Systems, methods, and computer-readable storage media that may be used to generate representative sample images for content campaigns are provided. One method includes identifying a resource in which a content campaign item has been previously displayed. The method further includes determining a content slot within the resource in which the content campaign item was previously displayed. The content slot is determined based on a slot signature associated with the content slot. The method further includes retrieving a current version of the resource, where the current version of the resource includes a current content item appearing in the content slot. The method further includes generating a representative image of the resource that includes the content campaign item by replacing the current content item appearing in the content slot within the current version of the resource with the content campaign item.