Convert j2k to flif Online: j2k2flif
You can use Tom's Editor to easily convert images from
JPEG-2000 Code Stream Syntax .J2K to Free Lossless Image Format .FLIF.
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.
Free Lossless Image Format is an image format with extension FLIF.