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Looking for the best way to ensure your content is completely original? Look no further than a quality plagiarism checker!

These powerful tools are designed to help you quickly and easily identify any instances of copied or stolen content, so you can stay on top of your writing and keep your work 100% your own.

Whether you’re a student, writer, blogger, or content marketer, the best plagiarism checkers are an essential tool for ensuring the quality and authenticity of your work.

In this post, I’ll break down tested and trusted plagiarism checkers that can help you maintain the quality and integrity of your content. Let’s get started!

12 Best Plagiarism Checkers

There seem to be a hundred-plus plagiarism detector tools out there. However, most free tools come with ads that detract from the experience. They can be slow and often limit the number of words you can check at once.

This product comparison and review will include a few free plagiarism checkers for your basic needs. They will likely have limited capabilities and restrictions.

We’ll also cover professional and premium platforms (but affordable) built on solid databases and scanners that will give you accurate results.

Review the following comprehensive set of tools to pick the best plagiarism checker the first time.

1. Quillbot

Quillbot is a plagiarism checker that compares your text against billions of pages. You can read my comprehensive Quillbot review that covers its paraphrasing and other features.

What makes it different is that it can scan text in 100+ languages, which is critical for research.

It also accepts a variety of file types, including TXT, PDF, docx, and HTML. 

Once you’ve run your text through the plagiarism checker, you’ll get a report detailing any possible areas that are plagiarized and the source from which these findings came.

QuillBot plagiarism detection results.

This is extremely useful for students, as it can help them avoid unintentional plagiarism.

Additionally, Quillbot has a citation generator feature, making it easy to cite sources. It also has a Paraphraser tool that will rephrase/rewrite your copied content.

It also has a Summarizer tool, QuillBot flow and extensions for Chrome and Word. 

However, there are some drawbacks to using Quillbot. Firstly, you can only scan 20 pages per month, which makes it quite expensive for anyone who needs to carry out bulk plagiarism checks. The o

Secondly, the word limit per scan is 250 words, which can be quite limiting for longer pieces of text. But it is perfect for anyone who needs to check a small number of text while having access to other powerful writing features.

Overall, Quillbot is a useful plagiarism checker for students who need to check their work for plagiarism as long as it’s limited to 20 pages a month at 250 words per page. It can be expensive for students but just right for other writers.


  • Invest in QuillBot Premium to scan 20 pages every month. Each page should have 250 words.
  • The monthly cost is $9.95. And there’s a steep discount for an annual subscription – nearly 50%. Subscribe to QuillBot here.

2. ProWritingAid

ProWritingAid is a great writing tool that offers a comprehensive grammar, spelling, and plagiarism checking tool.

The plagiarism-checking feature is an add-on to the premium ProWritingAid package and it’s not a separate tool on its own. With the plagiarism addon, you get 60 plagiarism checks each year. Checking 500 words would use one check. You can also buy checks in bundles.

It will tell you what percentage of your text is non-original. And how much of that is quoted or unquoted, helping you

It’s also compatible with Google Docs or MS Word, which makes it a great option for online writers.

The features are great, the error accuracy is excellent, and the desktop app is easy to use. Highly recommend this software to anyone who wants an accurate plagiarism check. Especially one that comes with a grammar and spelling checker too.


  • Get a seven-day free plan
  • A flat rate monthly subscription for $20
  • Lifetime plan for $399

3. Scribbr – Powered by Turnitin

Turinitin is a popular plagiarism tool that universities and research institute use to detect plagiarism from internal databases as well as content freely available online.

Scribbr is a plagiarism detector developed by Turnitin that helps students check their work for duplicate content.

There are a lot of useful plagiarism checkers out there for students, but the Scribbr Plagiarism Checker is one of the best. You can read my complete Scribbr plagiarism checker review here.

Not only does it use Turnitin’s official software, but it also compares your work against a database with billions of sources.

This makes it much more accurate than other plagiarism checkers. You can’t get away with copying text and editing a few words. Scribbr will detect such attempts.

Additionally, the Scribbr Self-Plagiarism Checker is perfect for people who want to check for similarities in their own work or the work of their peers.

It will give you a heads-up if your writing is similar to the content in its database, which consists of 99 billion web pages and 8 million publications.

Overall, this is an incredible plagiarism checker that I would highly recommend to students, researchers, marketers, and media houses.


  • Available for free
  • No monthly subscription. Instead, you’re charged according to word count. $19.95 up to 7500 words, $29.95 for 7500-50,000 words, and $39.95 

4. Copyscape

Copyscape for checking plagiarism

Copyscape has been a popular plagiarism checker for years now and for good reason.

Unlike other grammar-checking software, Copyscape specializes solely in plagiarism detection. This makes it much more accurate than other tools.

The free version lets you paste in a URL to check if your content is copied online somewhere else.

