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Google Webmaster Tools is a no-charge web service by Google for webmasters. It allows webmasters to check indexing status and optimize visibility of their websites. It has tools that let the webmasters: Submit and check a sitemap Check and set the crawl rate, and view statistics about how Googlebot accesses a particular site Generate and check a robots. txt file. It also helps to discover pages that are blocked in robots. txt by chance.