How to Convert Multiple GTIFF Files to ICO?
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 GTIFF files
Start reaConverter and load all the .gtiff files you intend to convert into .ico. The software supports multiple GTIFF conversion and processes all files locally on your computer.
Select GTIFFs from a folder or by drag-and-dropping them directly into the reaConverter window.

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

4. Start GTIFF to ICO conversion
Then simply press Convert button and your conversion will begin in no time!

Once the conversion is complete, you can find your ICO files in the destination folder you selected.