My Google webmaster tool account display i have a 32 duplicate title tags. Most of the issues are the mobile site and desktop site URL's. I use blogger platform, so its desktop URL's ends with ".html" and mobile URL's ends with ".html?m=0", mobile version desktop version site URLs are ".html?m=1". If someone need to load desktop version on their mobile device its URL like this ".html?m=1". So now Google webmaster show there are duplicate title tags on ".html?m=1" URL's. For example Mobile device desktop version URL:- http://www.mydomainname.com/2012/06/post-one.html?m=1 Desktop URL:- http://www.mydomainname.com/2012/06/post-one.html So i think best way to fix it using canonical tags. How do i use canonical tags. Is this method correct? In this way <link href='http://www.mydomainname.com/2012/06/post-one.html?m=1' rel='canonical'/> <link href='http://www.mydomainname.com/2012/06/post-two.html?m=1' rel='canonical'/> <link href='http://www.mydomainname.com/2012/06/post-three.html?m=1' rel='canonical'/> OR in this way. <link href='http://www.mydomainname.com/2012/06/post-one.html' rel='canonical'/> <link href='http://www.mydomainname.com/2012/06/post-two.html' rel='canonical'/> <link href='http://www.mydomainname.com/2012/06/post-three.html' rel='canonical'/> Thanks!