Top 11 Best Online Plagiarism Checker Tools And Websites (2021 Updated)

Best Free and paid Plagiarism Checker Tools 2021. These applications scan the internet for other copies of content or documents.
After introducing the Google Panda algorithm blogger become careful about posting. Because the major intention of Panda to detect duplicate content and give a penalty to those sites. 

Every day we make a post but we are creating duplicate content intentionally or accidentally. 

So we should check the content before publishing. Beside of this those blog who accept Guest Post, they should also aware of duplicate content even I often receive many guest post which has copied from other website or blog.

11 Best Free Online Plagiarism Checker Tools Compared

Eventually, you may be the victim by publishing duplicate content from Guest writer by Google Panda Penalty. So blogger should check whether the content is published before or not.

However, it may seem to you that this is very hard to find out duplicate content, but you can easily do it with the help of duplicate content checker online tools which are absolutely free.

1. Writer’s plagiarism checker

Writer’s plagiarism checker is a free, AI-powered tool that is purpose-built to make you a better writer. Its intuitive technology ensures that your work is free from plagiarism, grammatical errors, and contradictions in tone and voice. 

10+ Best Online Plagiarism Checker Tools In (2020) Free & Paid

The writer provides this tool for free in all web browsers and can be integrated with dozens of popular applications. It’s so simple to use, every copywriter should run their work quickly through this tool to perfect their content before submission.


This is the most popular plagiarism checker tool known by beginner to professional blogger. Currently, this is providing free and paid service. With this tool, you can check the duplicate content which is already published. 

3. Article Checker

It’s a free plagiarism detection tool that helps you to find copied content. Under this service, you will find a very dull design on this site that doesn't attract visitors. But it has a good feature that you can select Google and Yahoo Search engine to find duplicate content.



This is a new service provider under the plagiarism checker service. This is also provided free and paid version. Under free version I found the result is not fully accurate but if you want to use the paid version you can use a 7-day free trial to judge it. 

5. Paper Rater

Through this service you will be able to check duplicate content. This is giving accurate information and you will find some other free service with plagiarism check. Besides this, you can check Grammar and Spelling as well as proofreading.

  • Site Address: Paper Rater                       

6. Duplichecker

From my point of view, this is the best plagiarism checker tool over the net. I often use it to find duplicate content. Because you can directly check the written article rather than placing a post URL and it is absolutely free. 

You can check up to 1500 words article, however, I found the accurate result from Duplichecker.

  • Site Address: Duplichecker                               

7. Plagiarisma

This is also the most popular and reliable plagiarism checker a tool where you can use this service absolutely free and you will be able to check URL as well as a written article. 

It supports more than 190 languages. And check content from almost all popular search engine. Such as Google, Babylon and Yahoo, but to use Google you have to register with them.


8. Plag Tracker

Through this plagiarism checker tool, you can find out part by part copied content which is very good. And it is providing a free service with accurate information. You can trust them to find duplicate content. It has categorized its service for Students, Teachers, Publishers and Site owners.

Plag tracker

9. Plagium

Plagium is a powerful plagiarism checker tool where you can check a big article up to 25000 characters. This service is totally free. And it searches duplicate content through the web, news, social networks.

10. Plagiarism checker

The main feature if this tool you can add a Google alert where if any person republished your content then Google will send you an email alert. This is also provided free service.

11. Siteliner

Recently it is providing beta service. But the result after the plagiarism check is not 100% accurate. But expecting it will improve soon. Not only you will find duplicate content but also it will find broken links, XML sitemap, internal page rank and many more.

site liner 

Hope this article will help you to find duplicate content easily. If you feel doubt about one service provider then go for another one and then compare the result. 

If you know more site beside the above list then kindly share with us.
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