20 Best Websites For Plagiarism Checker Online (Free and Accurate) in 2023

It is possible to find several free plagiarism checkers online that you can use to prevent accidental plagiarism.


But how effective are these tools, and are they truly free? To find out, we listed 20 of the most popular plagiarism checkers.

The act of plagiarism is equivalent to intellectual theft and fraud involving the use of someone else’s work without permission.

It denies credit to the author of the work (either intentionally or accidentally). The act of plagiarizing also involves the misuse of previous content and passing it off as original.


Plagiarism Checkers are available online and are tools that enable the detection of plagiarized or duplicated content in documents and other documents.

Among these applications, you can search the Internet for other copies of content, Common options include checking web page URLs and adding content from documents (.doc, .pdf, .txt, .docx, and .odt).

The following is a ranking of top plagiarism checker tools, which includes both open source and commercial software.

What Is Plagiarism?


Plagiarism is the act of taking another person’s writing, conversation, song, or even idea and passing it off as your own. This includes information from web pages, books, songs, television shows, email messages, interviews, articles, artworks or any other medium.

When you hear about famous scholars getting in trouble for plagiarism, it usually means they copied exact sentences or almost-exact sentences and phrases from someone else and did not include a footnote or quotation marks or any kind of indication that the words were not their own.

Whenever you paraphrase, summarize, or take words, phrases, or sentences from another person’s work, it is necessary to indicate the source of the information within your paper, presentation, speech, etc.

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20 Best Websites For Plagiarism Checker Online (Free and Accurate) in 2022

1. Quetext

In theory, Quetext offers a free trial of five “pages”—with a page being counted as 500 words. However, we found that after scanning one document of 800 words, the site already said our free trial was over and wouldn’t accept any more documents, however it’s free trial short amount of words.

Additionally, uploading files to Quetext is a Pro feature. If you don’t pay, you’ll have to copy-paste the text from your document instead.

Plagiarism Checker

The paid version costs at least $9.99 per month (more expensive plans are available), which allows you to check up to 100,000 words.

Quetext detects more plagiarism (57% on average) than any 100% free checkers, but it’s unable to match each source text fully to a single source.

Different sentences are attributed to different sources, resulting in a lot of false positives.

Quetext claims to check against webpages and academic sources, but in practice, we found it didn’t perform well at identifying plagiarism from academic sources.

2. Check Plagiarism

For most users’ purposes, Check Plagiarism Checker seems to be free, though the limits aren’t really clear.

The site describes the free upload limit in a confusing way, allowing you a certain number of “queries” (sentences) per month. In practice, though, we found that it was possible to upload all our documents (around 30,000 words in total) without exceeding this limit.

While Check Plagiarism found a relatively low amount of plagiarism in unedited texts, it actually did better with heavily edited texts. Still, its average score (44%) was not that impressive.

Check Plagiarism was not able to identify any sources reliably and in full. Instead it found many partial matches, often showing a large number of different sources for a single piece of text.

There are also many obvious false positives in the results, with common short phrases or even single words being identified as plagiarized, suggesting the checker’s methodology is highly unreliable.

3. Plagiarism Detector

Plagiarism Detector Checker is free to use, with a limit of 1,000 words per document. By paying, you can raise this limit to 25,000 words per document.

Each premium plan offered pays for a certain number of words rather than a certain length of time: for example, $10 for 30,000 words.

Plagiarism Detector’s overall performance was better than average for a 100% free checker (32%), but we did encounter a major technical issue that made some of the results invalid.

With larger documents, this checker stops highlighting plagiarism and showing sources halfway through the text. The plagiarism percentage shown seems to be based on a full scan of the text, but it’s not possible to see the details of the plagiarism past a certain point, making the report useless.

4. Pre Post SEO

Pre Post SEO’s plagiarism checker is a free tool. The only limit is that you can only scan up to 1,000 words in one search. This limit is removed if you sign up for their premium plan, which costs $10 to $45 a month.

Pre Post SEO did find the occasional full match, but in most cases it was only able to find partial matches, like most free checkers. Even with unedited texts, this checker performed relatively poorly. Its overall average was 29%.

The page where the checker is hosted is full of distracting and irrelevant ads, making the user experience frustrating. This is the case even if you do pay for the premium plan.

The tool distinguishes between verbatim plagiarism and paraphrasing plagiarism in the report by highlighting them in different colors. This is useful in theory, but in practice the checker can’t reliably tell the difference between the two.

5. Search Engine Reports

Search Engine Reports Plagiarism Checker offers a free plagiarism that allows you to scan up to 1,500 words at a time. You can upload as many documents as you want, making this a genuinely free service.

The methodology this plagiarism checker uses to find matches appears highly unreliable. It seems to simply search Google for each sentence in your document, counting it as plagiarism if it finds a match.

It also sometimes displays 100% plagiarism even while not highlighting all the text in the document, suggesting a lack of precision in the data you’re given.

It identified only a low proportion of the plagiarism (23%) in our test documents, and due to its methodology it was unable to find any full matches.

6. Small SEO Tools

Small SEO Tools plagiarism Checker is free to use, although you can only check 1,000 words at a time without paying.

You can run multiple checks if you need to scan more than that, although the site requires you to complete Captchas to upload multiple documents. We were able to scan all of our documents without paying.

Plagiarism Checker

Small SEO Tools was unable to identify most plagiarism in our test documents, with an average of only 22%. Since it scans individual sentences separately, it was only ever able to produce partial matches. It performed moderately well with unedited texts, but poorly with edited texts.

