Scraped, plagiarized, and duplicated content can create unnecessary SERP competition and drive traffic away from your pages. Below, we teach you about Google\u2019s duplicate filtering system, its shortcomings, and what you can do to protect yourself from SEO plagiarism.<\/p>\n\n\n\n
Key Takeaways<\/strong><\/p>\n\n\n\n <\/p>\n\n\n\n <\/p>\n\n\n\n <\/p>\n\n\n\n SEO plagiarism<\/a> is the practice of copying existing content from other websites without permission to skew search rankings.<\/p>\n\n\n\n In contrast, duplicate content is when substantially similar or identical pieces of content appear across multiple domains. In the latter, duplication typically occurs with the original author\u2019s consent.<\/p>\n\n\n\n However, both can hurt SEO rankings. Here\u2019s how:<\/p>\n\n\n\n Though Google tries to select one version of duplicated copy to surface as the canonical version<\/a>, its methods aren\u2019t perfect.<\/p>\n\n\n\n Sometimes, it may also:<\/p>\n\n\n\n Because of these inconsistencies, SEO plagiarism and duplicate content can still affect search rankings. Internal duplicates can split ranking signals across multiple URLs.<\/p>\n\n\n\n Meanwhile, external duplicates or scraped copies can sometimes compete with the original page if Google misidentifies the canonical or the original source.<\/p>\n\n\n\n To measure the consistency of Google’s deduplication system, we searched Google for 10 real estate keywords and counted how often duplicate pages appeared in the search results.<\/p>\n\n\n\n Here\u2019s a step-by-step rundown of how we conducted the study:<\/p>\n\n\n\n We found that duplicate listings appeared in all 10 search results<\/strong>.<\/p>\n\n\n\n While Google attempted to filter duplicate listings twice, it still displayed more than five duplicate listings in both instances. <\/p>\n\n\n\n Because Google does not consistently filter duplicate content, you may not realize that your rankings have already suffered. Here are a few more of our observations related to duplicate content, SEO plagiarism, and ranking. <\/p>\n\n\n\n Publishing the same content across multiple websites forces Google to choose one version to rank highest. This means that syndicated versions placed on more authoritative domains may occupy higher rankings, redirecting traffic from the original page.<\/p>\n\n\n\n This occurred frequently in our study. For 5 of the 10 keywords, Zillow claimed the top result instead of the broker’s own website. While this can help brokers reach valuable leads, it also reduces opportunities for the original page to earn ranking signals. <\/p>\n\n\n\n Canonical tags are signals, not directives. Even with canonical tags in place, Google will still consider other ranking and canonicalization signals when selecting which versions of syndicated content to show in search results.<\/p>\n\n\n\n In our study, most top-ranking pages came from authoritative domains, such as Zillow, Redfin, and Apartments.com.<\/p>\n\n\n\n While internal templates keep your pages consistent, they don’t make your content unique. If multiple pages use the same template and nearly identical text, Google may view them as duplicates.<\/p>\n\n\n\n To help your target page rank, add original copy that gives readers information they cannot find on your other pages.<\/p>\n\n\n\n From Google\u2019s perspective, scraped content behaves similarly to syndicated content. It registers substantially similar pages as duplicates whether republished with permission or copied without it.<\/p>\n\n\n\n This means that when it decides which version to rank, duplicate content can still compete for the same keywords.\u00a0<\/p>\n\n\n\n Whether the content was republished with permission or copied without it, Google sees multiple versions of the same page.