The present disclosure relates to a system and method for matching a signature extracted from an electronic document (e.g., extracted as .jpg, .gif .png, etc.) with one or more other signatures. The system determines various signature attributes including a number of black pixels in the extracted image, the slopes of four different lines that bound the signature in the extracted image, and a normalized width to height ratio. Two (or more) signatures are considered a match if the attributes match to within specified tolerances. Individual attributes have their own tolerances. These tolerances are adjustable independent of the other tolerances for other attributes.