10 Best Online Plagiarism Checker Tools to Use Free in 2024

This is a complete list of the best plagiarism checkers you can use online to scan your content and web pages to check for content uniqueness and similarities.

Don’t want to read the introduction? Click here to jump to the Plagiarism checker tools list.

Why does content uniqueness matter so much to your business?

According to Vocabulary.com, they explain the meaning of “plagiarism” like this.

When you rip off someone else’s ideas or work and pretend it’s your own, that’s plagiarism.Vocabulary.com

Read that citation again carefully.

It is known as plagiarism or piracy when someone steals your content and pretends it is their own work.

Why does plagiarisation matter to your business so much?

Even if you are a teacher, college student, university professor, freelance writer, data entry worker, or offline article writer, plagiarism directly affects your business.

For example, let’s say you’ve got an order from a client to write an original article about “The Truth about Abs…”. He is going to publish that article on their blog.

As you might know, the weight loss & fitness industry is way too competitive. So, there are more chances to get your article plagiarized?

What does that mean, “getting your article plagiarized”?

Yes, plagiarism could be done unintentionally.

The more common (and widespread) and lengthier your content is, the more chances to add similar sentences to your article.

That ends up with more similarities.

Once your article’s purity or originality exceeds the recommended plagiarism percentage, you might have been labeled a “content thief.”

How do I get rid of plagiarism? Is there a better way to check plagiarism online?

Yes, luckily for you, there are a few plagiarism checkers.

Some are free tools that work efficiently online, while others are plagiarism software that works on your PC, laptop, and even your mobile device.

I have used a few online plagiarism checker tools as a blogger and SEO guy. They can detect plagiarism quickly and give the location of other copied content.

While very few of those plagiarism detectors can compare each document/webpages/essay.

That means you can find similarities between the two documents. It is beneficial in most scenarios… Without further ado, I will list the best tools I have used and found on the Internet. Feel free to use ANY of the below anti-plagiarism checker tools.

Note: There’s no descending order of the list. So, you can always try ANY plagiarism detection tool and find the best one that suits your needs.

For example, you may use a free app if you’re a school teacher, student, or even an average person. But, if you’re an article writer (doing writing as your professional job) and especially an SEO guy, then you should look for a premium plagiarism checker.

One last word: I promise that if you know ANY other tool you love using for every project to check plagiarism, share it in the comment form below. I will check it out, and if it’s capable, I will surely add it to this list.

OK, that’s all. Here’s the list goes:

Best Plagiarism Checker Tools to Use Today


Writerzen home page

WriterZen is a content creation platform equipped with lots of tools.

  • Keyword explorer
  • Topic discovery
  • Content Creator
  • Plagiarism checker

Related: WritierZen review – Pros, Cons, Pricing, and Alternatives Discussed

If you are a professional writer, blogger, content marketer, or SEO, WriterZen would be your perfect match.


Because it allows you to:

  • Build content outliners (which topic to write on for online articles, essays, and documents)
  • Write content with its content editor
  • Collaborate with team members
  • Check plagiarism

WriterZen’s plagiarism checker is sophisticated. Here are a few features.

  • Check plagiarism on the sentence level. Unlike most other apps, WriterZen checks similar content in each sentence.
  • Include exclude domains from checking similar content
  • Adjust the level of scrutiny set for the Plagiarism checker

And the best part is that Writerzen is a free online plagiarism checker with percentage scoring. Its trial plan allows you to check up to 5,000 words of content copy per day for seven days. If you upgrade to the Premium plan, you can will receive unlimited plagiarism checks.

First of all, head over to WriterZen and create your account.

Once done, go to the Plagiarism Checker page and click on the “New Project” button.

Writerzen plagiarism checker

Once clicked, you will see a popup similar to the one below.

enter content
  1. Enter the project title. If you want to check the content of your school essay, type the essay title.
  2. Import content. There are two ways. One is copying and pasting. The second is importing from a .txt file.
  3. The minimum text length is 20 words, and the maximum word length is 5,000.

WriterZen will scan the web. It usually takes less than a minute.

collecting data writerzen

Once done, you will see your plagiarism report. On this page, you can exclude any domain, share reports with others, see plagiarism scoring with percentage (higher the worst of plagiarized), and see unique sentences and plagiarized sentences.

plagiarized content

The screenshot above shows the plagiarism report for text copied from an article about ContentStudio.

Since the free plan of WriterZen allows you to check up to 5,000 words a day, it’s sufficient for any normal user. If you want to extend the limits, I recommend premium plans. It’s worth the investment.

Grammarly Plagiarism Checker

Plagiarism Checker in Grammarly

Grammarly is my personal writing aid that I use entirely every day.

Grammarly is a powerful online grammar checker, punctuation corrector, better proofreader, and a perfect vocabulary builder that can make your articles errorless, easy to read, search engine friendly, and human-friendly.

I am not going to be very detailed about Grammarly here. But, if you want to learn more about it, refer to my comprehensive and unbiased Grammarly review article.

As a writing tool, Grammarly offers tools for article writers, researchers, entrepreneurs, content marketers, students, and web admins. One of the most renowned tools is the “Grammarly Plagiarism Checker.”