It was also difficult to verify how reliable the results were, since the reports generated did not clearly match plagiarized text with sources.

7. DupliChecker

DupliChecker’s Plagiarism Checker service is free, though you can only upload 1,000 words at a time. If you go for one of their premium plans, you can go up to 10,000.

If you do want to upgrade, a large number of different premium plans are offered on the site, which can be somewhat confusing to navigate. The cheapest is $10 a month.

The level of plagiarism detected by DupliChecker was low (20%). It was able to find some full matches, but rarely, since it scans sentence by sentence.

It performed remarkably badly with edited texts, despite claiming to be able to detect paraphrasing plagiarism. With unedited texts, it performed about as well as other checkers like Small SEO Tools.

8. Writer Plagiarism Checker

Writer’s plagiarism checker has a version hosted on their website, and a version that functions as a browser extension. The website version is free, allowing you to check up to 2,000 words at a time.

The browser extension requires you to sign up for a premium subscription for $11 per month, although you get a one-month free trial. We don’t recommend signing up, though, since this version of the checker doesn’t seem to work at all.

In our testing of the browser extension version of Writer, we found that it detected no plagiarism whatsoever in any of our texts, suggesting that this version is simply broken.

The website version was able to detect plagiarism, but it didn’t display an overall plagiarism percentage anywhere, so we couldn’t apply our normal testing methodology. You’re able to see links to websites with matching text, but these matches seemed quite inaccurate.

9. Grammarly

Grammarly Plagiarism Checker is one of the world’s most popular writing assistants, and no wonder: it does a fantastic job of checking written work for linguistic accuracy alongside its readability and tone. It’s also available as an app, as a plug-in for most word processing tools and as a browser extension.

Plagiarism Checker

This is a perfect plagiarism checking tool for content writers to check how good their content is and even make corrections in sentences. The service is free but if you pay you will be able to unlock a lot of features like sentence correction.

I personally use it to check for errors in my writings and it has been useful. They also have a plagiarism checker that is free to use and fast. It helps you scan billions of web pages to show you how accurate your data is.

10. CopyLeaks

This is one of the best platforms for teachers, students, SEO writers, and publishers to check for plagiarism-free. If you have a website the tool here can be integrated to help you check on the go.

Accurate contents rank faster on google and also helps you retain viewers. You get 20 free scans a month but if you pay you to have access to an unlimited number of scans. It is easy to use you just have to visit the website and sign up.

11. PaperRater

This platform is almost completely free but if you want to add more words you need to pay for their premium service. The website is easy to use and they scan through billions of webpages before they offer you a result.

This platform is a great one especially if you are a writing professional. The user interface here is not something I like because of the ads but it gets the job done in checking plagiarism.

12. ProWritingAid

There is a free version of this tool available but if you pay it will help you become better at writing because apart from plagiarism you can also check for grammar.

All you need to do is upload your document and let the site do the remaining job for you. Give this platform trial and see for yourself especially if you are into blogging.

13. Plagramme

Plagramme Plagiarism Checker has a range of features that goes beyond what you’ll find with many other anti-plagiarism tools. It doesn’t just check billions of sources – it highlights your article with plagiarism risks, potentially paraphrased sections, poor citations, and textual similarities. Combine this with a straightforward scoring system, and you’ll be able to quickly see how much of any article is at risk.

This system is multilingual, so it can detect issues in different languages, and Plagramme also offers an authenticity service where its own editors check and fix documents manually. This does cost more, but it’s ideal if you have an important document that needs perfection. And, at the other end of the scale, there’s a free plagiarism checker – although this performs a quick check without the in-depth reporting or database access of the full product.

14. Unicheck

Unicheck is a plagiarism Checker 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.

15. 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.

16. 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.

17. Plagscan

Plagscan plagiarism Checker 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.

18. 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.

19. Plagiarism Detector

Plagiarism Detector is the free and an intelligent and essay checker software. It doesn’t matter if you are a student or a professional, everyone can have benefit from this likewise. Now, with the help of our plagiarism detector, you can check if your content that you are just seconds away from publishing and considering its uniqueness.

If you are web owner, then it is very important to have a plagiarism-free content on your website if you wish to attract maximum traffic. This is the best Free Plagiarism Checker that you will find online as it works the same way as Google.

20. PaperRater

This platform is almost completely free but if you want to add more words you need to pay for their premium service. The website is easy to use and they scan through billions of webpages before they offer you a result.

This platform is a great one especially if you are a writing professional article. The user interface here is not something I like because of the ads but it gets the job done in checking plagiarism.

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Some plagiarism detection software provides accurate results while others may produce less accurate results. The accuracy of plagiarism will depend on the software you use.

In order to assess plagiarism accuracy, two factors are taken into account: an algorithm and the size of the database used by plagiarism software.

While some plagiarism checkers only detect direct plagiarism, a reliable plagiarism detector allows for the detection of plagiarism that may be caused by the use of similar sentences or words.

Your content may contain inspiration from previous writers. If you don’t check your content in a plagiarism checker, it will constitute infringement on the author’s rights.

Criminal charges can then be brought against the violator if their content breaches copyright laws. If your content is found to have violated copyright laws, it is likely you will face legal proceedings in the form of lawsuits.

That’s all about 20 Best Websites to Check Plagiarism Online (Free and Accurate) in 2022.


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