Plagiarism Checker Seo Tools

Plagiarism Checker SEO Tools is a free tool that allows you to check your text for plagiarism. It’s the fastest and easiest way to make sure your content is unique and original.

Plagiarism Checker SEO Tools is a free tool that allows you to check your text for plagiarism. It’s the fastest and easiest way to make sure your content is unique and original.

Plagiarism Checker Seo Tools

Plagiarism Checker Small SEO Tools | SmallSeoTools

The plagiarism checker free utility offered on SmallSEOTools’ is second to none due to the advantages it provides to its users. From students to teachers, researchers, writers, publishers, and bloggers, everyone can gain the top benefits of SmallSEOTools’ plagiarism detector, which include the following:

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Quick and Hassle-Free

The plagiarism checker online tool available on this platform is a super-fast utility that generates results within a matter of seconds. For using this plagiarism detector, the users won’t have to follow any convoluted procedure. The user-friendly interface of this facility makes the process to check plagiarism free from all kinds of intricacies.

Multi-Platform Supportive

Our plagiarism detector is a web-based tool that can be accessed through any kind of device. You won’t have to install a plugin or software for checking duplication with this plagiarism checker online utility. Whether you have an Android, iOS, Windows, Linux, or Mac device, you can easily access our online plagiarism remover and figure out the instances of plagiarism in a couple of clicks. All you need to check plagiarism online on SmallSEOTools is to connect your device with a stable internet connection.

Free of Cost

There are no costs involved with the usage of SmallSEOTools’ duplicate content checker. The users aren’t asked to pay a single penny for the consumption of this online plagiarism check service. No matter how many pieces of text you need to check for plagiarism, you can use this plagiarism detector as many times as you desire without facing any restriction or paying any charges.

Find Matching Sources

When it comes to detecting plagiarism, everybody desires to know about the links from where their text matches. The best free plagiarism checker by SmallSEOTools not only detects the plagiarized portions of your text but also provides you with a list of sources from where your entered text is matching. If you want to keep the list of matching sources as evidence, you can download the plagiarism scan report for free with a single click.


A list of key features:

1. Billions of web pages

This tool has the ability to check plagiarism by matching your content against billions of webpages on the Internet. Once you upload your content, it will automatically run it against every existing content on the web within seconds, making it the most sophisticated yet fastest plagiarism scanner you’ll ever come across in your lifetime.

2. Automatic rewriting feature

It has an option for automatically rewriting the content you run on it in just one click. If your content contains plagiarized work, all you have to do is click on the rewrite option and you’ll be taken to our auto-paraphrasing tool, where your content will be updated immediately. This is a built-in feature available right inside the tool for absolutely free.

3. Multiple document formats

Our similarity checker allows you to upload different formats of documents including .doc, .docx, .txt, .tex, .rtf, .odt, and .pdf. This means it does not matter what format your content takes, as long as it is digital, our tool will do the rest of the work.

4. URL integration

With this free online plagiarism test tool, not only are you able to upload different formats of documents, you can also check plagiarism via a website URL. Simply enter the webpage URL and click the “Check Plagiarism” button and you’re good to go.

5. Reporting option

Our anti-plagiarism engine comes with a reporting option which allows you to download a report of the plagiarism search you run. This means you now have some sort of evidence to send across to the relevant parties and a record to keep. Awesome!

6. Sharing option

How about an option for sharing the plagiarism report generated? Would you like that right INSIDE the tool, too? Well, we got you covered!

7. Multiple languages

This feature allows you to check plagiarism on documents in other languages other than English. So whether your content is written in русский, 日本語, italiano, français, Português, Español, Deutsche, 中文, our tool can speak your language.

8. Cloud compatibility

Live in the cloud? Our originality checker is able to check content from the cloud, including Google Drive and Dropbox. Simply choose where your content lives in the cloud and pick the particular piece of document you want to run, and our copyright checker will do the rest.

9. Local storage

If your content is rather local, living in a file within your computer, then you can upload it directly from the local storage.

10. Percentage gauges

Once you’ve uploaded your content and clicked to check for plagiarism, our duplication checker will show you, in percentages, the levels of both plagiarized and unique content in the document. For example, it’ll let you know that 82% of the content is unique while 18% is plagiarized.

