It is very simple to use. You just drag as many images as you like into the program window, and select the tasks you want to perform from the right hand column. These tasks are divided into two groups: 'save as' and 'resize'.
Within the first group, 'save as', you can change both the name of the images and their format by selecting one from the following: BMP, DIB, RLE, TIF, TIFF, FAX, G3N, G3F XIF, GIF, JPG , JPEG, JPE, JIF, PCX, PNG, TGA, TARGA, VDA, ICB, VST, PIX, PXM, PPM, PGM, PBM, WBMP, JP2, J2K, JPC, J2C, DCX, DAT, PSD, WDP or HDP.
From the second group, you can choose between options like modifying the height and width of the images, changing the resolution, or applying different filters.
ImBatch is a very comprehensive image conversion tool. It has a beautiful and intuitive interface, and allows you to manipulate dozens of photos at a time with just a few clicks on the mouse and in a matter of seconds.