Call of Duty Wiki:Signature policy

Users are permitted to have images in their signatures, or as their signature, so long as the height does not exceed 30 pixels. This includes animated signatures, but some may stop animating below a certain pixel size. Images over 30 pixels cause the spacing between two lines of text to be disproportionate, and animated signatures can result in longer load times for discussion pages. As a general guideline, however, please do not use images or font sizes that will interfere with the lines of text.