If there exists a foto retouching that is done over and over, more than any other, it would have to be resizing. That makes it unsurprising that there are many specifically designed programs for this, like Winwatermark PhotoResizer.
The unique and final aim of Winwatermark PhotoResizer is resize all class of foto even though it is also a conversion tool to convert all image formats to JPG (as it only resizes in this format).
Once converted to JPG, Winwatermark PhotoResizer lets you change the size, resizing fotos in batches, without hardly losing any quality in the final resolution (whether you make it bigger or smaller).