Convert jpt to png Online: jpt2png

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

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JPT

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

PNG

Portable Network Graphics is an image format with extension PNG.