The flag of El Salvador features a horizontal triband of cobalt blue-white-cobalt blue, with the coat of arms centered and entirely contained within the central white stripe.

The country's flag is one of the few that currently use the color purple, due to the rainbow in its coat of arms.

[3] From 1865 to 1912, a different flag was in use, with a field of alternating cobalt blue and white stripes and a red canton containing stars.

Synonymous to the country's wealth, the colonizers referred to the dye as "the blue gold", that dominated El Salvador's economy until it was completely replaced by coffee cultivation.

Today El Salvador remains as one of the few countries in the world that still cultivates indigo to produce blue dyes.