Try CopyScape.
 
most use copy scape .... but there are several tools. no clue which is 100% correct ...
 
Copyscape plus also manually check via the search engine.
These types of tools won't detect any changes to Unicode.
 
want the best result - try the paid service
do not want to buy it
try 4 of the most popular service for same content again and again.
 
If you rewrite PLR content and want to check the uniqueness percentage, then you can use this tool:
http://thebestspinner.com/compare

Otherwise, if you want to check your articles if it is being copied elsewhere on the internet, you can use copyscape.
You can also enter your sentence on Google search by including quotes and then search.

example.png
 
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There are many online tools for this purpose, Few of them are Plagiarism Checker and
Siteliner
 
Some people are mistaking Google search bar for "Post a new thread - title".
 
I tried CopyScape. It's really helpful tool. You can try it. Make sure the contents which you are going to post on your website has passed the copyscape because copied contents can have the legal action.
 
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