Convert ist to psd Online: ist2psd

You can use Tom's Editor to easily convert images from
Interlace Studio .IST to Adobe Photoshop .PSD.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

IST

Interlace Studio is an image format with extension IST.

PSD

PSD is in internal image format of Adobe Photoshop. It can store all the features offered by Photoshop, like layers and paths. Images can be compressed or not.