[MaryOlson]

    Guys give me some suggestions on how to check duplicate contents, i am interested in knowing!

    Thanks a millions in advance...

    Best Regards

[Non-SEO]

 There are some online tools for checking it. You can google it or baidu it.

[juicebrenner]

I like to use copyscape. Of course there are many others that can be found online too.

[truongduong201]

find it and what will you do ? in webmaster tool, i find to many duplicate content, but i can't remove it, if you know how can remove duplicate pls share it 

[Gay]

 Hehe, Vietnamese friend  How is it possible?! You can just delete your duplicate content and it will remove it. What's the problem?

[Docia24]

We keep hearing about website internal duplicate content issues but many of us are sincerely unaware of the fact that that’s what our own website also suffers from. Why?
most of the websites are made with the help of third-party site creators that create duplicate URLs to same content and we don’t know about that;
sometimes webmasters just lack SEO knowledge. For example, they might be unaware of the fact that URLs are case sensitive and www.yoursite.com/page1 and www.yoursite.com/Page1 are handled as two different pages with the same content.

Now what can create duplicate content:
canonical issues (www and non-www version);
pagination when different pages have identical titles and meta description;
various versions of the home page (e.g. www.site.com and www.site.com/index.php);
incorrect internal navigation creating several URLs to one and the same page (e.g. www.site.com/page.php?id=567 and www.site/category/page.php?id=567); etc
Why is it important to get rid of duplicate content issues?
Google has mostly figured how to sort this out. It will drop one version and index and rank another one. But still internal content duplication may result in a few issues:
decreased crawl rate as Googlebot is kept busy crawling unnecessary identical pages;
a wrong version of the page ranked which results in bad user experience (e.g page 2 is ranked instead of page 1);
delayed ranking of newly launched sites.

[electra]

The actual steps used in handling duplicate contents on your websites depends on the platform you are using. Duplicate content is impossible to avoid if you are using a content management system. What you do as a webmaster is to block them from being indexed by search engines to prevent your websites being penalized for duplicate contents.

[appdeveloper]

I think about that you can use virante.com to check duplicate content of a site.

[Richard Smith]

 Hello,

In my opinion there are many tools available on the internet. You can use copy scape tool and easily check which content is duplicate.

Thanks and Regards
 Richard Smith

[SEO]

appdeveloper and Richard Smith, you're ones of the most responsible and true SEOers I ever met. Thank you so much for your participation here and wish you a lot of SEO success ! 

 RESPECT ! ! !

[leonardw]

There are several online SEO tools  are available to check content duplicacy. Copyscape Plagiarism Checker is one of my favorite to check duplicate content.

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[thepainter]

I check duplicate contents via copyscape.com. It is a free online tool to check duplicate content. You have to simple insert the url and proceed. It displays you whether the content is been plagiarised or not.

[android45]

Google it you will find lot of tool for checking duplicate content.

[krishsmiths]

There are so many online free tools available for check duplicate contents. You need to just use it and check it for your purpose.

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[appleer]

We keep hearing about website internal duplicate content issues but many of us are sincerely unaware of the fact that that’s what our own website also suffers from. Why?
most of the websites are made with the help of third-party site creators that create duplicate URLs to same content and we don’t know about that;
sometimes webmasters just lack SEO knowledge. For example, they might be unaware of the fact that URLs are case sensitive and www.yoursite.com/page1 and www.yoursite.com/Page1 are handled as two different pages with the same content.

Now what can create duplicate content:
canonical issues (www and non-www version);
pagination when different pages have identical titles and meta description;
various versions of the home page (e.g. www.site.com and www.site.com/index.php);
incorrect internal navigation creating several URLs to one and the same page (e.g. www.site.com/page.php?id=567 and www.site/category/page.php?id=567); etc
Why is it important to get rid of duplicate content issues?
Google has mostly figured how to sort this out. It will drop one version and index and rank another one. But still internal content duplication may result in a few issues:
decreased crawl rate as Googlebot is kept busy crawling unnecessary identical pages;
a wrong version of the page ranked which results in bad user experience (e.g page 2 is ranked instead of page 1);
delayed ranking of newly launched sites.

That is great!! sometimes we should to learn how to make canonical url when there are different url and the content is the same !