Improve your Website Indexing: On-Page SEO is the No #1 Plugin for allowing website crawling by all Search Engines. As we mentioned at the outset, a little slip-up might keep robots from crawling (significant pieces of) your site. Another option now is available for Whatsapp Chat message and robots.txt auto file genneration and modification. By default, WordPress is not provided robots.txt files, when this plugin is added then automatically added the robots.txt file and check the sitemap.xml file. On-Page SEO is a powerful and easy-to-use plugin that can add Robots.txt files, Whatsapp and User submit post form. Whatsapp chat Button feature to your WordPress website to manage social live chat of your website.