Go here _
http://www.gifworks.com/image_editor.html
Click " File " at the upper left on the toolbar, from there select " File Open "
then in the following window Click " Browse " at the lower right to locate
your gif from your computer 's folder to upload. Your limit is a 400 KB file.
The next window shows your image in action. Click " Edit " on the tool bar
and select Resize/Crop -> Resize. Another window opens , check the box
" constrain proportions " and enter the largest allowable pixel size for the
largest dimension , height or width. Close the window , right click the
resized image and select " Save picture as ".