From The Blog

Duplicate Content – How to Find it With a Plagiarism Checker

Find duplicate content

How to Check for Duplicate Content with a Plagiarism Checker

Duplicate content is content that already exists in a search engine’s index. At best, the duplicate content will simply be awarded no SEO weight (publish too much and you could face penalties) but at worst, you could be guilty of plagiarism or other intellectual property infringements.

What percentage is considered duplicate?

If you’ve got content on your site that is 90% the same as other content – maybe only the size or colour differs, you’ve got duplicate content issues on your site (see this blog post for how to get around it).  But what percentage of the same wording is considered duplicate?  Some experts say it can be as much as 30% identical to other sites, some say it’s as low as 9%.  If your website is well populated with rich, relevant, valuable content, they you might be able to get away with a higher percentage of duplicated wording on a few pages – the only real answer is to test it and see!

What is the leading plagiarism checker?

Copyscape is the “standard” go to text plagiarism checker. It allows you to test a URL for free or for a few dollars a year, you can test unpublished content. Simply paste content into Copyscape and it will search the web for duplicate copies. You can even load your whole website in and check if anyone is copying off you!  Note though, that if search engines have stopped indexing your internal pages because they violate duplicate content rules, plagiarism checkers might miss them.  To see what’s being indexed on your site, go to the search bar and type  If it’s not in the results, it’s not in the index.

Some duplicate content checkers will also allow you to check your whole site at once without manually entering pages.

Duplicate image testing (known as reverse image search) is a bit harder but the industry leader is probably Tineye. Tineye allows you to upload an image and then search for other instances online. It’s not 100% accurate but is still a handy tool!  Google Image Search is also getting much better at this.

Why would I need a plagiarism checker or reverse image search program?

For more reasons than you might think!

  • If you’re accepting guest blogs or buying articles and want to be sure they’re original
  • If you want to find out if guest blogs you’ve submitted have been published and indexed.
  • To find the source of an image you’d like to use in a post
  • To check if anyone has stolen your images
  • To check if anyone has stolen your articles or copywriting
  • To make sure something you’ve written doesn’t match too closely to a competitor
  • To monitor your intellectual property online

With intellectual property rights in the news, sites like Pinterest leaving you extremely vulnerable to legal issues and search engines constantly updating to penalise duplicate content users, it’s good to know that you are a unique flower in a sea of duplicate weeds 🙂 Using a plagiarism checker is the best way to be sure that your content is original and your rights are protected.