Convert jp2k to png Online: jp2k2png

You can use Tom's Editor to easily convert images from
JPEG 2000 .JP2K to Portable Network Graphics .PNG.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

JP2K

JPEG 2000 is an image format with extension JP2K.

PNG

Portable Network Graphics is an image format with extension PNG.