The Portable Network Graphics (PNG) format is designed to be a more efficient, flexible, and patent-free replacement for GIFs. PNG is designed to store a single bitmapped image to display over computer networks (1). PNG was created in 1995 as a response to Unisys’ enforcement of their patent on the LZW compression algorithm used in GIFs. While Unisys’ patent has expired, the reasons for switching to PNGs from GIFs remain (2). By replacing your GIFs with PNGs you can speed up your web pages and save bandwidth.