If my understanding is right, what is being asked is if there are any online platforms that can help detect plagiarism. There are a few websites which can do a check in small sections free of cost. Have attached the links below. If you are looking for a plagiarism test that has to be bought, I would recommend Turn It In software which is highly advanced with lot of filters that can be adjusted as required.

https://www.duplichecker.com/

http://plagiarisma.net/

https://www.grammarly.com/plagiarism-checker

It is okay. I mean.  I want to know more about plagiarism. Is there any link with online certification? Thank you.

Oh sorry! I did find something similar to what you are asking. Again have sent the link. Hope it helps.

https://www.indiana.edu/~academy/firstPrinciples/index.html

Thank you

Thank you @ Dibakar Pal Sir,

Is there any online platform to study plagiarism with certification at free of cost?

WR, Dr Surya

Dear @Atanaska Dinkova, Thank you but how can we identify plagiarism? What are the types of plagiarism? How can we avoid plagiarism? I want to study details on this topic. Thank you for your concern.

Hi Surya,

This link may be useful for you:

https://www.plagiarism.org/

Have a great day!

--Adrian