Using a source PNG image with dimensions of 144x144, which will be our apple-touch-icon
used for Apple iOS and tablet devices.
$ convert -resize 32x32 -colors 256 favicon.png favicon.ico
Markup for HTML page <head>
area:
<link rel="icon" type="image/x-icon" href="favicon.ico" />
<link rel="apple-touch-icon" href="favicon.png" />