upload files
We accept a variety of file types including .txt, .pdf, .docx, and .html.
View the report
Receive your report in minutes to view potential plagiarism and relevant source links.

Learn best practices around academic integrity

Be honest
Cite your
Show responsibility
Acknowledge authors
QuillBot is committed to promoting and protecting academic integrity. Our Plagiarism Checker, Citation Generator and guides are built to educate students on best practices to avoid unintentional plagiarism.

Here’s the thing: even paraphrased writing needs citations. Ideas can be plagiarized just as easily as words, so if you take someone’s idea and reword it, it still needs to be cited. Trying to pass off someone else’s idea as your own, with fresh language, is just as unethical as directly copying a quote. Everything that did not originate in your brain needs to be accurately cited.

Our Premium subscription includes the Plagiarism Checker and so much more.


  • 125 words in

  • Standard and
    Fluency modes

  • Limited use of Synonym Slider

  • 1 Freeze Word

  • 1,200 words in Summarizer

  • Plagiarism Checker

  • Create unique summaries using custom instructions

  • Faster processing speed

  • Premium recommendations

  • Compare Modes

  • Tone insights

  • Paraphraser History

No credit card required


  • Unlimited words in

  • Unlimited Custom and
    9 predefined modes

  • Full use of Synonym Slider

  • Unlimited Freeze Words

  • 6,000 words in Summarizer

  • Plagiarism Checker
    (25,000 words/month)

  • Create unique summaries using custom instructions

  • Faster processing speed

  • Premium recommendations

  • Compare Modes

  • Tone insights

  • Paraphraser History

3-day money-back guarantee


Previously, Plagiarism Checker counted the number of pages per scan. We recently updated Plagiarism Checker to count words rather than pages. Scans can now be calculated with more clarity and accuracy.
If you have a Premium account, you can scan 25,000 words per month. You also get a plagiarism score, a detailed list of plagiarized sources, a highlighted section of text for plagiarized and paraphrased content, a download report, and more.
With a Premium account, you can scan 25,000 words per month.
Unused words don’t carry over to the next month, but you can buy more. Purchased words carry over from month to month until you use them.
Yes! With a Premium account, you can purchase:
  • 6,250 words for $2.45
  • 25,000 words for $8.95
  • 62,500 words for $19.95
 Click here to upgrade to a Premium subscription.
We support the following textual file types: .html, .txt (UTF-8 encoded). We also support non-textual file types, like .pdf, .docx.
With a Premium account, the number of words available that month is displayed at the top of the Plagiarism Checker home page. Your scan history will also show you how many words each document used.
QuillBot stores your content in order to run the plagiarism report, so you can access your reports in the future. Our third-party vendor, CopyLeaks, does not store your content. QuillBot will never share your content with any third parties outside of CopyLeaks.
Yes. All Premium users have access to the Plagiarism Checker.