<\/p>\n\n\n\n While SEO plagiarism and other types of duplicate content can harm rankings, they\u2019re relatively easy to find and get rid of. Here\u2019s our step-by-step guide to flagging and preventing duplicate content. <\/p>\n\n\n\n Site crawlers like Screaming Frog or Siteliner can help you identify pages inwith substantially similar content. Find the pages that repeat copy or rely on the same templates and rewrite them to include unique information relevant to the keywords your page is specifically targeting. <\/p>\n\n\n\n To flag duplicate content on other pages or websites, you can identify a distinctive phrase or sentence from your page and search for it in quotation marks, similar to how we did in the study. Google will return pages that match the exact phrase or sentence. <\/p>\n\n\n\n If two pages serve the same purpose, it\u2019s best to use a 301 redirect to consolidate them. <\/p>\n\n\n\n If both pages need to remain live, you can use a canonical tag to tell Google which page you want to treat as the primary page. However, there is no guarantee that Google will follow the signal, which is why 301 redirects are usually the best option. l<\/p>\n\n\n\n If another website republishes your content without permission, ask the site owner to remove it. If they refuse or do not respond, you can submit a DMCA takedown request to have the copied content removed from search results where applicable.<\/p>\n\n\n\n Plagiarism is the act of copying someone else\u2019s work without permission or attribution. Meanwhile, duplicate content is publishing identical or substantially similar pieces of content across multiple domains.<\/p>\n\n<\/div>\n<\/div>\n Typically, no. While self-plagiarism<\/a> refers to the practice of reusing past works without disclosure, it is only problematic in settings that require original authorship, such as academia, publishing, research, and competitions.<\/p>\n Most duplicate content online simply exists to improve usability, support multiple versions of a page, or make content available across different URLs.<\/p>\n\n<\/div>\n<\/div>\n Not always. Google says it may choose one version of duplicate content to show prominently in search results. However, our study found that 8 out of 10 duplicate pages were not filtered.<\/p>\n\n<\/div>\n<\/div>\n Search a distinctive sentence from your page in quotation marks to identify copies in Google Search. For ongoing monitoring, use a dedicated plagiarism or duplicate content checker, such as Screaming Frog or Siteliner\u2019s plagiarism checker.<\/p>\n These tools can help you find duplicate content across the web and monitor your site for copied pages.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n Don\u2019t assume that Google\u2019s deduplication system will protect you from scraped or duplicated content. As our study showed, Google\u2019s track record for filtering copies is unreliable. Protect your rankings by proactively searching for duplicate content and crafting replacements that are unique, value-adding, and relevant to your keyword.<\/p>\n\n\n\n For more SEO tips, check out our\u00a0 SEO basics checklist<\/a>. It provides a comprehensive rundown on how to improve your search rankings.<\/p>\n\n\n\n\n
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\n\n\n\nSEO Plagiarism vs. Duplicate Content: What’s the Real Difference<\/h2>\n\n\n\n
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Does Google Always Filter Duplicates?<\/h2>\n\n\n\n
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We Searched 10 Duplicate Listing Phrases on Google \u2014 Here’s What We Found<\/h2>\n\n\n\n
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What This Means for Your Site’s Duplicate Content Risk<\/h2>\n\n\n\n
Syndicated content can still compete (or cannibalize) in the SERP <\/h3>\n\n\n\n
Canonical tags are not directives<\/h3>\n\n\n\n
Internal templates are not a substitute for unique copy<\/h3>\n\n\n\n
Scraped or copied content from your site behaves the same way in reverse<\/h3>\n\n\n\n
How to Identify and Prevent Duplicate Content, Step by Step<\/h2>\n\n\n\n
Run a Screaming Frog or Siteliner crawl to flag internal near-duplicates and boilerplate<\/h3>\n\n\n\n
Spot-check your most valuable pages with an exact-phrase Google search <\/h3>\n\n\n\n
Set canonical tags and 301s for any confirmed internal duplicates<\/h3>\n\n\n\n
Request removal or DMCA action for external scraped copies<\/h3>\n\n\n\n
Frequently Asked Questions<\/h2>\n\n\n
Is SEO plagiarism the same as duplicate content?<\/h3>\n
Does duplicate content count as self-plagiarism?<\/h3>\n
Does Google penalize duplicate content automatically?<\/h3>\n
How can I check if my content has been duplicated elsewhere?<\/h3>\n
Final Thoughts<\/h2>\n\n\n\n