Another plus is that you can use Copyscape for a variety of content types – from blog posts to social media posts to LinkedIn profiles.

And if you’re worried about file compatibility, don’t be – Copyscape can handle PDFs, DOCs, DOCXs, RTFs, and TXTs. All you have to do is upload the file or paste in the content’s URL.

The premium version of Copyscape lets you check up to 10,000 pages at once.

The WordPress plugin is great for bloggers who want to make sure their content is unique.

Copyscape also has an API so you can work with internal systems. It’s a great tool for serious publishers.


  • It comes with a free version.
  • The premium edition is 3c per search for 200 words. And 1c for every 100 words after that.

5. Grammarly

Plagiarism checking by Grammarly

If you’re looking for a comprehensive writing tool, Grammarly is worth checking out.

It not only checks for grammar and spelling mistakes, but also for plagiarism. That’s right – Grammarly can tell you if your content is duplicated from other sources on the web.

And it does this by searching 16 billion web pages and academic databases. Not sure if Grammarly is accurate?

The free version will only highlight sentences that contain duplicate content. But with the premium version, you’ll get an originality score, as well as the source of the flagged content.

A view of how Grammarly's plagiarism check works
Grammarly highlights similar content and shows you the source

So you can be sure that Grammarly is a powerful and user-friendly tool for detecting unoriginal content. Use it to improve your writing style, tone, and grammar.

I recommend it for content writers and marketers – make it part of your content toolkit.


  • Grammarly is available for free with limited features, and it doesn’t include all the plagiarism features. You’ll only see a notification that some content is plagiarised. (Note that Grammarly marks common phrases as plagiarized l like ‘to sum up’, ‘when all is said and done’, ‘the best tool is’ and so on.
  • Premium version: $12 per month and it includes the plagiarism checker with all the details you need.
  • Business version: $15 per month per user. Includes plagiarism detection. And also security and team features which are best for enterprises.

6. Skandy

Skandy one of the best plagiarism checker for students and professionals

This is a great free plagiarism checker for students. Unlike some other free tools mentioned here, it isn’t inundated with ads which leads to a poor user experience.

The web version of Skandy lets you copy and paste your content for analysis. The tool can be slow, but it will do an accurate plagiarism check.

Like other free tools, there’s a limit to the amount of content you can check at a time.

But the parts of your work that is copied will be highlighted.

Skandy also has a paid app that’s also available on mobile for Apple iOS and Android! Not something that most of the other plagiarism software here can claim.

Upload files in different formats like Word, PDFs, Text, and Rich Text Files. And what’s more – it can process images with text! You can upload GIFs, PNG, and JPG files and Skandy will check if the text on these images is plagiarized!

It’s also connected to a neural network – meaning that it’s powered by Artificial Intelligence.

Skandy claims to have an error rate of 0% because it verifies content with AI. If you want accurate results and a high-powered checker tool, then this software is a must.


  • Incredibly, Skandy is free

7. Copyleaks AI

If you’re looking for a comprehensive plagiarism detector, Copyleaks is worth checking out.

It can scan documents, code, raw text, and URLs in 100+ languages, and it checks across the Internet and various databases.

You get a detailed report on the findings of each scan, including potential instances of plagiarism.

Copyleaks also offers API integrations to help large organizations and institutes protect against copyright infringement.

And if you need to grade large volumes of written assignments, the Copyleaks AI Grader can do it automatically and accurately. This helps save time correcting essays and papers. And it also reduces errors when it comes to accurate grading.

This tool is one of the best plagiarism checkers that combines AI and the detection of copied material. And it’s a reliable tool that serves educational, research, and academic organizations.


  • Copyleaks is priced along a scale
  • It starts with a free version – 10 pages a year up to 5000 pages
  • The premium version ranges from $10.99 for 25k words to $679.99 a month for 2.5 million words
  • It also has an Enterprise plan with custom pricing.

8. Small SEO Tools

Now we come to a free plagiarism checker that’s great for everyday needs.

If you’re publishing a blog post around 1000 words or want to do a quick check of some content – this is for you.

There are no bells and whistles here, and you’ll get a good picture of whether whole paragraphs or sentences are copied from somewhere else.

Small SEO Tools’ plagiarism checker will tell you what percent of your content is copied. And it will show you which sentences are flagged as duplicate content.

However, you can only check 1000 words at a time and it can be slow. Not a problem if you’re casually checking for plagiarized material a few times a week.

But, if you have large-scale content, then you’ll save hours by using their Pro versions.

They offer four different plants that let you check bulk content. You can use their WordPress plugin, API, and invite more users to your account.

You’ll also get a grammar checker, multiple file upload, data security and a dozen other features.


