The Best Plagiarism Checkers to Check Duplicate Content

Plagiarism is an abundant problem, and it exists everywhere. From learning to politics to blogs, books and more - you can find copied content everywhere. Even unintentionally, we write content that is similar to others and that may cause legal issues.

Plagiarism checker tools can help you avoid and fix these issues. These help you not only in making your content unique but also help you improve your writing, save you from accidental plagiarism, offer you a plagiarism report to share with your team and more.

If you are looking for an online plagiarism checker tool, you are at the perfect place.

In this listicle, I have listed some of the best plagiarism checkers that you can use either for free or at a minimal cost. Please note that free online plagiarism checkers are all great but have limitations, so if you are serious about your work and want to check for plagiarism with full confidence, always opt for a premium plagiarism detection tool.

These tools have been tested and trusted by thousands like me and are very effective in their work. You can use these to check duplicate content in your blog posts, essays, theses, research papers and everywhere else where text content can be written.

So, without further ado, let’s hop on to the list.

Best Plagiarism Checkers

To be honest, the market is flooded with hundreds of plagiarism tools but make sure you pick the right software. Poor tools have poor scanning abilities and may give you false positives - which is that your content may still be plagiarised and you won't know.

There are only some tools that maintain these standards of accuracy. These are:

  1. Copyscape
  2. Plagiarism Detector
  3. Plagly
  4. Duplichecker
  5. Writer
  6. Grammarly
  7. Quetext
  8. CopyLeaks
  9. PlagTracker
  10. Unicheck
  11. ProWritingAid


copyscape homepage

Copyscape is no doubt the industry standard in duplicate content checking. It is free to check URLs but you will have to pay to check text content, check your paper or document files. Copyscape charges $0.03 per search (up to 200 words) plus $0.01 per extra 100 words under its premium checker.

copyscape premium search

I have found its premium checker very effective and accurate but the free version is good enough as well.

If you are looking to scan your webpages for duplicate content among your own posts/pages, Copyscape offers Siteliner, an online crawler that highlights how much of your content is duplicated.

Plagiarism Detector

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If you have a huge amount of data, then the Plagiarism Detector is the tool to use. However, you can only check a maximum of 1000 words at a time.

Plagiarism Detector is a free tool that allows you to conduct as many searches as you want.

With deep search technology, you can conveniently convert your plagiarized text into a unique content.


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Plagly is an amazing software that allows plagiarism to check content instantly. It has advanced detection technology that matches your content with all possible data on the internet. With its easy-to-use interface, it can even be used by people with no technical background.


Duplichecker - Plagiarism Checker

Duplichecker is the most renowned name in the SEO tools industry. Marketers call Duplichecker a complete SEO package since the company has a huge range of useful tools to offer. It is by far the best plagiarism tool on the market. It detects plagiarism accurately and checks for grammatical mistakes to improve and correct the user’s text.

To check your plagiarism with Duplichecker, visit their site, where you’ll find a text box. You just need to paste your content into the box and hit “Check Plagiarism”. Your content will be thoroughly matched against the tool’s database and content available on the internet.


image 25 offer a free plagiarism checker too.

It uses an AI assistant to review your text, making it consistently clear and error-free. All you have to do is copy and paste your text into the plagiarism checker box, and all the work is done in less than a minute.

Grammarly Plagiarism Checker

grammarly plagiarism checker

Grammarly is usually known as a tool for proofreading written material and fixing grammatical and punctuation errors. However, it also has a highly efficient free plagiarism detector.

Basic Grammarly features are free but the best features are included as part of Grammarly’s premium package, which gives you full access to its functions.

The biggest advantage of Grammarly’s plagiarism checker is that it has no limit for the number of words and checks that you can carry out.

Once you get a premium account, you can perform as many plagiarism checks as you want.

You simply need to go to the dashboard and turn on this feature.

This is an excellent resource for college students who copy heavily from online sources for their work. It is also a very useful tool for freelance writers who need to check their content from plagiarism and grammar on the go.



Quetext is another useful tool that has been growing very popular among teachers, students, researchers, and professors. It is an efficient plagiarism checker that also serves as a citation helper. Its free version can check your content against billions of similar documents and pages on the internet.

However, it also has a limit of 500 words per search, with only three reports and three search limits as well. If you buy its PRO version, you will get access to numerous other useful features like the DeepSearch™ and ColorGrade™, unique technologies utilized by many well-known plagiarism checkers.

The PRO version can check your content online against over 35 billion pages, one million academic journals, and 20 million books. It also features unlimited searches of 25,000 words each. It also supports several file uploads and gives you PDF reports of the percentage of copied content. Its DeepSearch™ technology enables it to check your material for even the smallest hints of contextual plagiarism instead of simple phrases or words alone. If you want to avoid testing your content against your own older work, Quetext offers exclusion facilities as well. 



CopyLeaks is yet another AI-powered plagiarism checker and a good alternative to other tools like Copyscape premium mainly due to its ability to compare text side by side.



PlagTracker is a relatively simple plagiarism tool. It gives you more or less unlimited access to its features.

You can add up to 5000 words into its plagiarism checker. It will then analyze your content and give you a report with source links related to the plagiarized content it has detected.

PlagTracker also possesses an impressive database. Your written material will be checked against over 14 billion pages on the web.



Unicheck brands itself as a plagiarism checker for educators and students. It has a database of over 40 billion web pages and educational sites.

Unicheck supports a wide range of formats and bulk uploading of files and is very precise.

It offers totally free plagiarism checking for personal use, and supports a wide range of formats and bulk uploading of files.


prowriting aid pricing

ProWritingAid is widely considered to be one of the best alternatives to Grammarly but also has a great (but premium) plagiarism check tool.

Using its detailed database and the great AI writing assistant that it is, ProWritingAid can identify textual similarities as well.

Plagiarism checking through these amazing tools will save you from much trouble and possible allegations. If you are a blogger or a student, it’s high time you stick to these tools for your plagiarism, editing, and proofreading needs.

Why Use an Online Plagiarism Checker?

There are myriad reasons for using an online plagiarism checker. In today’s world, bloggers and marketers depend highly on this incredible tool. Let’s take a look at some of the benefits that plagiarism checker has to offer.

Instant Results

The online plagiarism checkers work fast and generate results almost instantly. These advanced programs search the entire web within a few seconds, compare your text with the world's content, and instantly highlight duplicate paragraphs or sentences.

Provides references

Plagiarism checkers are particularly useful for students who have to produce academic papers based on solid evidence. When your text matches the original content, you can correctly cite the source and avoid committing the offense of plagiarism.

Saves from possible allegations

These amazing tools greatly help writers to stay within regulatory and ethical limits. Plagiarism is a criminal act, and you may be penalized for committing this offense. Hence, with a plagiarism tool, you can save yourself from possible allegations that may arise from publishing duplicate content.

Helps maintain ranking on Search engines

The search engine operates through web crawlers that crawl through websites to examine the content thoroughly.

Websites with unique and quality content tend to rank higher on search engines. And, if your website is screened using duplicate content, your ranking could be adversely affected. In the worst cases, your website may get delisted by search engines.

Therefore, always run a plagiarism check on your content using plagiarism tools before publishing it on the internet.

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