11. A list-based, sentence-wise result

The tool does not stop at showing you the percentage levels of plagiarized and unique content. It also shows you, in a list format for easy detection, both plagiarized (if any) and unique areas of the content piece, sentence-by-sentence. Plagiarized sentences are shown in red while the unique ones are shown in green for your convenience.

12. Highlighted document view

With just one click, you can also see the result in a document view, where the whole content is displayed in one document and the plagiarized materials are highlighted in red.

13. Ability to view matched results

Right within the tool, you can view the external content that matches the red sentences in your document. Plus, the URL of the external webpage is added for a quick and easy examination of the content.

14. One-click comparison feature

After the results are in, you can click on the “Compare” button on any red (plagiarized) line to go to Google and compare that particular content with similar ones already published on the web. Great for finding where the plagiarized content is coming from.

15. Exclude Specific URL

If you don’t want to detect plagiarism for a specific URL? Simply Insert that URL in the Exclude URL box and that’ll be done for you automatically, Copied (plagiarized) content from that URL won’t be countered as plagiarism.

16. Plagiarism Checker API

If you want to develop a real-time multitasking plagiarism detection system, incorporated into your website, then we have your back. The Plagiarism Checker API offers you a great API integration solution. This completely eliminates the need to check each and every article for every student individually and saves you hours upon hours of work and headache. You can check plagiarism for multiple essays, thesis or assignments of your students in just one click. This also works great for big websites who accept dozens of articles from contributors frequently.

17. Plagiarism Checker WordPress Plugin

The Small SEO Tools Plagiarism Checker also has its version of WordPress plugin for checking plagiarism. With it, you don’t need to waste precious time copying and pasting the whole content of your post. Simply install the plugin, and whenever you are working on a new post or page content, click on the “Check Plagiarism” button and the plugin will automatically start checking the full content, sentence-by-sentence. You can also compare plagiarized content within the plugin by clicking on sentences. With this plugin, you don’t have to worry about your content being stolen or the search engines penalizing your site for content duplication.

Importance of Plagiarism detection

Whether you know it or not, plagiarism does affect you in some way. It doesn’t matter whether you’re the content creator or the one who consumes the content, plagiarism affects us all.

As a content creator (writer, author, researcher, student, freelancer, blogger, social media manager, etc. It’s no news that you should be regularly checking to be sure that nobody is copying your content without your permission or giving you credit.

But much more than that, you also have to always run your content on a plagiarism detection tool before publishing or submitting it to be sure that your work does not contain plagiarism.

Why? Because plagiarism is an act of academic dishonesty, a breach of journalistic ethics, and above all, a publishing crime.

As such, you don’t want to fall victim. If your work contains plagiarized content, whether intentionally or by ignorance, you stand to face serious penalties including:

  • Legal actions
  • Monetary restitution and fines
  • Damaged reputation

This is not to mention other consequences like SEO content duplication penalties and lowered rankings, lost trust, possible academic sanctions, and more.

Now, on the other end of the spectrum, as a content consumer or user (reader, professor or teacher who vets students’ work, client of freelance writers, etc.), it is equally important to check for plagiarism before accepting or taking action on any content you come across or submitted to you.

And that is why we created the Plagiarism Checker by Small SEO Tools.

This tool is carefully designed to help you easily and quickly detect plagiarism in any digital text-based content.

It is used and trusted by millions of people all around the world and can easily boast of being the single most sophisticated, feature-rich, user-friendly content checker online.

Yet, we decided to make it 100% free.


Would you like to see all these features for yourself? Start using the tool right now. It is 100% FREE.

This premium-level online tool is extremely easy to use, reliable and provides amazingly accurate results. It is useful for checking plagiarism irrespective of whether your content is an academic work, blog post, ebook, news article, term paper, landing page content, website page content, social media content, email newsletter, and so on.

Built by our dedicated in-house team of highly talented developers, the Plagiarism Checker delivers results super fast. In fact, you can expect results in as little as 0.83 second for 1,000 words per search.

We respect user privacy, and hence do not save your content in our system. Once the tool is done running the plagiarism check on your content, it automatically deletes it from our system immediately.

Go to the Plagiarism Checker page to learn more about the tool and also learn how to use it.

scribbr plagiarism checker

You can find various free plagiarism checkers online that you can use to avoid accidental plagiarism. But how reliable are these tools, and are they really free? To find out, we tested 12 of the most popular free plagiarism checkers.

We uploaded test documents featuring a total of 180 different source texts, which were either directly copied from the source or edited to disguise the plagiarism.

