Generate favicons in multiple sizes from your image
For websites, add to your HTML <head>:
<link rel="icon" type="image/png" sizes="32x32" href="favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="favicon-16x16.png">
<link rel="apple-touch-icon" sizes="180x180" href="apple-touch-icon.png">
Tips: Use square images with transparent backgrounds for best results.