Convert viff to gif Online: viff2gif

You can use Tom's Editor to easily convert images from
Khoros Visualization Image .VIFF to CompuServe Graphics Interchange Format .GIF.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

VIFF

Khoros Visualization Image is an image format with extension VIFF.

GIF

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.