Instantly scan your documents to detect plagiarism. Get real-time and detailed analysis of your content with QuillBot’s advanced plagiarism checker.
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Why use QuillBot's Plagiarism Checker tool?

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 QuillBot's Plagiarism Checker, you can feel confident your writing is properly cited and doesn't contain any accidental plagiarism. Once your check is complete, run your text through our

AI detector

to verify your writing doesn't appear AI-generated before you submit.

Make your writing plagiarism-free with the QuillBot’s Plagiarism Checker

Real-time report and analysis

Easily review any copied content in your writing with QuillBot’s AI-powered Plagiarism Checker. It compares your text against a vast source database and provides a clear plagiarism score along with a detailed report. For even stronger results, refine your draft with

humanize AI

to make the writing sound more natural, and then use the Plagiarism Checker to review the text for potential duplication.

Clear and actionable feedback

Our online 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.

Instant citations for highlighted text

Easily cite highlighted text with our Plagiarism Checker. We've integrated our advanced Citation Generator to make it easier to cite the identified similarities. You can select from APA, Chicago, and MLA styles when citing sources.

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.

Why writers love our Plagiarism Checker tool

Its an awesome app

Its an awesome app, the advanced humanizer works perfectly. Try it for your self

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I like QuillBot's AI
Humanizer the best…

I like QuillBot's AI Humanizer the best because I use it to make AI-written content sound more human. It does a great job. Do you see this paragraph of the review that I wrote with it?

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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. Currently, our tool is available in multilingual languages, You can use the tool directly in your preferred language by visiting our localized Plagiarism checker pages:

Spanish


French


German


Portuguese


Dutch



Simply upload your content, and our plagiarism scanner tool will check for possible plagiarism in your writing and generate the plagiarism score.

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.

QuillBot’s Plagiarism detector continuously updates its source database to deliver accurate and reliable results every time you scan.

Yes. content can be original and still resemble AI-generated writing. QuillBot AI detector tool helps you to identify AI-generated content, making it easier for you to refine your writing before submitting work.