SWIGS is a system for creating hierarchically-organized sets of thumbnail galleries. Multiple sizes for each image are produced automatically, and each image can be annotated with a relevant description, date, photo credit, etc. The image galleries (albums) have a tree structure, each album possibly containing pictures and/or additional albums. Each album contains a set of thumbnail pages for the images, a text-only list of all the images in the album (with description if available), and a page listing all the sub-albums of the current album. The HTML output is controlled by templates that can easily be edited. Convenient navigation links are provided, and a single page summarizes the tree structure of the whole.