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Signature Size should be no larger than 800x250 pixels. That is 800 pixels in width and 250 pixels in height. This include all pictures and text within a signature. The purpose of this rule is to cut down on the amount of scrolling a user will have to do through forum threads as the signatures will take up a portion of the room on the page. A diagram of this size limit is included in a separate post below.
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There you have it...maybe check out the rules if you haven't yet, they'll help you avoid any possible future troubles, I'm sure you don't want to get infected or anything.