Convert fits to bmp Online: fits2bmp

You can use Tom's Editor to easily convert images from
Flexible Image Transport System .FITS to Microsoft Windows bitmap .BMP.
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.

BMP

Format created by Microsoft for their Windows and OS/2 operating systems. Images can be compressed or not.