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

QuillBot's Plagiarism Checker

Detailed

Get in-depth analysis of any potential plagiarism

Flexible

Receive 25,000 words/month, with the ability to buy more

Multilingual

Detect plagiarism in 100+ different languages

Accurate

Feel confident that your results are trustworthy

Who can use our Plagiarism Checker?
Academics

Maintain standards of academic integrity in essays, papers, and more

Creators

Uphold ethical writing principles in personal projects or content creation

Business professionals

Verify the originality of reports, briefs, memos, and other business documents

Professional writers

Feel confident that written content delivered to your clients is unique

Legal professionals

Protect your reputation by ensuring opinions, client letters, and more are original

Journalists

Uphold journalistic ethics by confirming the originality of your articles

Ensure authenticity with QuillBot’s Plagiarism Checker

QuillBot’s Plagiarism Checker identifies any text that may lack proper attribution to content from online sources, books, research papers, and news articles. Avoiding plagiarism helps both students and professionals practice integrity and maintain their reputation.

Real-time report and analysis

Quickly and accurately review all instances of plagiarized writing in your work with our plagiarism detector, which provides a comprehensive plagiarism score and report.

Clear and actionable feedback

Our Plagiarism Checker makes it easy to see which sections of your document are missing proper citations.

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

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

Improve your writing with Plagiarism Checker

Running a plagiarism check is an essential part of the writing process. By scanning your work before submitting it, you can ensure you've cited all of your sources properly and haven’t unintentionally plagiarized another writer. Using proper citations is critical to maintaining your credibility and upholding ethical writing practices. Even unintentional plagiarism can damage your reputation, which is why it's extra important to always double-check your work. With our help, you can feel confident your writing is properly cited and doesn't contain any accidental plagiarism.

Review your plagiarism report in just 3 easy steps:

1

Get a subscription

Choose from 1 of 3 Premium plans, giving you access to all of QuillBot’s features, including our Plagiarism Checker.

2

Upload files

We accept a variety of file types, including.txt,.pdf,.docx, and.html.

3

View the report

Receive a report detailing potential plagiarism and relevant source links within minutes.

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

Free
  • 125 words in Paraphraser

  • Standard and Fluency modes

  • Limited use of Synonym Slider

  • 1 Freeze Word

  • 1,200 words in Summarizer

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  • Full use of Synonym Slider

  • Unlimited Freeze Words

  • 6,000 words in Summarizer

  • Unique summaries using custom instructions

  • Faster processing speed

  • Compare modes

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Learn best practices around academic integrity

Be honest

Cite your sources

Show responsibility

Acknowledge authors

QuillBot is committed to promoting and protecting academic integrity. Our Plagiarism Checker, Citation Generator and guides are intended 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, even if it has been reworded, is is just as unethical as directly copying a quote. Everything that did not originate in your brain needs to be accurately cited.

QuillBot Plagiarism Checker FAQs

Plagiarism is when you use another person’s words or ideas in your work without giving them proper credit. This can be in the form of copying another person’s work word-for-word, but it can also mean taking someone’s ideas and paraphrasing them without citing the original author. Plagiarism can be accidental or intentional, but it’s still plagiarism. Intentional plagiarism is when you knowingly take another’s work and pass it off as your own. Accidental plagiarism is when you take another’s work without meaning to, such as forgetting to add a citation. However, accidental plagiarism can still have consequences for your academic or professional career. That’s why it’s always important to check your work with a scanner like QuillBot’s.

Our Plagiarism Checker uses machine learning algorithms to compare your writing to other works in a vast database. Our AI analyzes the semantics and wording of your paper and determines if any content has been taken from other sources without proper citations. At the end of the scan, our tool gives your paper a similarity score that indicates what percentage of your writing is likely plagiarized from other works.

No, you must have a Premium account to use Plagiarism Checker. Premium accounts allow you to scan 25,000 free words per month and purchase additional words. Plagiarism Checker scans include a plagiarism score, a list of plagiarized sources, in-depth feedback regarding which sections of text may have been plagiarized, a downloadable report, and more.

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.

Plagiarism scans are calculated using the exact number of words in your document. When you conduct a scan, the word length of your document is subtracted from the number of words remaining in your account. Previously, our tool counted pages instead of words; this new system is clearer and more accurate.

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, QuillBot's Plagiarism Checker works in 100+ different languages.

Taking another person’s words or ideas and passing them off as your own is always plagiarism, and plagiarism is never acceptable. However, you can use another person’s words or ideas if you give proper credit.

No, Plagiarism Checker cannot detect paraphrased content. However, AI Detector can detect text that has been refined using AI tools.

QuillBot’s Citation Generator can help you create proper citations for any sources used in your text.