Convert fits to psd Online: fits2psd

You can use Tom's Editor to easily convert images from
Flexible Image Transport System .FITS to Adobe Photoshop .PSD.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

FITS

Flexible Image Transport System is an image format with extension FITS.

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.