Search Engine Optimization (SEO) is one of the inbound marketing strategies that help you drive organic traffic to a website regularly. You can increase organic website traffic by about 50% after investing in SEO. While implementing an SEO strategy, you must focus on the right on-page and off-page SEO techniques.

Also, you need to identify and fix a slew of SEO issues affecting your website’s search visibility. Plagiarism is one of the critical SEO issues that impact your website’s search visibility and organic traffic directly and negatively. Hence, your SEO strategy must focus on avoiding plagiarism while creating and publishing content.

According to Kent State University,

“In an instructional setting, plagiarism occurs when a writer deliberately uses someone else’s language, ideas, or other original (not common-knowledge) material without acknowledging its source. This definition applies to texts published in print or online, to manuscripts, and to the work of other student writers.”

Major search engines consider plagiarism unethical. Google advises webmasters to avoid plagiarism and duplicate content. Also, Google updates search algorithms to identify and penalize websites guilty of plagiarism. You can easily boost your SEO efforts using a slew of the best free plagiarism checkers. Each of these plagiarism-checking tools or services checks plagiarism by matching your text to the existing online content.

They use algorithms to identify duplicate, copied, and paraphrased content. Also, they highlight similarities in the content using dedicated databases. The widely online plagiarism checkers vary from each other in many aspects, including database size and scanning quality. Some of these best free plagiarism checkers have set word limits for visitors and basic users.

We are making it easier for you to publish fresh and original content by comparing some of the free and popular plagiarism checkers.

Comparing 17 Free Plagiarism Checkers Used Widely by Professional Content Writers

1. Originality.ai

Originality.AI is a new Plagiarism Checker and AI Content Detector that has launched to help digital marketers check the Originality of the content they are publishing. With the rise of AI content tools what Original content means has changed… Originality.AI has been built to be a modern content originality checker. 

What makes Originality.AI unique as a plagiarism checker is that it was built with high-volume publishers in mind. You can add team members to your account and view scan history.

You can check to see if the content was either generated by AI or plagiarized from another source. The easy-to-use tool is priced lower than Copyscape and provides more information. 

2. Copyscape

Copyscape is one of the most popular online plagiarism checker tools. It facilitates the detection of duplicate content and the originality checking of fresh content by providing multiple professional solutions. You can use the free version of Copyscape to check if the content published by you is original simply by entering the URL.

But you have to opt for Copyscape Premium to check content originality before publishing a new article or blog. Likewise, you have to subscribe to Copysentry to check if your website content is being copied and republished on other websites.

3. Small SEO Tools

Small SEO Tools drive search engine optimization and content writing campaigns by providing a set of text tools. You can use the free plagiarism checker provided by Small SEO Tools to check plagiarism and content originality using a deep search. You can check plagiarism simply by pasting your content or entering the URL.

The free plagiarism checker supports multiple languages. The free version of the tool supports content with text lengths of up to 1,000 words. You have to subscribe to the pro version to check the originality of content with text lengths of up to 30,000 words.

4. Quetext

It is one of the plagiarism checkers that protect privacy by not storing documents in a database. Quetext detects plagiarism using deep search technology and produces detailed plagiarism reports in seconds. However, Quetext is not one of the free plagiarism checkers.

You can detect plagiarism in content with text lengths up to 2500 words or 5 pages using the free version of Quetext. The free version of the tool supports conditional scoring and contextual analysis. You need to subscribe to one of the professional versions of the online software after the trial period.

5. ProWritingAid

This artificial intelligence (AI) powered writing assistance comes with several features. In addition to checking grammar and writing style, ProWritingAid comes with a native plagiarism checker. The online tool detects plagiarism by comparing your content with billions of web pages, academic papers, and published content.

Also, it protects privacy ensuring that the content is not stored or shared. You can use this online plagiarism checkers regularly only by subscribing to ProWritingAid based on the number of checks. But you can access this tool free of cost by adding ProWritingAid to Chrome or starting a free trial.

6. Check Plagiarism

This online content originality checker emphasizes speed, accuracy, and security. You can use the free version of Check Plagiarism to check the originality of content with text lengths up to 2000 words. You also have the option to upload a file or paste the content, along with excluding specific URLs during plagiarism checking.

Check Plagiarism displays results by indicating if a particular sentence is unique or plagiarized. Also, it allows you to access the URL matching a specific sentence. However, you have to upgrade to the pro version of Check Plagiarism to generate plagiarism reports more accurately and quickly using deep search technology.

7. Plagiarism Detector

It is one of the plagiarism checkers that is developed as desktop software. You need to download and install Plagiarism Detector on your computer before checking for plagiarism. The demo version of the software is available as a free download.

After being installed on your computer, Plagiarism Detector checks content originality accurately and reliably using search engines. Also, it protects privacy by not storing documents and keeping plagiarism reports private. However, the free version of the software restricts the number of words per document to 1000.

8. Pre Post SEO

You have the option to choose from 95 online tools provided by Pre Post SEO while creating content for digital marketing campaigns. The free plagiarism checker provided by Pre Post SEO allows you to check plagiarism by either uploading a file or copying and pasting the content.

In addition to using deep search technology, the plagiarism checker supports multiple languages. The reports generated by this tool display unique and plagiarized content as percentages. You can use this tool as a visitor to check the originality of content with word lengths up to 1000. Also, you can increase the word length up to 1500 by becoming a basic registered user.

9. PlagTracker

It is one of the free plagiarism checkers that assess the originality of a variety of content. The students and teachers use PlagTracker to detect plagiarism in academic papers, while publishers can use this online service to check the originality of articles and manuscripts before submission.

