How to Convert Multiple FITS Images to TIFF?
1. Download and Install reaConverter
reaConverter installs quickly on any Windows PC. No dependencies, no bloatware — just a clean setup that's ready to use immediately. Apply image edits like resize, crop, or color adjustment while converting.
2. Load your FITS files
Launch reaConverter and load the FITS files you want to convert. Add a few files or thousands, batch processing handles them all.
Drag-and-drop FITSs directly into reaConverter or use the folder browser to load entire directories.
3. Select TIFF as output format
Set TIFF as output format and select where to save your converted files. Customize quality settings if needed.
4. Start FITS to TIFF conversion
Press Convert to begin processing. You can watch the progress or minimize and let it run in the background.
Your converted TIFF files will appear in the destination folder as soon as processing completes.
What changes when you convert FITS to TIFF
FITS stores 32-bit greyscale covering the full dynamic range of the scan, and TIFF shows 8 bits. The conversion applies a window level, so what ends up visible depends on the window you choose. Decide separately whether patient metadata should be copied to the output or stripped from it. FITS carries 32 bits per channel and TIFF carries 16, so tonal steps get coarser during conversion. It shows up first in smooth gradients such as skies. If the result will be edited further, move to a 16-bit format only at the very end.
