Biplav said:well a non animated gif can easily be resized in irfan view or for that matter any photo viewing software.
and for animated gifs u can visit here
Biplav said:u got irfan view??
just press Ctrl+R and then enter 80*80.
simple u are done.
but i think if its a proper wallpaper then automatically it will be resized in the same proportion and not exactly 80*80
for making it exactly 80-80 deselect "preserve aspect ratio"
thats it i suppose
kato said:try to save ur file in different formats i mean in png or gif or jpeg. Gif will get u a small size but hte problem is that the quality is reduced and png is good but sometimes does not reduce it as much as u need.Simply decrease the size of image further for making it a small file
Biplav said:reduce colour to 16 colours.