Scheduled maintenance: Jun 25 from 16:00–17:00 CEST

For greater accuracy, we’re upgrading Plagiarism Checker to count words rather than pages. During the upgrade, you can still access Scan History. You’ll need to wait for the upgrade to complete to scan new files.

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

🔍  Monthly scan

100 pages (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 100 pages per month with a Premium subscription to our advanced Plagiarism Checker. A single page is up to 250 words.

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
    (100 pages/month)

  • Create unique summaries using custom instructions

  • Faster processing speed

  • Premium recommendations

  • Compare Modes

  • Tone insights

  • Paraphraser History

3-day money-back guarantee


  • You will receive 100 pages every month with your Premium subscription. Additional pages may be purchased if you need more.
  • Free users can scan up to 3,000 words per month. Every page is about 250 words, so free users can scan the equivalent of 12 pages per month.
  • If any portion of the standard 100 pages per month is not used, they will not roll over to the next billing period. Additional pages purchased will never expire unless consumed.
  • Free users can scan 3 times per month, and those scans will not roll over to the following months. You will need to upgrade to Premium or wait until the next month to continue scanning.
Yes, as a Premium user you can purchase more pages. It's $2.45 for 25 pages, $8.95 for 100 pages, and $19.95 for 250 pages. Click here to upgrade to a Premium subscription.
We support the following textual file types: .html, .txt (UTF-8 encoded), .csv, .rtf, .xml, and .htm. We also support non-textual file types, like .pdf, .docx, .doc, .pptx, .ppt, .odt, .chm, .epub, .odp, .ppsx, .pages, .xlsx, .xls, and .tex.
  • The total number of pages that can be used for scanning will be displayed in Plagiarism Checker, and the number of pages scanned will show up in your plagiarism report.
  • For free users, the number of remaining scans will show up in your plagiarism report.
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.