This page contains info about favicon.ico files. For more, or if anything here looks wrong, go to Google and search on favicon.ico. Or try http://www.favicon.com/
The simple story
The favicon.ico file should contain a 16×16 pixel image.
You can build the image in any program that can produce a .bmp file. Photoshop, for example.
- In some working folder in which you have image sources, take a full size logo and scale it down to 16 x 16 px.
- Clean up the tiny logo by turning on and off individual pixels until you get a decent icon.
- Save as .bmp.
- Convert the .bmp file to a .ico file using the utility “irfanview” with is available from download.com (http://www.irfanview.com/). It looks from a quick google search like there are other utilities that do this.
- Copy the .ico file to the top level of your website and rename it to favicon.ico.