The biggest label I've made for a quilt was about 8x14. I made it for a friend who had a lot to say lol. I used 3 different sized fonts as per her wishes. The smallest fonts I've used on a quilt label I think were 1/4", I think I might have one that's smaller, I can't remember now. I've bought tiny fonts from a couple of places but the only one I can think of right now is 5 star Fonts.
Cari