Our in-depth research shows that free checkers are unable to detect most plagiarism in our test documents, whether the text was edited or unedited. The Scribbr Plagiarism Checker is still the best option for reliable plagiarism detection in 2022.
The table below shows our ranking of the free plagiarism checkers we tested, along with the Scribbr Plagiarism Checker for comparison.

Plagiarism checker Overall score 100% free? Restrictions
Scribbr 4.7

  1. Quetext 3.3 Free trial of 1 scan (2,500 words)
  2. Grammarly 3.2 “Free” version gives no information
  3. Unicheck 3.0 200-word free trial
  4. Check Plagiarism 2.3 Limits not clearly explained
  5. Plagiarism Detector 2.2 1,000 words / check
  6. Pre Post SEO 2.2 1,000 words / check
  7. Search Engine Reports 1.7 1,500 words / check
  8. Small SEO Tools 1.7 1,000 words / check
  9. DupliChecker 1.7 1,000 words / check
  10. Plagiarism Checker 1.2 5 free checks; 800 words / check
  11. Writer 1.2 2,000 words / check; no percentage
    Note: We also tried to test Plagly, but it was unable to generate reports at all, so we were unable to include this tool in our comparison.

Check your paper for plagiarism in 10 minutes
Submit your work with confidence knowing it’s free of plagiarism.

Table of contents
Our process for testing plagiarism checkers
To assess the usefulness of free plagiarism checkers, we focused on four main questions:

Is the checker actually free?
How much plagiarism does it detect?
How easy is it to use?
How trustworthy is the site?
We used the same test documents in all cases, divided in different ways to match the tools’ different word limits. The documents contained a variety of source types, including text copy-pasted directly from sources and text that had been edited in various ways.

We analyzed the data by looking at the plagiarism percentages shown and whether the tool was able to find full matches (showing the right source for a full plagiarized text) or only partial (matching different sentences to different sources).

Note: You can read about our testing methodology in more detail in this article.
General conclusions: Free vs. paid checkers
We found that free plagiarism checkers were frequently misleading in their advertising and that they were lacking in many ways compared to paid services. Our research led to these conclusions:

Free checkers Paid checkers Scribbr Plagiarism Checker
Average plagiarism percentage 21% 41% 95%
Detects paraphrasing plagiarism?
Able to find full matches?
Pricing Often misleading: only a trial, or not free at all Confusing subscription plans Transparent one-time payment per check
Word limits Usually <1,000 Varies with subscription plan No limit
Trustworthy? Hard to know your documents are safe Usually more accountable Data not sold, stored, or shared; documents automatically deleted
User experience Buggy sites, no live support Fewer bugs, some live support Live support, happiness guarantee, smooth interface
Reports Sometimes not downloadable, not very readable Downloadable, somewhat clearer Clear report with different sources color-coded, clickable text, downloadable
Scribbr review
best plagiarism checker scribbr

Finds far more plagiarism than free checkers
Detects plagiarism even in edited texts
Won’t store or sell your documents
Money-back happiness guarantee, with live support available
Self-Plagiarism Checker allows you to check for self-plagiarism
Not free
Scribbr’s Plagiarism Checker is not a free service, but it’s also not a subscription. Instead, you pay a simple, transparent price per plagiarism check ($19.95–$39.95, depending on the word count). There’s no word limit, so you can upload as big a document as you want.

Quality of matches
Scribbr’s checker, developed in partnership with Turnitin, heavily outperformed all free checkers (and other paid checkers) in terms of the amount of plagiarism detected: 95% vs. an average of 21% across free checkers.

It performed particularly well with source types relevant to students, such as journal articles and dissertations. Importantly, Scribbr was far more successful than other checkers at detecting plagiarism in heavily edited texts, showing it has no trouble with paraphrasing plagiarism.

Scribbr could also consistently provide full matches instead of partial ones, matching the whole plagiarized passage to the correct source.

You see your results in a straightforward downloadable report. Different sources are highlighted in different colors, making it more readable.

The issues identified can be fixed with Scribbr’s Citation Generator (which is 100% free), generating correctly formatted citations wherever they are needed.

In addition, Scribbr offers a Self-Plagiarism Checker. This unique tool allows users to upload their own unpublished documents in addition to the public database, to detect any possible self-plagiarism.

However, you can’t edit your text directly in the tool, and it’s not possible to re-check your document for free.

