DupPrevent Plugin helps you to avoid being penalized by Google for duplicate content, generally, WordPress blogs list the same content on main page, on category page, on archive page, and in feeds. Having so much duplicated content might get you penalized by Google and put your content in Supplemental Results index. DupPrevent Plugin controls NOINDEX meta tags to prevent duplicate content penalty. Additionally the plugin includes robots.txt file to disallow search engines to spider feeds, trackbacks and the wp- directories.

Installation:

1. Download DupPrevent.zip, and extract dup-prevent.php and robots.txt to a local folder.
2. Upload dup-prevent.php to wp-content/plugins/ folder.
3. Goto WordPress Plugins panel and activate it.
4. Upload robots.txt to your site’s root directory.

WordPress SEO

WordPress, Prevent Duplicate Content Penalty Plugin