Once you have created your Grammarly premium account, you are ready to scan ANY document to find plagiarism.

Here’s How it works…

Step #1: Log into your Grammarly Account and upload your document. (You can also use the text editor to write your document. Grammarly automatically saves your article, so you can edit your article from anywhere you are)

New Document in Grammarly editor

Step #2: Hover over the “Plagiarism” icon on the left sidebar and enable the plagiarism-checking feature.

Step #3: Wait a few seconds till Grammarly’s plagiarism tool scans indexed web pages to find content equalities. Once Grammarly scans over and detects ANY similar sentences or words, they will be underlined by a yellow line.

Checking plagiarism in Grammarly

Look at this screenshot. As you see, Grammarly has identified that a few sentences are already put in somewhere.

Plagiarism Checker in Grammarly

The “Unoriginaliy” or “Plagiarized” content percentage can be found on the page.

Click on the underlined text to find the web page URL of the copied content. Also there are drawbacks to Grammarly as well. For example, the database is not refreshed frequently, so Grammarly won’t catch newly published content online.

Failed Plagiarism Checker Scenario in Grammarly
An instance of Grammarly failing to find content published recently.

Grammarly works online as a web application and on your PC or laptop. So, if you want to check plagiarism for articles you write in Microsoft Word, you’re just a few clicks away from doing that.

Overall, Grammarly’s Plagiarism Checker is an efficient tool for detecting copied content. The best part is it comes for free with its premium plans. Learn more about Grammarly’s free and paid plan differences.

Grammarly Business will be a good choice if you have a team since your team members can check content plagiarism easily. So, if you’re looking for a perfect tool that checks grammar and punctuation online while working as an excellent plagiarism checker, I recommend you to use Grammarly.

Small SEOTools Plagiarism Checker

Smallseotools plagiarism checker

Another useful tool is to detect already existing content on the entire Internet. SMallSEOTools.com provides various SEO and content writing tools. Its free plagiarism detector lets you check for content plagiarism up to 1,000 words and more in premium plans.

You can upload content to the text editor, add your files from Google Drive (ex, Google Docs files), DropBox, or by entering the webpage URL.

Once you have pasted your content, you can detect plagiarism by clicking the “Check Plagiarism” button. After a few seconds, you will see the result.

Smallseotools Plagiarism Results

The page will contain word count statistics, web pages where the content is available online, etc., You can download PDF and Word reports as well.


Duplichecker Plagiarism Checker

DupliChecker is another free online plagiarism detector with up to 1,000 words per search. Add your content to the text editor and click on the “Check Plagiarism” button.

Duplichecker Plagiarism Scan Results

The scan report will contain results found (i.e., places where your content is embedded), websites, and content similarity percentage. The scan report can also be downloaded as a PDF or Word document.



Plagiam.review is a free content plagiarism detector that lets you analyze content for content theft. The result page will contain possible plagiarism links.

Plagiarism review report plagiarism.review



Copyscape is a popular online web content similarity checker. Enter your web page URL and click on the “Go” button.

The results page will contain web pages your website’s content has been stolen from.

Copyscape Search Results
Copyscape search results

The Premium plan allows you to scan content by entering text into the Copyscape website. Here’s the scan report prior to creating the article about Internet Marketing Forums:

Copyscape Premium Search
Copyscape Premium Search

More Websites to Check Plagiarism Online

Here are more tools:

  1. QueText — This is another free plagiarism detector. Your document will be analyzed based on lexical frequencies, phrase patterns, and other factors. QueText ignores quotations and common phrases.
  2. Semrush Plagiarism CheckerSemrush is a world-class digital marketing toolkit with many tools and features. Semrush’s Content Originality Checker is offered in SEO Writing Assistant and On-Page SEO Checker tools.
  3. Plagiarisma — A multilingual plagiarism checker tool that currently supports over 190 languages. You can download plagiarism software free for computers, use the online tool, their web browser extension, or install the mobile app on your Android device.
  4. Plagium — This tool lets you upload files (PDF, Word, native TXT file) or copy and paste content and check for similar content on the web.

Find Words

Unique content, whether a website, blog, paper, or essay in your school project, is essential to any business or person. Due to various reasons, you will have to check for the uniqueness of your content.

In this article, you discovered various tools and websites that allow you to check for content uniqueness and similarities.

Let us know if we miss any good, reliable plagiarism checker that you know in the comments below.

4 thoughts on “10 Best Online Plagiarism Checker Tools to Use Free in 2024”

  1. Chamal, many thanks for sharing the list of your favorite tools, I’ll check them out. Have you heard about a plagiarism detector called Unplag? I’m using it for five months already and would like to recommend it to other bloggers. There is also a free plagiarism checker< available online. I bet you'll enjoy using it and probably include to your personal list of plagiarism detection tools soon. There is no place for plagiarism and content theft on ProBloggingTricks! Cheers

  2. Chamal this is a great list. Another tool I would add is Copyleaks As a blogger I’ve been using this the past 5 months after seeing my content was being taken and duplicated on a few other websites I did not give permission to. I suggest this for anyone publishing content online!


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