Convert j2k to bmp Online: j2k2bmp
You can use Tom's Editor to easily convert images from
JPEG-2000 Code Stream Syntax .J2K to Microsoft Windows bitmap .BMP.
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.
Format created by Microsoft for their Windows and OS/2 operating systems. Images can be compressed or not.