At the same time, webmasters and SEO professionals can use PlagTracker to know if the content posted on a website is unique or plagiarized. The online tool checks plagiarism using unique checking algorithms and accessing a huge database of academic papers. Also, the plagiarism report generated by PlagTracker highlights the sections that need citations or sources.

10. Dupli Checker

This online plagiarism checker supports multiple languages and file formats. While using Dupli Checker, you can check content originality in a number of ways – copying and pasting the content, uploading the file, and entering the URL. The tool detects both duplicate content and copyright infringements accurately using artificial intelligence (AI) algorithms.

At the same time, Dupli Checker produces reports that highlight duplicate phrases and sentences using a color-coding scheme. However, it restricts the word count to 1000 per search. You have to upgrade to the pro version of Dupli Checker to increase the word count and the number of searches.

11. Writer

In addition to checking plagiarism, Writer helps you improve content quality by identifying spelling, grammatical, and punctuation mistakes. The AI-powered writing assistant assesses content originality by scanning a large database of web pages, news sources, books, and academic papers.

 The AI algorithms produce accurate and reliable results by scanning each word of the content. Also, you can identify the duplicate sections in the article or blog that need citation simply by referring to the text highlighted in the right-hand panel.

12. Unicheck

Unicheck differentiates itself from its competitors by preferring results to numbers. Instead of displaying duplicate content in percentages, it focuses on helping writers increase content authenticity. But its design goal primarily meets the needs of students and teachers. An educational institution can access Unicheck in a variety of ways – as a standalone solution, as part of the LMS, and using an API. But they can use only the demo version of the plagiarism checker without a subscription.

13. PlagiarismDetector.net

It is one of the simple online plagiarism checker tools. While accessing PlagiarismDetector.net, you can check plagiarism simply by pasting your content in a text box or entering an URL. In addition to supporting multiple languages and file formats, this online service checks content originality using deep search technology. The free version of the tool checks content with word lengths up to 1000. You need to access the pro version of the tool to increase the content length up to 25000 words.

14. Plagiarisma

In addition to supporting over 190 languages, Plagiarisma can be accessed on both computers and mobile devices. The online tool allows you to check plagiarism in a number of ways – pasting your text, uploading the file, and entering the URL. However, it checks the originality of the content submitted by unregistered users using Bing.

You have to become a registered user to check plagiarism using Google. Also, you can access a slew of free writing assistant tools by becoming a registered user. Both registered and unregistered users can detect duplicate content based on exact matches.

15. SearchEngineReports.net

As the name suggests, this website helps users boost SEO campaigns by providing a variety of solutions. SearchEngineReports.net facilitates content creation for SEO campaigns by providing an article rewriter and a plagiarism checker. You can paste the text, enter an URL, or upload a file while checking content originality using this online tool.

The tool generates plagiarism reports that display results along with percentages. As it supports 1500 word counts, you can detect plagiarism in an article or blog without splitting the content. Also, you have the option to compare the duplicate content with web pages containing content with similar text.

16. EduBirdie

The online writing platform provides a plagiarism checker that helps students, teachers, and content writers hone their writing skills. You can opt for the for EduBirdie plagiarism checker to check content originality using an AI-driven paraphrasing tool.

The plagiarism report generated by EduBirdie depicts plagiarism by assigning average scores and calculating similarity percentages. Also, it comes with a built-in citation generator that converts duplicate content into quotes automatically. EduBirdie is one of the plagiarism checkers that you can use free of cost.

17. PaperRater

This online service helps you improve your writing skills by availing tools to check grammar, plagiarism, and proofreading. The plagiarism checker provided by PaperRater is hugely popular with students and academics. You can consider this tool to check content originality by comparing your text to more than 10 million documents.

The basic version of the cloud-based software allows you to get 50 submissions per month without subscriptions. But you need to subscribe to the premium version of the online solution to increase the monthly submission up to 200.

18. Grammarly

The plagiarism checker provided by Grammarly helps you check content originality and fix writing issues simultaneously. Grammarly plagiarism checker checks plagiarism by comparing your text to over 16 billion web pages. While using this online tool, you can check content originality by pasting your text or uploading the file.

The free version of the tool depicts if the text written by you contains duplicate content or not. You have to subscribe to the pro version of the plagiarism checker to identify the passages that contain duplicate content and need citations.

19. ZeroGPT

ZeroGPT is a simple and credible tool to detect AI-written content. It is being used and trusted by millions every month.

After analyzing more than 10M articles and text, some generated by AI and others written by humans, we developed ZeroGPT’s algorithm with an accuracy rate of text detection higher than 98%. Our AI text detector tool uses DeepAnalyse™ Technology to identify the origin of your text. It is based on a complex mathematical equation, as well as a trained in-house model which makes ZeroGPT the most accurate tool available on the market.

Their experiments are still ongoing, and their aim is to analyze more than 1B articles and text and to converge to an error rate lower than 1%.

ZeroGPT has worldwide usage with multilingual users. It detects AI text output in all the available languages.

And the most important thing, ZeroGPT is completely Free to use. Also, Now ZeroGPT is offering a Gauge showing the percentage of AI written content, and also ZeroGPT highlights the sentences that are written by AI.

Conclusion

You can avoid duplicate content and boost SEO efforts using a slew of the best free plagiarism checkers. But you must remember that most of these plagiarism checkers are available in both free and professional editions. The professional or premium versions of the tools always detect plagiarism more accurately and give actionable recommendations.

Hence, you should spend some time evaluating the quality of reports generated by each of these free plagiarism checkers. It is also a great idea to check content originality more accurately using multiple plagiarism checkers. The comparison and evaluation will help you the right plagiarism checker for your SEO writing and content marketing project.