Convert otb to psd Online: otb2psd
You can use Tom's Editor to easily convert images from
On-the-air Bitmap .OTB to Adobe Photoshop
.PSD.
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.
PSD
PSD is in internal image format of Adobe Photoshop. It can store all the features offered by Photoshop, like layers and paths. Images can be compressed or not.