Best Free Online Plagiarism Checker Tools Compared In 2025

Here is a comprehensive review and comparison of the top Online Plagiarism Checker software with features to help you select the best Free Plagiarism Checker tool as per your requirements:

Plagiarism is defined as copying the content and viewpoints of another without authorization. The term means presenting another’s work without giving credit to the original author. There are serious consequences for plagiarism in both the academic and online world.

You can use plagiarism checker software to detect copied content within a document or website. Students, teachers, scholars, and website owners can use the tools to ensure that the content is authentic. It will detect and identify passages in a text that have been copied from another source.

Free Plagiarism Detectors Online: Market Trends

To help you save time in selecting the best plagiarism checker tool, we have reviewed the 10 best tools that offer great value for money. Here, you will also learn about the general features and uses of these applications.

List of the Best Plagiarism Checkers

1. ProWritingAid
2. Linguix
3. Grammarly
4. Originality.ai
5. Plagiarismdetector.net
6. SmallSEOTools
7. Dupli Checker
8. Quetext
9. Plagiarisma
10. SearchEngineReports.net
11. Prepostseo.com
12. Plagtracker.com
13. Edubirdie.com
14. Scalenut

Comparing the Top Plagiarism Remover Tools

#1) ProWritingAid

Best for grammar checking, style editing, and plagiarism checks.

Price: ProWritingAid price starts at $20 per month. Its Plagiarism checks are available with Premium Plus plans, Monthly Subscription ($24 per month), Yearly subscription ($89), and Lifetime ($499 one-time payment).

ProWritingAid is a platform for checking grammar and style. It offers plagiarism checking capabilities with the Premium Plus plan. Your work will be checked for plagiarism against over a billion web pages, academic papers, etc.

Features:

• ProWritingAid allows 60 plagiarism checks per year.
• Free access to the writers resource library.
• In-depth report to strengthen your writing.

Verdict: ProWritingAid can be integrated into Microsoft Word, Google Chrome, Google Docs, Firefox, etc. There will be no word count limits with ProWritingAid. It can help you with creative writing, business writing, and academic writing.

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#2) Linguix

Best for AI-based paraphrasing

Price: Pro Plan will cost $30/month whereas a lifetime plan will cost you $108. You can use the tool for free or also opt for the business plan by requesting a custom quote.

Linguix is a writing tool you can use for grammar verification, paraphrasing, and plagiarism checking. That said, the plagiarism checker isn’t free. Linguix works best as an AI-based paraphraser and proofreader that can enhance your content’s quality tenfold. It makes suggestions that can improve your content based on readability, correctness, and style metrics.

Features:

• Spell and grammar check
• Team style guide
• AI-based paraphrasing
• Content quality score
• Multi-lingual support
• AI-powered paraphrasing

Verdict: Easy to use and driven by an advanced AI, Linguix will serve you well as a plagiarism checker if combined with its core content-enhancing features.

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#3) Grammarly

Best for comprehensive writing feedback including plagiarism, grammar errors, and word use.

Price: The basic version is available for free and only checks the content to detect grammar errors. The premium version’s price starts at $11.66 per month and includes a plagiarism checker, advanced writing feedback, and more. Grammarly for Business starts at $12.5 per user per month for teams of 3 to 149.

Different price packages and features targeted to different users:

Grammarly offers more than just plagiarism checking. The tool is a complex writing feedback tool that checks grammar errors and provides feedback to improve the tone, readability, and clarity of the content. This tool is suitable for students, scholars, website owners, and content writing agencies.

Features:

• Plagiarism check
• Grammar check
• Clarity and engagement
• Browser extensions for Firefox, Mozilla, Safari, Edge
• Word and Outlook add-on

Verdict: Grammarly is an affordable online tool that is used to check plagiarized content and improve one’s writing style and content. You can download the Grammarly app or check the content online.

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#4) Originality.ai

Best for Readability Assessment and AI-generated content assessment.

Pricing: Originality.ai is quite flexible when it comes to its pricing structure. You can either opt for the base subscription model, which will cost you $14.95/month, or go for the $30 pay-as-you-go model.

Originality.ai is a tool that helps you verify whether content is plagiarized. The tool is specifically useful to find out whether content has been generated by an AI tool like ChatGPT, Bard, etc. You can use the platform to scan content on your entire site to find AI-generated content.

Originality.ai also comes with an intuitive Chrome extension, which can visualize your content creation process. This feature is very effective in helping you prove to a client that you truly composed the article by yourself.

