You need a plagiarism checker with a percentage
You need a plagiarism checker with a percentage, because you need to know exactly which parts of the document are plagiarized. Sometimes a quote can be a deliberate form of plagism; sometimes your website’s CMS has some default text in the footer or comment section. You need to know exactly what percentage is duplicate content that is indexed elsewhere.
Google ‘plagiarism checker’ and you will find a dozen sites listed as the ‘best plagiarism checker’ or even ‘best free plagiarism checker’. Mostly created for students, a plagiarism detector will scan through your text and perform a free plagiarism detection check for unique content. The plagiarism checker percentage that appears will reveal how much of the text has been directly lifted from its database of internet resources, past academic work and published journals.