"Postcard size" refers to the dimensions or size of a postcard. It means that something is the same size as a standard postcard, which is usually around 4 inches by 6 inches or 10 centimeters by 15 centimeters.
Sentences with «postcard size»
Next, are 6 postcard size prints which show the plague damage from various parts of the world. (dvdsleuth.com)
They show 24 picture postcard sized pieces of art work regularly. (treehugger.com)
Over 400 individual works went into the postcard show with 200 artists providing postcard sized works. (arrestedmotion.com)