Scribbr will not store, sell, or share your uploaded documents. Data is automatically deleted after 30 days, or students can opt to manually delete their document after the check.

Live customer support is offered in multiple languages to assist users. A guide to using the Plagiarism Checker and other free resources explaining plagiarism issues are easily accessible.

Scribbr also has a happiness guarantee: if you’re not satisfied with the tool for any reason, you can ask for a new check or a refund.

  1. Quetext review
    que text

Clear and detailed plagiarism report
Built-in citation assistant helps to add missing citations
Documents not stored in database
Support options available (but no live support)
Partial matches and false positives
Not clear how the free trial works
Monthly subscription of at least $9.99 after free trial
Not effective for scholarly sources
Doesn’t detect all plagiarism
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 short.

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.

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.

Quality of matches
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.

The scanning process on Quetext is quite slow. Once it’s over, the plagiarism report is straightforward to understand and provides a useful overview. An overall plagiarism percentage is shown, with similarities in the text highlighted.

Different sources are not highlighted in different colors. Instead, orange highlighting is used for partial matches, red for full matches. Clicking on a highlighted sentence shows you the matching source text, with another percentage indicating how similar your sentence was to the source.

There’s also a built-in citation assistant that can help you fix plagiarism by adding citations. Unfortunately, it’s not very robust. Citations generated this way may not be accurate, and you have to add a lot of information manually.

Quetext states that it doesn’t save your text to a database and that all text submitted remains private and encrypted.

Information about the service is available in the form of FAQs on the website, and it’s also possible to contact the company by phone or email.

Discover Quetext’s plagiarism checker

  1. Grammarly review

Typically finds the actual plagiarized source
Language and citation assistant available
Does not sell or share documents with third parties
Not free!
Not as effective with edited texts
Same colors used for different sources
Despite the way it’s advertised, Grammarly’s plagiarism checker is not free. All you can do with the free service is see a screen that tells you there’s plagiarism in your text without giving you any details of where it is, how much of it there is, or what the sources are.

After this you’ll be directed to download the Grammarly app and subscribe to their premium service ($30 per month). There’s a limit of 100,000 characters (about 20,000 words) even after paying.

Quality of matches
Grammarly performed better than most free checkers at finding full matches, and it was usually able to find the right source for a piece of plagiarized text. That said, its overall percentage (43%) fell short of Quetext’s and was far lower than Scribbr’s.

It performed well with unedited texts but relatively poorly with edited ones. With these, it often gave false positives.

As a premium service, Grammarly has a clearer and more visually appealing style than most free checkers. The tool does still use the same color for all sources, though, making the results hard to parse.

The checker temporarily removes the original formatting while editing the text, but the layout is restored after downloading the document.

The subscription also gets you a language and style tool and a citation assistant.

Grammarly does not store, sell, or share documents with third parties.

The site provides a support page with tips, tutorials, and FAQs, and you can submit a question via a form. Live support is not available.

Discover Grammarly’s plagiarism checker

  1. Unicheck review

Tends to identify the correct source
Doesn’t sell or share documents without permission
Live support is available
Have to pay after a very short free trial
Unclear report—hard to identify the source
Same highlight colors for different sources
Several matches for one sentence
Unicheck offers a free trial, but with a very small word limit of 200 words. It’s unlikely that your document will be so short that this trial is useful to you, but at least you can try out the service before paying.

After the trial, the pricing is based on the number of pages: $5 for 20 pages, $10 for 50, $15 for 100.

Quality of matches
Unicheck was able to fully match some plagiarized passages with their source texts, unlike most free checkers. However, the percentages it detected overall (44%) were comparable to those of Check Plagiarism.

The report also tends to match a single piece of text with multiple sources, meaning the results are not decisive.

Plagiarized text is highlighted in the report, but all in the same color, so it can be difficult to match a sentence with the relevant source at a glance.

Additionally, because the reports tend to provide multiple sources for a single sentence, they’re not very readable, and it can be hard to tell what to do to fix a particular instance of plagiarism.

Unicheck stores uploaded documents securely, and the site states that your document will not be sold or shared.

Live chat support and a help center with tutorials and guides are available.

Discover Unicheck’s plagiarism checker

  1. Check Plagiarism review
    Check Plagiarism

Genuinely free for most purposes
Detects a high amount of plagiarism for a free checker
Documents not stored in database
Generous 5,000-word upload limit
Confusing and difficult-to-read reports
All text formatting is lost in the report
Scans sentence by sentence—no full matches
Site is very buggy
For most users’ purposes, Check Plagiarism 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.