Features:

• AI Scan
• Plagiarism Scanner
• Shareable History
• Team Management
• Readability Assessment

Verdict: Originality.ai is a feature-rich and easy-to-use plagiarism detector that we cannot recommend to professional writers and editors enough. The tool will keep your content original and help you avoid costly SEO penalties from search engines like Google.

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#5) Plagiarismdetector.net

Best for detecting unique content of up to 1000 words for free, online. The pro version works with no word limit and doesn’t display any ads.

Price: The basic version of the online plagiarism software is free and allows checking up to 1000 words at a time. The Pro version doesn’t have any word limit and displays no ads. The paid version of the app is available in three categories i.e. Student, Institute, and Enterprise versions.

Pricing details:

Plagiarismdetector.net uses an advanced algorithm to search for duplicate content. The app analyzes content based on word choice, lexical frequencies, and matching phrases. This tool will run the text through millions of sites to check the plagiarized content. It supports documents in Txt, Doc, and Docx formats.

Features:

• Deep search feature
• URL/File uploading
• Real advertising
• Multiple file format support
• Download PDF reports

Verdict: Platgiarismdetector.net is best for students, teachers, and writers. The software supports full data encryption which is best for people who are concerned about data security.

However, one limitation of the app is that it has limited words per search. The free version allows only 1000 words while the paid version allows checking of 6,000 words per search. So, the application is not suitable for scholars or authors who want to check their thesis or book for plagiarism.

Website: https://plagiarismdetector.net/

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#6) SmallSEOTools

Best for checking plagiarism, spell checking, rewriting articles for repurposing content, counting words, and changing text cases for free. You can also use tools for domain analysis, website tracking, backlink and keyword analysis, and more.

Price: Free

SmallSEOTools is a comprehensive tool that lets you perform various tasks to optimize your website. The tools are targeted at website owners. This tool allows you to check 1000 words per search. You can copy and paste content, enter URLs, or upload documents from local drive, Google Drive, or Dropbox.

Further Reading => Best Website Checker Tools 

Features:

• Supports different file formats including PDF, RTF, Doc, Docs, Tex, and Txt
• Plagiarism checker API and Plugin
• Available on Google Play, MacStore, and App Store
• Download plagiarism report

Verdict: SmallSEOTools is best for website owners. This online tool allows you to check your document for plagiarism and more. And the best thing is that you don’t have to pay a single penny to use all the different tools to optimize your website content.

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

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#7) Dupli Checker

Best for examining grammar and plagiarism for free, online. There are also a plethora of tools targeted to website owners and digital agencies, including a paraphrasing tool, spell check, change text case, MD5 generator, image to text, and more.

Price: Free

Dupli Checker is another free plagiarism checker that lets you inspect duplicate content for free. The software is targeted at website owners. You can check the content by pasting the URL link or uploading a document stored on the local drive.

Additionally, there are also different free Dupli tools including a spell checker, word counter, change text case, merge words, grammar check, and many more.

Features:

• Supports different file formats including PDF, RTF, Doc, Tex, and Txt
• Plagiarism checker
• API and Plugin
• Grammar checker

Verdict: Dupli Checker tools allow website owners to optimize web content. The tool offers basic plagiarism checking that is great for website owners. However, students and scholars should look elsewhere for plagiarism checking.

Website: https://www.duplichecker.com/

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#8) Quetext

Best for checking webpages, academic sources, and news sources for plagiarized content for free.

Price: The basic version is free and supports 5 free checks, contextual analysis, fuzzy matching, color grade feedback, and conditional score. The Pro version costs $9.99 per month and comes with additional features, such as citation assistant, downloadable originality report, interactive snippet, and more.

Quetext is an advanced plagiarism-checking tool that is best for students, teachers, bloggers, and website owners. The online tool supports advanced DeepSearch methodology that performs contextual analysis and word placement using smart algorithms. The tool checks and grades the content, allowing users to know about the extent of plagiarized content.

Features:

• Industry-leading privacy
• Fast DeepSeach technology
• ColorGrade Feedback
• Interactive Snippet Text viewer

Verdict: Quetext is an affordable plagiarism checker that is particularly suitable for students and teachers. The tool can also be used by website owners to check for plagiarized content.

Website: https://www.quetext.com/

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#9) Plagiarisma

Best for plagiarism checking for free and can be used by teachers and students as an alternative to Turnitin and Copyscape.

Price: Free

Plagiarisma is a good tool for students and academicians to check content for plagiarized content. A unique feature of this software is that the supports a large number of documents. There is also no word limit per search with this plagiarism testing tool.

