well we all know the content developed should be unique in nature so that Google when crawls the website will detect the duplicate content and punish the website for it. so its better to check whether the content is duplicate. you can use this tool www.copyscape.com to detect the duplicate content.

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Absolutely, copyscape is the best tool available online to find duplicate content elsewhere on the net which otherwise will be very, very difficult to find. And most of all copyscape is free.

I usually use Google. I don't see the advantage of Copyscape over Google.

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