Post: Discover the Top Tools for Detecting Duplicate Content in SEO


Duplicate content is a major concern for website owners, as it can negatively impact your site’s search engine optimization (SEO). Identical content appearing on multiple pages of your own site or on third-party sites can result in lower search rankings and lost traffic. In this article, we will reveal some of the best tools to help you detect duplicate content both internally and externally.

Identifying Internal Duplicate Content

One of the first steps in combating duplicate content issues is to identify any problems within your own site. There are several fantastic tools available that can scan your website to detect identical or closely related content.

  • Siteliner: This tool allows you to enter your website’s URL and generates a comprehensive report highlighting duplicate content per page. It includes matching percentages, the number of matching words, and the page’s power. By clicking on a specific URL, you can view your webpage with duplicated text highlighted in various colors, making it easy to identify and rectify the issue.
  • Copyscape: Another popular option for detecting internal duplicate content, Copyscape scans your entire site and provides detailed reports on any instances of copied content. You can also exclude specific sections of your site from the analysis by selecting them by tag, class, or ID.

Finding External Duplicate Content

Another critical area to address when dealing with duplicate content is locating instances where other websites have copied or repurposed your unique content. The following tools can prove invaluable in identifying external duplicates:

Kill Duplicate

Kill Duplicate is a paid French tool designed by Paul Sanchez, an experienced SEO consultant. This powerful tool scans the internet for instances of external duplication, providing information such as percentage of copied content, the HTTP status of the page, and SERP (Search Engine Results Page) positions. It even includes a “solution” button which offers various strategies for solving duplicate content issues. Subscription plans range from 19 euros to 399 euros depending on your needs.


Similar to Kill Duplicate, PlagiarismDetector allows you to test up to 1000 words of content for duplication in its free version. This tool is slightly more accurate and provides the top ten most probable results, showcasing pages that contain duplicated content with common areas highlighted. Additionally, it provides a summary indicating the number of words and the percentage of duplication.


Copyleaks, available in both free and pro versions, can detect real-time duplicate content across the web. The free version allows you to check up to 10 pages while the upgraded edition enables you to insert your site and automate the detection process.


Quetext utilizes its proprietary DeepSearch technology to perform contextual analysis by considering the statistical likelihood of each word and phrase within the surrounding context. This tool offers a free tier that allows users to analyze up to 2500 words per month, which can be beneficial for small-scale content creators.

Duplicate content poses a significant challenge for website owners seeking to optimize their sites for search engines. Thankfully, there are numerous tools designed to help identify and resolve these troublesome issues. By leveraging the power of Siteliner, Copyscape, Kill Duplicate, PlagiarismDetector, Copyleaks, and Quetext, you’ll be able to take control of your site’s content, reduce instances of duplication, and improve your search engine rankings.

In conclusion, it’s essential to stay informed about the latest news in SEO, including developments in duplicate content detection. Proactively leveraging these tools will significantly improve your site’s performance, ensuring your original content receives the attention it deserves.