How to Convert Multiple GIF Images to FITS?
1. Download and Install reaConverter
reaConverter is a standalone Windows app — download, install, and start converting GIF files in under two minutes. You can also resize, crop, and adjust images during conversion.
2. Load your GIF files
Launch reaConverter and drop in your GIF files. The software queues everything for batch processing with consistent settings.
Add files by dragging them in, browsing folders, or using the right-click menu from Windows Explorer.

3. Select FITS as output format
Pick FITS as output format and choose the destination folder where you want to save new .fits files.

4. Start GIF to FITS conversion
Then simply press the Convert button and your conversion will begin in no time!

Once the conversion is complete, you can find your FITS files in the destination folder you selected.
Before you convert GIF to FITS
GIF can carry an alpha channel and FITS cannot. Transparent areas are composited onto a solid background during conversion, so pick that background colour deliberately: white is the default, and it is rarely the right choice for a logo that will sit on a dark page.







