Help with interpolation

Hi guys!

i have afew pictures that i need to up-res, but i dont have photo editing software. if anyone of your could be so kinda as to help me up-res then send back to me would be very very appreciative.

first picture is 1200pixels up to 3000 pixels on the long end. quite a stretch(literally) and second is 2300 up to 3000.

is this possible? need to eek the highest possible image quality to print for these files.

thnx very much,

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