Convert pgm to gif Online: pgm2gif
You can use Tom's Editor to easily convert images from
Portable aNy Map .PGM to CompuServe Graphics Interchange Format .GIF.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
Portable aNy Map is an image format with extension PGM.
GIF images were created by Compuserve. They can used no more than 256 colors and a single color transparenty (no Alpha channel). Today are rare since they offer low quality and huge filesizes. GIF animations are still in use.