.ico, .gif, .jpg, .png - correct favicon image extensions
Now you have learned
how to change your blogger favicon to your favorite icon or image. However after following the instructions, it still has that old blogger favicon and the code didn't work at all. You might have inserted a wrong image url.
Favicon / Image Extensions
There are many image extensions but you should consider only four that can be used on the web. These are the GIF, JPEG /JPG, PNG, and the icon extension ICO.
Correct Image URL
Before inserting a link, make sure that the link is alive. The link should be the direct address to the image itself and not to the page or post you have seen it. The following URL format should be followed:
http://{address here}/{image name}.gif
http://{address here}/{image name}.jpg
http://{address here}/{image name}.jpeg
http://{address here}/{image name}.png
http://{address here}/{image name}.ico
You should open the link first to know that it is alive and you have the correct direct link of the image. To determine that the link is alive, when you open the link, it should display the image alone and the favicon of the link is the image itself.
Sample Images
http://www.jellymuffin.com/icons/happy_birthday/images/53.gif
http://www.downloadatoz.com/_imgbank/ha/happy-birthday/Happy-birthday.icon.gif
http://t0.gstatic.com/images?q=tbn:ANd9GcRXR-I3LQHxEfABq0ACT3-7scIXFTKgRcbZNswFI5ybJaB78mXq
http://www.logosforwebsites.com/wp-content/uploads/2009/07/favicon.ico
http://i203.photobucket.com/albums/aa109/Malder666/Misc/favicon.png