PhotoWorker is a tool to resize and convert multiple image files at one time. It supports JPG,GIF,BMP,TIF,PNG,TGA,PSD and many more file types. With PhotoWorker, it is very easy to create thumbnails of your photos, extract multiple images from TIFF files, and convert image file types and bit-depth. It can also create shadows for better look in webpages, or overlay another image to add watermarks. You have full controls over the images you are going to generate with its rich set of conversion options. And because it is batch based, it can save you a lot of time from tedious manual editings.