Hello BlackHatWorld friends, I would like to know if you know any effective tool to detect duplicate content. I'm asking about text (copy a text with X words and detect duplicate content), not an url or something like that. I know 3 tools: 1) Plagiarism Checker 2) Copyscape Plagiarism Checker 3) Plagium But I don`t know what of those tools is better. What do you think about this? Thank you!