The article you entered is scanned carefully, and so is the world wide web. It’s very likely you’ll see some red in your results as common phrases may trigger red flags. If there are complete sentences that aren’t original, this tool will identify the original source of any unoriginal or plagiarized content that was copied from the internet.

Understanding the results:

Phrases or sentences shown in red already exist online and will not pass Google plagiarism tests.

They are also links… feel free to click on any red lines and see the original source for your records. When the test is done, you’ll also be given an exact percentage that tells you how original or unique your article is.

Duplicated content results in a lower page rank. If you publish an article or web page content that is not entirely unique and original, there is a significantly higher risk of being blacklisted by Google and other search engines. So, if your goal is to have a higher page rank– and search engine results placement (SERP) — then it’s simply not worth the risk of publishing heavily duplicated content. Right?

While this free plagiarism checker may be used for checking rewritten or spun content to eliminate consistencies (and raise the unique value of each article) its benefits aren’t restricted to black and gray hat seo domains and techniques. In fact, a great blog here on white hat seo and serp checker  specialists rely on this free plagiarism checker to make darn sure their freelance writers are submitting work that is 100% original and unique.

You can check content from your own website to make sure nobody else has been ripping you off!” Source: Small SEO tools