Features:

• Supports TXT, RTF, MS Word, PPTX, XLS, PDF, EPUB, FB2, and ODT
• Available on Moodle, Google Play, and Blackberry
• Supports over 190+ languages

Verdict: Plagiarisma is one of the best free plagiarism-checking tools for students, scholars, and educational institutes. The best feature of the tool is a large number of supporting documents. Additionally, the tool supports hundreds of languages, making it great for international students belonging to non-English speaking countries.

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#10) SearchEngineReports.net

Best for free plagiarism checking of up to 2000 words per search.

Price: Free

SearchEngineReports.net supports plagiarism checking of over 2000 words. This online tool lets you check plagiarized content by pasting the text, entering a URL, or uploading files from DropBox or a local drive. You can also use the tool to check grammatical errors in the content.

Features:

• Support 2000 words per search
• Check grammar
• Sentence-wise results
• View matched results
• Download plagiarized report

Verdict: SearchEngineReports.net plagiarism tool is great for anyone who wants to check documents for duplicate content. The free plagiarism-checking app is best for authors, reporters, bloggers, teachers, students, and professors.

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#11) PREPOSTSEO

Best for plagiarism checking of up to 1000 words for free. The premium package supports plagiarism checking of up to 25000 words at a time.

Price: Free plagiarism checker supports up to 1000 words at a time. If you want to check more words, you can opt for premium packages.

Premium package pricing details:

PREPOSTSEO is yet another great tool for academicians and website owners alike. The premium version supports multiple files uploading at the same time. You can check between 1,000 to 25,000 words per search, depending on the selected package. The tool also supports APIs that allow you to integrate the tool with your application.

Features:

• Multiple file uploading
• 24/7 customer support
• Deep Search
• API Support

Verdict: PREPOSTSEO is a great tool that is suitable for multiple users. The online tool supports premium features at affordable prices.

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#12) PlagTracker

Best for fast plagiarism checking of content in multiple languages for free.

Price: Free

Plagtracker is an easy online plagiarism-checking tool. The online tool can check for plagiarism, fix grammar errors, and also proofread the document. Publishers and site owners can verify that the content is original before publishing them.

Features:

• Multiple language support – English, German, French, Romanian, Italian, and Spanish
• Large database of academic papers
• Easy plagiarism reports

Verdict: PlagTracker is great for publishers, academicians, and site owners. The online tool can detect plagiarism for free.

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#13) EduBirdie

Best for checking academic and website content for plagiarized content for free online.

Price: Free

EduBirdie is a free online tool that lets you check online content for plagiarism. The tool lets you check essays and website content. You can paste content or upload documents stored on local drives. You can also hire editors for rewriting or editing at about $13.99 per page.

Also Read =>> Best Paper Checker And Corrector

Features:

• Check essays and website content
• Hire real editors to check documents

Verdict: EduBirdie is a great online tool that lets you check your essay, resume, or website content for free. This tool is targeted at students and teachers.

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#14) Scalenut

Best for SEO optimization and content planning

Price: Scalenut offers flexible subscription plans, which are as follows:

• Essential: $39/month
• Growth: $79/month
• Pro: $149/month

Scalenut is a powerful content planning/management tool with remarkable plagiarism-checking capabilities. The solution makes sure the content you produce is completely plagiarism-free. That’s not all. It also ensures your content is free from grammatical errors, factual inaccuracies, and optimized to scale.

The tool’s capabilities can be attributed to the powerful AI backing it. The AI not only helps produce quality content but also helps you with content planning and research. For instance, you can rely on the solution to come up with an entire keyword plan for your blogs and articles. Furthermore, you can also count on Scalenut for efficient competition analysis.

Features:

• AI-powered content planning and research
• SEO Optimization
• SERP Analysis
• Cruise Mode

Verdict: With Scalenut, you get a lot more than a simple plagiarism checker. This is a powerful content marketing tool businesses, freelancers, and agencies can count on to create high-quality blogs, articles, and web page content that’s ready to rank and factually correct.

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FAQs About Plagiarism Detection Software

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Conclusion

You can find many different types of plagiarism checking tools online. The tools come with varying features that suit various purposes.

If you want a tool for simple plagiarism checking of the website content, the best free tools include Dupli Checker, SmallSEOTools, and Plagiarisma. The best plagiarism-checking tools for students and teachers include Grammarly, EduBirdie, and Quetext.

Suggested Reading => Top Sentence Rephraser Tools

Research Process:

• Time is taken to research this article: We spent about 7 hours researching and writing this article so that you have an easier time selecting the best one that meets your needs.
• Total Plagiarism Checkers researched: 20
• Top tools shortlisted: 10