This motto from a Sony's advertisement campaign explains pretty well the digital photography revolution.
You end up with thousands of pictures. And because marketing pushed up the number of pixels, you have gigabytes of precious moments of life. That's fine on a PC. Space is cheap on hard drives and you have great tools to organize and enjoy your collections.
But you also want also to enjoy your remembrances elsewhere and to share them. Space is expensive on tablets and mobile phones. Download speed is in many places too slow for gigabytes.
On some download sites, JustResizeIt! (free) is listed as JustResizeIt free and JustResizeIt!+ is listed as JustResizeIt plus due to product name symbol restrictions.