I installed Raspbian Jessie Light on a 16 GB card and then used raspi-config to expand the filesystem to fit the whole card.
Is it possible to go back?
That is, create a new image with smaller footprint without using another SD card reader? Or can raspi-config change it back?
I don't imagine dd will work while system is running on the card.
Maybe even a Windows tool where I can do it when the card is offline?