How much duplicate content is acceptable

Duplicate content checker

Duplicate Content Checker: Brief explanation

Just copying someone off is not the right thing to do. Whether students are doing their class work or politicians doing their dissertation, it is simply not socially acceptable to adorn oneself with plagiarism with foreign feathers. It is no different on the Internet - however, it is particularly easy to copy content here. On the other hand, it is often very difficult for the cheated to check whether someone has used the content on their website. Fortunately, there are duplicate content checkers for this purpose that help track down plagiarism on the Internet.

Detailed explanation:

Plagiarism can become a serious problem for the operator of a website - regardless of whether others copy his content or he - unknowingly - uses texts that are not original and therefore not unique content. Because for Google and other search engines it is very important that a website only uses unique content. If Google discovers that a page is using copied content, it will be penalized in the ranking and will slide down in the SERPs - a decisive disadvantage in competition with other website operators. A duplicate content checker is therefore absolutely recommendable from an SEO and online marketing perspective. In addition, such software can help if there is a dispute over the authorship of content.

For example, if a company invests a large amount in optimizing its website in order to improve its ranking, it would be more than annoying if it did not succeed. This can also happen through mistakes in SEO, but also because others use the foreign content. The company can now either accept this - also legally relevant - violation or try to defend itself. In the latter case, however, the company faces the next problem: it has to prove that its own content is the original.

This problem can be solved quite easily with a duplicate content checker, because some versions of this software keep the results of the plagiarism check permanently available. Having your own content checked as soon as you upload it ensures, on the one hand, that you do not inadvertently use third-party texts. On the other hand, you can easily prove when the content was put online - and thus show that it is the original and not the content of the competition.

How does a duplicate content checker work?

Basically, plagiarism checking software doesn't work much differently than search engines like Google. It uses certain passages of a text or the entire text and compares this content with the content available on the Internet. As a rule, duplicate content checkers use the Google index. If a match is found, the software returns the URL of the page where the content can be found. It also shows which passages are duplicated.

In addition, the functions available depend on the software used. Many duplicate content checkers allow, for example, to specify the length of the passages from which the software should start. It often makes sense to experiment a little here, because the checker shouldn't even hit the smallest match, but it shouldn't be too "generous" either, since otherwise even very clear plagiarism will not be recognized. The offers available on the market also differ in terms of inspection intervals and the documentation of the inspection. For example, there are duplicate content checkers that check content regularly and automatically, while others only do this once and have to be started manually. Before you decide on one of the offers, you should definitely find out about the range of functions and of course the costs.

The limits of a duplicate content checker

Software for plagiarism checking should give the user the security that he is not using any third-party content and that nobody is using his content. If you look at how a duplicate content checker works, you might think that such software reliably protects against plagiarism - and this impression is reinforced by many of the software providers.
Unfortunately, this impression is wrong. This is not least due to the heuristics that are used to detect plagiarism. Here the user or the provider has to make a trade-off. If the software hits too often, it is difficult to use. After all, who has the time to deal with several dozen or even hundreds of possible plagiarism cases a day? If the software checks too imprecisely, however, plagiarism can remain undetected. This would result in a poorer ranking, and expensive SEO and marketing measures could fizzle out ineffectively.

In addition, most duplicate content checkers have a fundamental problem: they use Google's index to find copied text. This covers a large number of pages, but Google does not include all available websites in its index by far. If a page has not been indexed, it will also fall out of the plagiarism check.

A duplicate content checker is therefore a useful measure to prevent your own content from being copied. However, such software cannot offer complete protection either - one should be aware of that.

Which duplicate content checkers are there?

As in most other software areas, the range of duplicate content checkers is immense and difficult to oversee at first glance. The following tools are some of the most famous and popular available in the market:

  • Copyscape: This software is probably the most widely used on the internet, and not without reason. Operation is very easy and the algorithms for plagiarism detection work very reliably. If larger amounts of pages are to be checked for unique or duplicate content, a premium version is available for a fee. The tool can also send notifications if copied content is found during an automatic check.
  • This tool can not only check websites for duplicate content, but also individual texts that are simply copied into the appropriate window. One advantage over Copyscape are the numerous setting options that the program offers. The disadvantage, however, is that the algorithm for the plagiarism check does not work quite as reliably as with Copyscape.
  • Plagium: This tool is chargeable, but offers a second search method that is more expensive, but also much more thorough. In addition, the user can decide whether the entire Internet should be searched or whether he wants to limit the search to media portals or social media pages. Shorter texts of up to 5,000 characters can be checked free of charge with this tool.
  • Copygator: This software is primarily aimed at blog operators, because it does not look for copied content on the Internet, but in RSS feeds. If plagiarism is discovered during a check, the tool automatically informs the user of this with a message.


A duplicate content checker cannot offer absolute protection against plagiarism, but such software is recommended. Copied content is recognized very reliably overall. In addition, a corresponding tool can provide evidence of when your own content was uploaded - and thus show what the original and what the copy is. In addition, a Duplicate Content Checker can be used to prevent SEO measures from becoming void due to copied content.


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