SmillaEnlarger to the Rescue
SmillaEnlarger is an open-source photo enlarger for Windows. It's easy to install, since it has no setup program: Just drag the folder anywhere you wish and then run the application. To use it, drag a photo into the program window and specify the new size. You don't need to tweak the program settings to obtain great results. Simply click the Preview
button to see what the final image will look like. If you're satisfied, specify a name for the image and clickEnlarge & Save
. The results can be stunning.