The first method — search engines
The easiest and fastest way to check the content of uniqueness in Yandex or Google. To do this, you just need to copy a couple of lines and insert into the search window. If the results have a site that contains such information, then your article will already be non -native. For insurance, you can check several pieces of text. It is worth considering that whole paragraphs are not suitable for verification. About a hundred characters are enough, otherwise the search may not work.