Quality of matches
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.

You can check up to 5,000 words at once on Check Plagiarism, which makes it more practical than other free options for checking longer texts. However, the site was quite buggy, and the reports it generates are not very readable or helpful.

In the downloadable report, the whole text appears as a single block with all formatting removed, then again in the form of individual text fragments colored red or green depending on whether plagiarism was detected. In this second section, the same text is repeated over and over again if multiple sources were found for it.

Below this, there’s a numbered list of the sources that were identified for each instance of plagiarism, which it’s difficult to cross-reference with the text above.

The version of the report shown on the site itself is slightly better. A “Compare” button next to the plagiarized text allows you to see the text identified as the source. It’s still messy and repetitive, though.

Check Plagiarism claims that the reports generated on their site are deleted instantly and that documents are not stored in any internal database.

There are some FAQs listed on the site, but the answers provided are not very clear and some information is contradictory. For instance, the word limit for an upload is claimed to be 10,000–15,000 words in one place, but in fact it is 5,000 words.

Discover Check Plagiarism

  1. Plagiarism Detector review
    plag detector

Free to use (1,000-word limit)
Performed relatively well with edited texts
Technical issue where only the first part of a long document shows matches
Difficult to match text with sources in the report
Different sources highlighted in the same color
No live support available
Plagiarism Detector 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.

Quality of matches
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.

Plagiarism Detector’s reports are not very readable. The same colors are used for different sources, and hovering over a plagiarized section doesn’t show you the source. Instead, you need to find it in a separate list.

Plagiarism Detector states that it will not store or sell your documents. No live support is available, but there is a help request form.

A rewriting tool is also offered on the site, claiming to rewrite text for you automatically to avoid plagiarism. Services like this should be avoided, as they’re unethical and unreliable.

Discover Plagiarism Detector

  1. Pre Post SEO review

Free (only 1,000 words per search)
Color-coded highlighting
Some full matches
Detects a low proportion of plagiarism
Report is hard to read
Messy, ad-heavy page design
Color coding doesn’t distinguish between different sources
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.

Quality of matches
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.

Pre Post SEO states that it does not store or sell your documents. There’s no live support on the site, but there is a form you can use to request support.

Like some other sites, Pre Post SEO offers an automatic text rewriter to resolve plagiarism issues. This tool isn’t a reliable or ethical way to paraphrase, and you’re much better off resolving any issues manually.

Discover Pre Post SEO’s plagiarism checker

  1. Search Engine Reports review

As many free uploads as you want
Decent 1,500-word upload limit
Documents not stored in database
Lots of distracting ads
Unreliable methodology using Google
Reports are not very informative
Text containing certain characters causes bugs
Can be very slow
Search Engine Reports offers a free plagiarism checker 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.

Quality of matches
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.

The scanning process is noticeably slower than on most sites, taking several minutes per document. In the case of one particular document, the scan for some reason took around half an hour.

The report shown on the site gives a list of individual sentences marked as plagiarized or original. You can click a link next to each source, but all it does is google the sentence in question. The downloadable report highlights plagiarism within the text and shows a list of sources, but it doesn’t clearly link each sentence with a source.

We also noticed that uploading a document containing the “less than” symbol (<) caused a bug where the report omitted all text following this symbol, making the results useless.

Search Engine Reports claims not to store any uploaded content in their database. It’s also not required to register to use the site.

The site does offer an “Article Rewriter” tool that paraphrases text automatically. We advise you not to use this kind of tool. Feeding text into a service like this is not a legitimate or effective way to paraphrase.

Discover Search Engine Reports’ plagiarism checker

  1. Small SEO Tools review

Free, although with a relatively small word limit per check
Various options for document uploads (although some are faulty)
Documents not stored in database
Reports not very clear or readable
Low level of plagiarism detected
Text containing certain characters causes bugs
Page is slow, somewhat confusing, and full of ads
Scans individual sentences rather than full texts
Small SEO Tools 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.

Quality of matches
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.

The page hosting the Small SEO Tools plagiarism checker is cluttered with a lot of ads which you can easily confuse with the buttons you need to press. The scanning process is fairly slow. It takes some time for the page to indicate it has started, so you might initially think the upload has failed.

