10+ BEST Plagiarism Checker Software (Free/Paid)

Plagiarism is intellectual theft and fraud that involves using someone’s content without permission. It does not provide any credit (either accidentally or deliberately) to original author of the work. Plagiarism also involves unauthorized reuse of previous content and passing it off as new work.

A Plagiarism Checker is application available online that can check a document or some portion of it for plagiarized or duplicate content. These applications scan the internet for other copies of content or documents. Many such tools allow you to check web site URL or add content from documents (.rtf, ex, .doc, .pdf,.txt, .docx, and .odt).

Following is a handpicked list of Top Plagiarism Checker, with their popular features and website links. The list contains both open source (free) and commercial (paid) software.

Top Pick
Plagiarism Checker X

Plagiarism checker X is easy to use an accurate plagiarism scanner. It is one of the best plagiarism checkers for research papers that allows you to effortlessly compare contents in bulk.

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Best Plagiarism Checker for Research Papers: Top Picks

Name Cost Database Link
👍 Plagiarism Checker X Free 20+ billion Learn More
👍 Grammarly Free 16+ billion Learn More
ProWritingAid Free Trial 20+ billion Learn More
CopyScape Free Search Engine Database (Google) Learn More

#1) Plagiarism checker X

Plagiarism checker X is easy to use an accurate plagiarism scanner. It is one of the best plagiarism checkers for research papers that allows you to effortlessly compare contents in bulk.


  • It one of the best plagiarism checker for research papers that can detect plagiarized information through multiple search engines.
  • The application allows you to compare the content side by side without any hassle.
  • Plagiarism checker X keeps your data private.
  • It allows you to import DOCX, DOC, PDF, HTML, and RTF.
  • This application supports multi-language, including English, French, Spanish, Italian, and more.
  • You can get color-coded density-based results.
  • Provides 24/7 supports.

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#2) Grammarly

Grammarly is a widely used tool for checking grammar and plagiarism. This application can detect plagiarism from numerous web pages. It helps you to know whether your text contains duplicate content or not.


  • This application allows you to search the content in batch.
  • Grammarly provides plagiarism alerts when text matches with online text or in the database.
  • It helps you to detect plagiarism by checking your text against over eight billion web pages.
  • It offers numerous writing styles, suggestions for grammar, vocabulary, and syntax.
  • Grammarly instant report lets you know how many duplication issues are there in the content.
  • The tool calculates the overall originality score for your document.
  • This plagiarism tool keeps your writing private.

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#3) ProWritingAid

ProWritingAid is a tool that enables you to check your content against many web pages, academic paper, publish work to ensure uniqueness. It allows you to run a plagiarism report online or through add-in.


  • It helps with self-editing.
  • ProWitringAid provides more than 20 in-depth writing reports.
  • You can integrate it with word, Chrome, Google Docs, Gmail, and more.
  • The tool is easy to use.
  • Supports a wide range of files.
  • It helps you to find instances of your work that includes data, questions, ideas, wording, and more.
  • ProWritingAid enables you to maintain the governorship of your words.

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#4) CopyScape

CopyScape is a cloud-based tool that allows you to search for plagiarism and find various instances of content theft. It can be easily used by typing the URL of the original content. It is one of the best free plagiarism checker that allows you to perform unlimited scans for web page copies.


  • Search the content in batch.
  • It allows you to compare two content side by side.
  • This plagiarism tool provides a private index to check for duplication within your content.
  • Allows case management or tracking facility.
  • This website to check plagiarism allows you to filter out the result from the other site you already know.
  • It offers a user-friendly environment.
  • Supports offline content indexing.

Link: https://www.copyscape.com/

#5) Copyleaks

Copyleaks is one of the best plagiarism checkers that allows you to work with more than 100 languages online. This application can perform an extensive search across the internet and various databases to find duplicate content.


  • It offers comprehensive reports.
  • This professional plagiarism checker provides an automated grading tool.
  • You can integrate with MS Word, Google docs, and more.
  • It helps you to protect your content your team has written.
  • Offers code plagiarism checking feature.
  • You can compare two files.
  • This plagiarism checker for students can crosscheck documents against online resources and private databases.

Link: https://copyleaks.com/

#6) Plagscan

Plagscan is one of the best plagiarism checkers that helps you to find the percentage of matched text in the document. This application provides easy to analyze the report in PDF or word document. It is one of the best plagiarism software that enables you to collaborate with friends. Plagscan allows you to quickly whitelist or source you like.


  • This application can highlight all matches in the documents, including web and internal sources.
  • It allows you to work offline.
  • You can share a plagiarism report with other people.
  • Plagscan allows you to upload or drag and drop the document.
  • Compare documents with matched sources side by side.
  • You can upload a document to check from your cloud drive, computer, or by drag and drop.
  • It allows you to share or delete your documents.

Link: https://www.plagscan.com/en/plagiarism-reports

#7) Unicheck

Unicheck is a plagiarism scanner that helps you to achieve authenticity by pointing out the similarity. This application supports numerous file formats and bulk uploads. It provides a detailed report to review your plagiarism. Unicheck searches from web pages, institutional library files, and educational databases.


  • Provides notification about suspicious content.
  • Offers customizable search settings.
  • The tool can calculate a score in real time.
  • Unicheck provides privacy using encrypted text.
  • Offers bulk data processing system.
  • Provides personalized dashboard.
  • You can check plagiarism in google docs.
  • It allows you to find duplicate content using Google Chrome extensions.

