The current design of the flag of Paraguay (Spanish: bandera de Paraguay; Guarani: Paraguái poyvi) was first adopted in 1842. Its design, a red–white–blue triband, was inspired by the colours of the French Tricolour, believed to signify independence and liberty. The flag is unusual because it differs on its obverse and reverse sides: the obverse of the flag shows the national coat of arms, and the reverse shows the seal of the treasury. It is the only national flag worldwide that has a unique design on each side. The flag consists of the same three horizontal colours as the flag of the Netherlands, which in turn was the inspiration for the French flag. It was revised in 2013 to bring the flag towards its original design. It has a ratio of 11:20.

Prior to the current design, the country used two other designs: a similar one with no seal where the white stripe was slightly larger than the other two (1812–1826), and a different simple design featuring a blue field and a six-pointed white star in the upper-left corner (1826–1842). Wikipedia