The primary function of easy-thumbnails is to dynamically create thumbnails based on a source image. So whenever a thumbnail does not exist or if the source was modified more recently than the existing thumbnail, a new thumbnail is generated (and saved). Thumbnail aliases can be defined, providing predefined thumbnail options. This also allows for generation of thumbnails when the source image is uploaded. WWW: http://pypi.python.org/pypi/easy-thumbnails/ WWW: https://github.com/SmileyChris/easy-thumbnails