

WordPress recommends it be at least 250px by 250px wide because it also uses it as your iOS button logo. There, you can specify an image to be your logo. Then click on Site Identity and click on the logo area. Log into your site and go to Appearance -> Customize. WordPress provides a way to specify the favicon. Adding this tiny detail really gives your website a professional appearance in the browser. The little icon that shows up in each web page’s browser tab is called a “favicon”.
