The flag of Vatican City is a square-shaped flag with two vertical stripes: one yellow and one white. The yellow stripe is positioned on the side closest to the flagpole and is twice as wide as the white stripe. At the center of the white stripe, there is a coat of arms consisting of two keys, one gold and one silver, crossed behind a papal tiara. The flag's aspect ratio is 1:1, and its geometric properties are that it is a rectangle inscribed in a circle. The color codes for the flag are:

• Yellow: Pantone 109 C / RGB 255, 211, 0
• White: No specific Pantone code / RGB 255, 255, 255

The measurements of the flag can vary depending on the size of the flagpole it is flown on.