Convert otb to png Online: otb2png

You can use Tom's Editor to easily convert images from
On-the-air Bitmap .OTB to Portable Network Graphics .PNG.
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.

PNG

Portable Network Graphics is an image format with extension PNG.