Convert otb to pdf Online: otb2pdf

You can use Tom's Editor to easily convert images from
On-the-air Bitmap .OTB to Portable Document Format .PDF.
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.

PDF

Adobe PDF format is the most popular document format. Overcomplicated. Offers compression.