Link: https://unicheck.com/

#8) Quetext

Quetext is one of the best plagiarism checkers that use word placement and smart algorithms to find duplicate content. This plagiarism checker for thesis identifies text in webpages, news sources, online textbooks, citation generators, and more. This application easily spots exact matches with the corresponding color.


  • Quetext provides a comprehensive plagiarism score.
  • This online free plagiarism checker for teachers offers easy to use user interface.
  • You can check plagiarism with just one mouse click.
  • It keeps your data private.

Link: https://www.quetext.com/

#9) BibMe

BibMe is easy to use tool that enables you to check plagiarism in the document. It allows you to input content from your computer or Google Drive.


  • Offers instant grammar and style suggestions.
  • It helps you to check for unintentional plagiarism and the missing source reference.
  • This online plagiarism checker allows you to create citations for multiple score types and styles.
  • Provides 5 suggestions to improve your writing.
  • It has a user-friendly environment.

Link: https://writing.bibme.org/

#10) SmallSEOTools

SmallSEOTools is a tool for checking plagiarism in any content. It is one of the best plagiarism checker free tool which allows you to upload .rtf, ex, .doc, .pdf,.txt, .docx, and .odt files. This software can check numerous web pages for the duplicate text. SmallSEOTools enables you to effortlessly exclude specific URL.


  • This online plagiarism checker supports Dropbox and Google drive.
  • Allows you to integrate web site URL.
  • It enables you to download a plagiarism report with ease.
  • The generated report can be shared with other people.
  • Supports multiple languages like French, Italian, Portuguese, Spanish, and more.
  • It offers a highlighted document view.
  • This free anti plagiarism checker helps you to compare the result with ease.

Link: https://smallseotools.com/plagiarism-checker/

#11) DupliChecker

DupliChecker is an easy to use tool that enables you to find the content online. It supports varieties of file formats, including, .rtf, .txt, .tex, .docx, .doc, and more.


  • This free plagiarism checker software allows you to search for content with a maximum of 1000 words at a time.
  • It enables you to copy-paste text directly into the search box.
  • This plagiarism software online shows the result in a percentage.
  • Offers paraphrasing tool to rephrase the content and remove plagiarism.
  • It offers a user-friendly environment.

Link: https://www.duplichecker.com/

#12) Search Engine Reports

Search Engine Reports is one of the best plagiarism checkers that enables you to upload files from Dropbox and computer. It is one of the best plagiarism remover that shows plagiarized content in percentage. You can download the search report.


  • It shows unique content in the form of a percentage.
  • You can check the plagiarism by pasting the URL of your website.
  • This tool can compare duplicate content with similar ones available on the web.
  • It provides Sentence wise results.
  • Allows you to view matched results.
  • This anti plagiarism tool has a Highlighted document view.
  • It helps you to rewrite plagiarized content.
  • Search Engine Reports allow you to check more than 200 words.

Link: https://searchenginereports.net/plagiarism-checker

#13) Plagium

Plagium is a tool that helps you to make sure the originality of content by identifying algorithms. You can perform a quick search by simply pasting text into the window.


  • The tool can analyze text, URL, and file.
  • It offers Google Docs add-on.
  • Plagium provides an interactive dashboard.
  • This plagiarism checker software enables you to perform a quick and deep search.
  • It enables you to find plagiarism for 1000 characters.

Link: http://www.plagium.com/

#14) Plagiarismhunt

Plagiarismhunt is online tool that offers plagiarism of given content. It can quickly check files with high accuracy. This application does not save or store in any database.


  • Supported file formats are .docx, .doc, .txt, and .pdf.
  • This paid plagiarism checker software helps you to protect your content.
  • Offers result in percentages based on the originality of content.
  • Check plagiarism with higher accuracy.
  • You can get access to unlimited reports.

Link: https://plagiarismhunt.com/


❓ What Is a Plagiarism Checker?

A Plagiarism Checker is application available online that can check a document or some portion of it for plagiarized or duplicate content. These applications scan the internet for other copies of content or documents. Many such tools allow you to check web site URL or add content from documents (.rtf, ex, .doc, .pdf,.txt, .docx, and .odt).

💻 Which are the Best Plagiarism Checker Software?

Following are some of the best plagiarism checker software:

❗ How does the Plagiarism Checker work?

A Plagiarism Checker detects and exhibits plagiarized content. These tools break your document into small chunks and phrases then search each and every phrase in search engines. Such applications scan the internet for other uses of content or documents to find similar content.

Plagiarism checkers use complex proprietary algorithms to detect similar content in paragraphs, sentences, or ideas. If any page contains the same text, the sentence becomes plagiarized. The plagiarism detection software scans documents in real time provides a precise result.

⚡ What are the legal ramifications of not doing plagiarism check?

There is a high chance that the content you create may contain inspirations from previous authors. If you do not check your content in a plagiarism checker, then it will be violation of the author’s right. In that case, criminal charges can be filed against the violator. If your content breaches copyright laws, then there are high chances you will attract legal action as somebody guilty of plagiarizing.

💥 Is it safe to check plagiarism online?

Most plagiarism checkers comply with data privacy laws. They have strict policy and checks to ensure employee do not have access to the content you create. You can anytime delete the content stored on their servers.

🌟 Is Plagiarism Checker accurate?

The accuracy of plagiarism depends on the Plagiarism software you use. Some plagiarism detectors provide accurate results while some tools offer less accurate results. The accuracy of plagiarism is determined by two factors: algorithm and the size of the database used by Plagiarism software. Some plagiarism checkers are only able to identify direct plagiarism while a good plagiarism detector also identifies plagiarism where similar sentences or words are used.