Convert j2k to psd Online: j2k2psd

You can use Tom's Editor to easily convert images from
JPEG-2000 Code Stream Syntax .J2K to Adobe Photoshop .PSD.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

J2K

JPEG-2000 Code Stream Syntax is an image format with extension J2K.

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.