As with some other checkers, uploading a document containing the “less than” symbol (<) caused a bug where the report omitted all text following this symbol, invalidating that report.

The report itself is not very clear. All plagiarized text is highlighted in one color and not clearly matched with the source identified for it, even when the “Matched sources” option is selected.

Small SEO Tools claims not to store your content after checking it. You don’t have to register to use the plagiarism checker. If you do register, there’s a support email you can contact to deregister and remove your personal data.

The site also offers an “Article Rewriter” tool, which automatically paraphrases text for you. Tools like this function poorly and are dishonest, sowe don’t recommend using them. The point of paraphrasing is to show that you have understood the information you’re referring to.

Discover Small SEO Tools’ plagiarism checker

  1. DupliChecker review

Free (1,000 words per scan)
Doesn’t save uploaded documents
Relatively user-friendly reports
Distracting ads for other services
Very low level of plagiarism detected
Performs very poorly with edited text
No color coding for different sources
DupliChecker’s 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.

Quality of matches
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.

DupliChecker’s website is unfortunately full of ads for their other services and for similar sites. A distracting animated “Make it unique” button appears in the report, advertising their rewriting tool.

The formatting of the document mostly remains intact in the report, making it relatively readable. Plagiarized text is highlighted (though all in one color), and you can click on it to be shown the source it was matched with.

The site claims not to save uploaded documents, and it deletes content after the check is complete to avoid data leakage. No live support is available, but there is a contact form, as well as a feedback form.

Like some other sites, this one offers a “Paraphrasing Tool.” These tools are not effective at producing coherent text, and they go against the ethics of academic writing, so we advise against using them.

Discover DupliChecker

  1. Plagiarism Checker review

Uploaded documents not stored/sold
Detects an extremely low amount of plagiarism
Misleading about costs—only free for five documents
Very low word limit of 800
Lots of ads and pop-ups that interrupt the scan
Option to download the report is broken
Essentially just runs your text through Google
Sometimes fails to generate a report
The Plagiarism Checker site claims the tool is free, but it actually only allows you to upload five documents before requiring you to sign up for one of their many premium plans. These documents have an unusually low word limit of 800.

The premium plans offer options to increase (but not remove) this word limit. The cheapest is $10 per month, which only increases the limit to 1,000 words—not a great deal.

Quality of matches
Plagiarism Checker gave some of the worst results out of all the checkers we tested, with an average of 16%. It was never able to provide a full match for a source text, only partial.

Its level of plagiarism detected in unedited texts was lower than most other tools, and in edited texts even worse. Its method of detecting plagiarism seems highly unreliable.

The Plagiarism Checker site is very frustrating to use, due to the high number of ads it displays. This includes pop-ups that appear during the scanning process and interrupt it until you click on them.

The scanning process sometimes gets stuck and fails to generate a report, requiring you to start over. There’s supposed to be an option to download your report, but we found that it didn’t work, so you can only view the report while you have the page open.

The report contains a “Compare results” button, but all it does is google the phrase in question—not a reliable method. There’s no clear overview of sources.

The site claims that uploaded content is not stored in a database or shared with others. It also claims that “our advanced AI-powered algorithm ensures that your content must be protected under the copyright laws.” It’s not really clear what this means.

Like other sites, they also offer a “Paraphrasing Tool.” We recommend against tools like this, which are both ineffective and unethical.

Discover Plagiarism Checker

  1. Writer review
    Writer screenshot

Clean, straightforward design
Web version is free (up to 2,000 words per check)
Browser extension version detects no plagiarism at all
Browser extension costs money (after a free trial period)
Web version provides too little information
Long scans with no indication of progress
Can’t upload documents, only type or paste in text
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.

Quality of matches
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.

Though the Writer site has a nice, clean design, the checker itself is not very practical to use. In both versions, you can only type or copy-paste text into the checker—there’s no way to upload documents directly.

As mentioned above, the website version also doesn’t show an overall plagiarism percentage, only individual matches, making it less useful than other checkers. The interface for scrolling through individual matches is quite awkward to use.

The checker can also take a while to scan your text, and you’re given no indication of its progress as it does so.

Writer claims its plagiarism checker is secure and safe to use, and that it won’t share your information with anybody. A detailed security policy is described on a separate page.

It’s possible to contact the company at various email addresses, including one specifically for security issues. There’s no live support, though, and the “Help Center” page doesn’t offer much information.


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