Enable Anonymous Access in SharePoint 2013

• Go to  Central Administration, Choose Application Management, select Manage web applications .
• Select the site you want to enable anonymous access on and click on the Authentication Providers icon.
• On the Authentication Providers pop-up window click on the Default zone.
• Edit Authentication, Enable anonymous access and click Save.
• Select Web Application Management click on the Anonymous Policy icon.
• Under Anonymous Access Restrictions select your Zone and set the Permissions to None – No policy and click Save
• Web application will allow anonymous access to be set. 
• Navigate to your top level site collection for the web application. 
• Site Actions > Site Settings. Under Users and Permissions click Site permissions
• Permission Tools, Click Anonymous Access icon and set the permissions to Entire Web site