  • Free
  • Every main tier offers a weekly subscription of $4.99
  • Basic: There are four tiers under Basic. The price ranges from $9.80 to $59.80 on a subscription basis.
  • Classic: It also has four tiers. The price ranges from $24.80 to $79.80 on a subscription basis.
  • Enterprise: Four tiers. The price ranges from $29.80 to $149.80 on a subscription basis.
  • Institute: Also four tiers. The price ranges from $149.80 to $599.80 on a subscription basis.

9. DupliChecker

Like Small SEO Tools, Duplichecker is a plagiarism checker tool that can be used to check for plagiarized content.

The tool is free to use, and you can check up to 1000 words at a time.

The tool is not a good option if you plan to check a large volume of content, as it can be sluggish.

However, it is great if you quickly want to check if your content is plagiarized for free from time to time.

Like the occasional blog post or social media post.

Duplichecker also has premium offerings where you can increase the number of words you want to check.

The premium offering gives you more accurate results, supports multiple formats, offers data security, and more.

Overall, Duplichecker is a good plagiarism checker tool that can be used for checking plagiarism in your content.


  • It’s available for free with limited features
  • Its Pro version works on a sliding scale: starting at $10 for 30,000 words and 100 searches. It only increases from there to over $200 for 1.2M words

10. Unicheck

Unicheck plagiarism checker is one of the most popular plagiarism checkers used by academic institutions worldwide.

It uses an intelligent scanning system to check texts against 40+ billion unique web pages, making it one of the most comprehensive plagiarism checkers available.

Unicheck can also be easily integrated into the most popular Learning Management Systems, where it complements LMS functionalities and helps to make students well-educated and successful.

This feature is critical if you want to get seamless integration with your online courses and LMS systems. You’ll get plagiarism reports that are highly accurate with comparisons across academic and web page content.


  • Unicheck has three plans: Personal, K-12 and Higher Ed, and Business
  • It offers its subscription at a sliding scale.
  • Personal starts at $5 for 20 pages up to 10k pages for $600
  • For K-12 and Higher Ed, you need to request a quote
  • Business plan also starts at $5 for 20 pages and up to 10k pages for $600
  • And you get custom plans

11. PlagScan

Looking for a plagiarism detection tool that’s both powerful and easy to use? PlagScan might be just what you’re looking for.

This tool is one of the most efficient plagiarism detection tools available, and it’s adaptable to your specific needs.

Whether you need a printable PDF or an interactive browser report, PlagScan can do it.

Plus, privacy and legal compliance are top priorities for this company.

You can be assured that your uploaded documents will never be shared with unauthorized third parties.

To get started, simply upload the document you wish to check from your computer, cloud drive, or by drag and drop.

Once it’s uploaded, you’ll be able to see any matches and their corresponding sources in one unique view. No more switching back and forth between multiple windows or tabs.

If you’re looking for a plagiarism detection tool that’s both powerful and easy to use, give PlagScan a try.


  • For $5.99: 6000 words and 6 pages
  • For $12.99: 17,500 words and 70 pages
  • For $24.99: 40,000 words and 160 pages
  • For $49.99: 100,000 and 400 pages

12. Quetext

Quetext is another powerful plagiarism tool that comes with a Citation Generator and DeepSearch technology to provide accurate plagiarism reports. It’s great for students, researchers, teachers, and professionals.

Its most powerful feature is its DeepSearch™ Technology is its in-house machine-learning algorithm that detects plagiarism in your content.

I was particularly impressed with its ability to check for plagiarism across a variety of sources, including websites, academic content, media, news, and textbooks.

Quetext can be a great choice for editors, freelance writers, and other content writing services that need deep searches.

And the editor is really user-friendly, with a side-by-side snippet text feature that makes it easy to see how your text compares to the original sources.

Plus, the proprietary ColorGrade™ Feedback highlights text in different colors based on how close they are to being actual copies of the original content.

Best of all, it provides its services at a very fair price.

Overall, it’s a powerful tool with great capabilities for serious research. If you’re looking for a plagiarism checker, I would recommend giving Quetext a try.


  • It has one free experience where you can check one page with 500 words
  • Essential: Pay $10.49 a month to check 200 pages with 100,000 pages
  • Professional: $20.00 a month for 500 pages and 250,000 words
  • Enterprise: $52.49 a month for 1000 pages and 500,000 words

How to choose the best plagiarism checker for your needs

Software support is important to consider when choosing the best plagiarism checker. You don’t want to make writing mistakes that lead to problems at work or in your education.

Here’s what you should consider:

Some software programs have better customer support than others.

This is especially important if you are not familiar with how to use the software or if you have any questions about its features.

Another thing to consider is how well the plagiarism software matches your needs.

Are you a professor or a researcher? Then you’ll need Quillbot.

If you’re a content writer or marketer, then check out Grammarly.

But if you want to check a small quantity of text to identify duplicate content, then go ahead and use Small SEO tools.

Most of the tools offered here are well-priced. So you can try them out until you settle on one that works for you.

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