How to Convert Multiple FITS Images to IGS?
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. You can also resize, crop, and adjust images during conversion.
2. Load your FITS files
Open reaConverter and import your .fits files. No file limits, no slowdowns. Add as many as you need.
Drag files into the window, use the Add Files button, or select entire folders.

3. Select IGS as output format
Select IGS as target format and pick where to save results. You can keep default settings or fine-tune the output.

4. Start FITS to IGS conversion
Hit Convert to process your files. The log window shows progress, timing, and status for every file.

Conversion complete? Your IGS files are saved to the destination folder, ready to use.
FITS to IGS: what to expect from the conversion
FITS is made of pixels and IGS is a geometry format, so the two describe images in fundamentally different ways. Check the result before sending it downstream: what matters is whether the output contains editable geometry or a picture placed inside a IGS container, and that determines whether a CAD or design tool can work with it. One FITS file can hold several pages or frames, while IGS holds one image each. reaConverter writes a separate output file per page and numbers them, so a single input can produce a whole folder of results.









