Plagiarism Checker

To use this Plagiarism Checker, please copy and paste text in the input box below or select a file to upload, and then click on the Check Plagiarism button.

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Check Plagiarism

Prepostseo Plagiarism Checker

Prepostseo is an AI-based plagiarism checker that checks your content for plagiarism by comparing it to billions of online resources.

But, how Prepostseo plagiarism checker is different than others? Any plagiarism checker can compare with billions of resources, right?

The thing is, apart from online resources, it crawls offline databases to check plagiarism in any possible way. Not only that, it compares the text with student submissions and generates a similarity report based on that massive evaluation.

Plagiarism is a serious offense that can turn your reputation around. It is wise to use an online plagiarism detector to get ahead of your competitors, classmates, and colleagues by publishing content that is completely free of plagiarism.

We have developed this plagiarism checker to identify all types of plagiarism i.e.  Incremental plagiarism, patchwork plagiarism, accidental plagiarism and various other types of plagiarism efficiently. It works the same way as Google.

Words Limit For:

Visitors 1000 words
Basic Users 1250 words
Basic Premium Users 5000 words
Standard Premium Users 15000 words
Company Premium Users 25000 words
Organizations / Enterprises Unlimited words

What is plagiarism?

As Wikipedia says,

“Plagiarism is the representation of another author's language, thoughts, ideas, or expressions as one's own original work.”

According to Merriam-Webster,

"To steal and pass off (the ideas or words of another) as one's own : use (another's production) without crediting the source"

For details check plagiarism.org

How does Prepostseo plagiarism detector work?

This plagiarism checker offers a simple interface. Follow the steps below:

  • Copy your text and paste it in the given input box.
  • You can upload a file too. Click on Select File button to upload a document from local storage.
  • If you want to exclude specific URL, click on Exclude URL button and paste the URL in the input box.

  • Select the language to check plagiarism in any other language.

  • Hit the Check Plagiarism button to check the plagiarism.

As soon as you click the button, it will start comparing your content with the resources all over the internet. It is a very robust tool and takes much less time than other tools to complete plagiarism detection. 

Our plagiarism tool provides you the accurate and detailed results after it is done comparing your text with its rich resources. It provides:

  • Percentage of plagiarized content
  • Percentage of unique content
  • Exact phrase match
  • Matched sources
  • Paraphrased match percentage
  • Words count, and
  • Readability


Some of the key features of our duplicate content checker are given below:

1. Upload File to Check Plagiarism

If you do not feel like copying and pasting your text in above input box, you can just upload your file from local storage to check for plagiarism. It offers support of various file types such as doc, docx, pdf, txt, etc.

2. Chrome Extension

Prepostseo plagiarism checker offers a Google Chrome Extension that helps bloggers, web surfers, and webmasters to check for plagiarism. Just select the passage or content you want to check for plagiarism, then right-click and choose the option ‘Check Plagiarism of Selected Text’.

3. Ensured Content Safety

We don’t use your content for any other purposes. Our duplicate content checker just checks the content for plagiarism and never saves your content for any type of further use. Because we know how important are copyrights as we have developed this copyright checker, we don't save others work in any form.

Therefore, the content you check on Prepostseo is 100% safe and secure. you don’t have to worry about the security of your content. We take care of your intellectual property and never do any kind of security breach regarding your content.

4. Plagiarism Reports Generation

Our plagiarism detector provides you the facility to generate and download the plagiarism report. Prepostseo offers reports in HTML and PDF format. Click on the Download Report button to get the full report.

5. Results with sources, highlighted text & Percentage

  1. Sources: Looking for plagiarism checker with sources? Prepostseo got you covered. It gives you matching results and directs you to the original source from where data is taken.
  2. Highlighted text: It highlights the plagiarized text in red color. You can easily check which lines of text are a match and which are original. You can also click on the highlighted text to see the original source of the text.

  3. Percentage: After you get the plagiarism result, it shows the exact matches as well as match in percentage. It is free online plagiarism checker with percentage which makes it convenient to analyze how much your text matches to a certain source.

    Plagiarism checker with percentage

6. Make it Unique 

Our plagiarism checker tool offers a great deal to make your content unique. After checking for plagiarism, click on Make it Unique button.

By using this feature, you can use our paraphrasing tool to paraphrase your content to avoid plagiarism.

7. Deep Search with multiple language support

Prepostseo plagiarism checker uses its own deep search algorithm to check plagiarism by conducting deep web searches all over the internet. It is its own kind of originality checker that goes deep down in databases to compare texts.

By using this plagiarism checker free, you can check plagiarism in multiple languages. You don’t need to worry if your native language is not English.

