How to Convert Multiple GBP Files to FITS?
1. Download and Install reaConverter
reaConverter is quick to download, install and launch. This standalone software is extremely efficient in managing a wide range of batch conversions. reaConverter is incredibly powerful and boasts an extensive variety of features.
2. Load your GBP files
Start reaConverter and load all the .gbp files you intend to convert into .fits. The software supports multiple GBP conversion and processes all files locally on your computer.
Select GBPs from a folder or by drag-and-dropping them directly into the reaConverter window.

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

4. Start GBP to FITS conversion
Then simply press 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.