Image resolution can be quite a confusing topic. But don’t panic at the thought of how different operations with digital images might affect an image quality. We have developed our software to be able to change image DPI together with the image format. Adding "resize" operation just set a new DPI data, and the result will exceed your expectations.
You can learm more at: https://www.imageconverterplus.com/help-center/work-with-icp/examples/recomendation/image-resizer/