Convert j2k to png Online: j2k2png
You can use Tom's Editor to easily convert images from
JPEG-2000 Code Stream Syntax .J2K to Portable Network Graphics .PNG.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
JPEG-2000 Code Stream Syntax is an image format with extension J2K.
Portable Network Graphics is an image format with extension PNG.