ReaThumbnails is a wizard-style utility to create a thumbnail gallery. It converts many images at once from the basic graphic formats to JPG and PNG and creates thumbnails. Create thumbnail gallery for many images at once.ReaThumbnails is a wizard-style utility to create a thumbnail gallery. It converts many images at once from the basic graphic formats to JPG and PNG and creates thumbnails. ReaThumbnails allows you to create thumbnails with different properties using themes - sets of editing actions that can be saved and applied if needed. The program has sample sets of editing actions (themes). You can change them or create your own. Every theme can have up to seven bookmarks with options of editing images for speeding-up and making easier thumbnail creation.