Free Online 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

Online Plagiarism Checker

Prepostseo Online Plagiarism Checker is widely used to check the original content. You can detect plagiarism by just copy-pasting the content or by uploading files. Using Plagiarism Detector is essential for protecting your content as duplicate content is not acceptable by Google. Plagiarized content can harm your website and down your ranking in search engines.


Generate Reports: Generate reposts at and share it with your colleagues.

Upload Files: Check Plagiarism by directly uploading .DOC / .TXT / DOCX / .PDF files.

100% Safe & Secure: Any article you check at is 100% Safe & Secure. we do not save your content.

Keywords Density: Check keywords density in your content, by one word, two words and three words.

Grammar Checker: Check spell mistakes and also errors in your writing styles and in your grammar.

Compare Text: Compare full text with any matched sources. You can also compare each sentence separately.

100% Free Tool We were planning to make this Tool totally free and now we made it! You can check plagiarism free with unlimited searches.

The only limit is on the total number of words per search. For free users, this limit is 1,000 words and it could be increased up to 5,000 words with any premium plan. If you are not sure how much words your documents have, you can use prepostseo word count tool to calculate the total number of words and characters.

How to check for plagiarism?

No rocket science involved in checking plagiarism. All you have to do is, paste your content that you want to check for plagiarism and click on the "Check Plagiarism" button. Now let our online scan tool handle the rest of the things.

Understand the results:

When you will paste your content into the input box, our tool will parse your full article into small sentences of 7-10 words. After parsing sentences, it will start checking plagiarism for every sentence and will display results in real time in front of you. We aim to provide the best anti-plagiarism report for your content.

We respect our user's privacy. Any article you check at is 100% safe and secure. we do not share any of your content publicly. Also, we do not save your content in our database.

How does our tool check plagiarism?

First Step: The text you enter is scanned sentence by sentence on the search engines i.e., Google, Bing, Yahoo, Yandex, etc. There will be two types of results:

  1. If the sentence that checked already exists on the internet, a red alert will appear and the content will be labeled as plagiarized.
  2. If your content is unique, a green alert will appear against that sentence. After a full scan, an overall result will show the uniqueness of the article.

Second Step:

Keywords Density: Our plagiarism checker tool Calculate the keywords density of your content and give results for one word, two words, and three words long keyword density.

You can also check our Prepostseo keyword density checker tool for the detailed results.

What is Plagiarism?

It is defined as "the process of copying the data from the internet or getting someone’s idea and then sharing it as your own data is called plagiarism."

It is a highly undesirable practice and is considered as a fraud as it involves immoral activities of stealing the data or idea and then lying about it. Because of this cheating activity, many software has been launched to detect plagiarism. The main purpose of using plagiarism checker is to scan the cases of the copied data. The online duplicate content checker not only checks the stolen cases of data but it also tells the sources of that stolen data.

Prepostseo plagiarism checker is specially designed for students, writers, teacher, and webmasters to check papers, assignments, essays, thesis, and articles. It is the best online text checker for students and webmasters and for educational institutes. With our anti-plagiarism software, you can generate online reports and share it (all reports are 100% secure, only you can view those reports). Multiple universities and colleges named our duplicate content tool as "best free plagiarism checker online".

We at Prepostseo developed this online detector for writers to find originality in their articles to avoid their content to be plagiarized. To make this online copy checker fast, we tried every method to improve the user experience. This Online Software not only scans plagiarized content percentage but it also shows you the grammar and spells mistakes in your essay, article or assignment. If you want to compare two documents for plagiarism you can use our plagiarism comparison tool.

How to avoid Plagiarism?

If you are a student, writer or an author of a magazine you will definitely like to submit 100% unique articles. Some plagiarism tools check your content once and display you the overall result for your assignment or whatever you submitted to check plagiarism. But Prepostseo online plagiarism checker is free to use and it checks your essay sentence wise and goes through each and every word.

We do not only entertain written plagiarism. For checking image plagiarism, you can use the reverse image search tool. Reverse image search helps to check copied pictures and add proper sources to prevent image plagiarism.

If you want to avoid plagiarism for content, there are a lot of ways to make your content 100% unique and usable. Secondly do not try to re-write content by using online re-writers because those tools might help you to give you original content but they can ruin content grammar, spell and writing style.

To combat this problem, we have developed highly efficient article rewriter. Our article rewriter does not only produce original content, but it also keeps your file grammar error free.

What other parameters do we show to make the content better?

Checking plagiarism is not enough before submitting your article on search engines for crawling and ranking. We take care of the rest of the parameters that can be tested by spiders of Google. For example, we do keep an eye on keyword density, grammatical and spell mistakes in your paper.

We have developed a grammar checker tool for the same purpose for those who wish to check grammar errors in their article.

Who can use Prepostseo plagiarism scanner?

It is used by students to check the papers or assignments and make it original by deleting all the plagiarized phrases. Similarly, teachers also use diff checker to compare the text of the papers and assignments. SEO specialists are using this tool to check their hired freelancers as they need 100% unique content from them. Publishing the duplicated data is a big crime and in order to minimize this risk, almost each and every website uses this tool before publishing the content.

This software usually contains a box where you can copy paste the lines or paragraphs which you want to check for plagiarism. All the plagiarized lines and paragraphs will be highlighted in red color and the percentage of highlighted data will also be given.

When the process of searching your content from search engines finished, you can generate reports to share it with your teacher, author or with your writer.

Check plagiarism for each article you post

Some bloggers think that we can rank on Google search engine with a mixture of plagiarized content and unique content. That’s not possible. According to new algorithms, Google treats each web page differently. It means the page having quality content will be rank and the content that is not passed with plagiarism checker will not rank in the search results. Is it tough for you to create unique content for your blog/website, right? you can use our article rewriter or paraphrasing tool to generate new articles quickly.

What Is Coming Next?

We are developing a separate tool that will help universities and colleges to embed this online software to their student’s portals or on their educational websites.

If you have any suggestions regarding our plagiarism checking tool, you are welcome to contact us.

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

User Rating

4.8 / 5
(33 Reviews)

5 Stars - by , June 21, 2019
nice tool

4 Stars - by , May 29, 2019
some times documents not uploaded..

5 Stars - by , May 29, 2019
amazing website.

5 Stars - by , May 29, 2019
A useful tool for plagia checking and the grammar checking as well ... Well done to those who creates this amazing tool ...
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