Convert otb to gif Online: otb2gif

You can use Tom's Editor to easily convert images from
On-the-air Bitmap .OTB to CompuServe Graphics Interchange Format .GIF.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

OTB

On-the-air Bitmap is an image format with extension OTB.

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.