PSD to PSB Conversion is a simple tool that will allow you to mass-convert PSD files to it's sister format "PSB".
There is software (Affinity) that offer the ability to save as PSD, but not PSB which is the format that Unity3D uses for 2D sprites.
It's secure and safe and you won't need to worry about your work getting into the wrong hands as it's all local to your computer.
With PtPEC all you need to do is drag on all the files that you would like to convert and it will create copies into the source folder.
