I've found that image-to-favicon generators generally don't work very well. They're fine for generating the larger icons but the 16x16 ones generally look like

I've found that image-to-favicon generators generally don't work very well. They're fine for generating the larger icons but the 16x16 ones generally look like crap. Those really require some tweaking on the pixel-level and require design skills not many people have, so I usually favor simpler favicons that can be manually created with a graphics editor.