I often use the free program called Irfanview to resize ( it has several presets and percentage settings) It has several algorithms to choose from depending on the type picture or speed vs quality etc.

It allows batch processing and a one click "Auto Adjust colors" setting that often produces my best results nearly instantly. The program also allows one click "Sharpen", "Rotation" and surprisingly Irfanview does the best job of increasing the size of a picture ( a mostly never satisfactory procedure).

Many more things and all free.