The best and easiest way to identify broken links on your site is by using Google Webmaster Tools. Using Webmaster Tools, you can view errors found by Google while crawling your site. You can then redirect these URLs so that when Google (or a user) lands on this page, they arent lost. This will help you save some lost SEO, help lower your Bounce Rate, and make you look like a SEO super star! As of version 1.1, SEO-Rx will automatically check all external links on your site. Although broken links to other sites do not affect your SEO, it is reported for improving your sites usability.