8. You can also use plagiarism checker for

  • Thesis: Are you a researcher or research assistant? With plagiarism checker, you can check plagiarism of thesis and research paper.
  • Assignments: Need a plagiarism checker for assignments? You can check your assignments for plagiarism using this tool.
  • Code: Developers are writing millions of lines of code daily. To check if somebody is a code that is publically available, Prepostseo is the best online plagiarism check for code.
  • Articles: Are you a blog writer? Find out if your content is original and not matching to the material of anyone else.
  • Books: Need a plagiarism checker for books? Writers and novelists prefer using our tool to identify plagiarism in their work or if anybody is stealing their work.
  • Essays: This plagiarism checker is pretty much intended for essays and blogs. You can find out if you are writing an original idea or unintentionally copying another one.
  • Journals: There was a need of plagiarism checker for journals which our prepostseo has overcome. Now, you can compare your material with millions of journals that are already published all over the internet.

9. Mobile Apps

If you are riding in a bus and heading towards school or office, you can still check your material for plagiarism by using mobile apps of this tool.

You can download mobile app in your phone and check plagiarism anywhere. It offers:

Why it is important to use Plagiarism Checker?

Let’s dive further to know the importance of finding plagiarism.

Search Engine Optimization

The importance of written content on a website is acknowledged to everybody. Without text, a website is like a soulless body. SEO and webmasters are today required to produce quality, unique content to help a website thrive.

This increases the importance of plagiarism checker and if you post content or information on your site that is plagiarized, your website will never get good rankings in SERP.

Academic importance of plagiarism checker

Plagiarism is a violation of academic honesty. It is the rule of intellectual creativity to consider the creative ideas, words and information that form the basis of one's own activities for all the members of the academic community.

As discussed above, copyright or activities of plagiarism can destroy the life of a student. Some institutes can warn students only, whereas other institutions can even expel them.

You can use Prepostseo plagiarism checker before submitting your work to Turnitin. This way, you can be sure that your material does not contain any plagiarized content.

Moral importance

Plagiarism means that an exact idea or product derived from an existing source can become new without the consent of the original creator.

Therefore, before submitting assignments or posting content to website, it is necessary to check it for plagiarism.

Prepostseo plagiarism Detector can be used by


According to a survey by The Josephson Institute Center for Youth Ethics,

59% of high school students admitted cheating on a test during the last year. 34% self-reported doing it more than two times.

That is why, our plagiarism checker is free for students.

Students can use this plagiarism checker to find out if their assignments and submissions are free from plagiarism.


Teachers can use this tool to check if their students are submitting the original work or just copying it from the internet.


Researchers have to publish a lot of material for their research.

They should make sure that their publications and research is original, and they are not accidently publishing plagiarized material.

Content writers & bloggers

Bloggers and content writers publish content on daily basis. Publishing original content is key to higher SEO rankings.

Writers, bloggers, and article writers can use this free plagiarism checker to check the originality of their content.

Colleges & Universities

For Colleges & Universities it is almost impossible to manually compare abundant data throughout the internet. They can save a lot of time by using Prepostseo plagiarism checking tool.



What is a good plagiarism score?

What percentage of plagiarism is acceptable? This question has been asked millions of times. Although, there is no official score for plagiarism but generally, anything less than 15% would be acceptable.


Is it safe to check plagiarism online?

It is totally safe to check plagiarism online using Prepostseo plagiarism checker. We don’t save the content uploaded by users and make sure that it is safe and secure.

How can I check if my paper is plagiarized?

  • Upload your paper using Select file button.
  • Click on the Check Plagiarism button.
  • Your paper will be compared to billions of web pages to check if it is original.


Is there a plagiarism checker for students?

Yes there is. Prepostseo plagiarism checker is a best free plagiarism checker for students to check their assignments, thesis, and submissions for plagiarism.

Other Languages: English, Español, Deutsche, Français, Português, Nederlands, Polskie, čeština, svenska

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Feedback from our users

Prepostseo has 90,000+ happy clients including Webmasters, College Students, University Teachers and Content Writers around the globe. Positive feedbacks from previous customers are enough proof that we have the most accurate Tools.

Well, a lot of online free plagiarism checkers are available but no one provide the accurate report. Those who claim to produce, their reports are either poor or untrustable. As a writer, I have to write100% unique content and need to show the reports to my clients. Prepostseo is the perfect plagiarism report generator that I ever found on the internet. Now I'm stress-free about plagiarism reports.

~ Aimee ~
Writer, freelancer

PPS plagarism checker is best and easiest plagiarism scanner available. I have to check my papers on regular basis because plagiarized assignments are not acceptable. Thanks for your great effort to make this tool free for normal users.
it's the best online Tool i have ever used. Very fast and accurate.

~ Asad Ahsan ~
CEO, xclicx

I was always worried about posting articles to my blog because I was unable to find a premium quality plagiarism analyzer. But I am thankful to the whole team of prepostseo who made this awesome tool.

i think this is the only single tool available on internet that check content deeply.

~ Muddsar Sardar ~
Manager, KRT Solutions