If you fold A4 in half you get A5, and if you double up A4 you get A3. They are all the same exact proportions.
US sizes don't work like that; the closest thing to A3 here doesn't have the same proportions as the closest thing to A4. Which absolutely sucks if you are designing a poster and need to make it bigger or smaller.
With international A sizes you can reuse the same design for any size. That's why I like them.
US sizes don't work like that; the closest thing to A3 here doesn't have the same proportions as the closest thing to A4. Which absolutely sucks if you are designing a poster and need to make it bigger or smaller.
With international A sizes you can reuse the same design for any size. That's why I like them.