The online tool helps to convert your image to website favicon format(16x16 pixel, .ico format). And you can add special effects on the icon with just one simple click. To getting start, please click on the "Upload Files..." button that under Step 1 area. After you upload the generated favicon to website, you need to add the below code in the header of web pages:
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon" />
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon" />