ico

Six ICO icon files at 16x16, 32x32, 48x48, 64x64, 128x128 and 256x256, from 512 bytes to 8 KB. ICO is the Windows icon format and the usual format for a website's favicon. Those sizes are the standard ones that browsers and operating systems ask for. Use them to test that your site accepts .ico, that favicon upload and resizing work, and that the right size is picked for each use. They are also handy for finding image code that fails on very small images, since a 16 pixel icon is far smaller than most tests assume.