In 1990, the interior ministry tasked Ladislav Čisárik, a painter and heraldic artist, and Ladislav Vrtel, an expert in heraldry, with creating a new coat of arms and national flag. Čisárik and Vrtel based their designs for a modern coat of arms and flag on an existing 14th century coat of arms. However, Čisárik and Vrtel chose to enlarge the double cross three times to emphasize it as a national symbol. In addition to the national coat of arms and the national flag, the duo also designed a new presidential standard, which incorporates the double cross as well.
The new flag was finally adopted (initially without Čisárik's and Vrtel's coat of arms) on 1 March 1990 as the flag of the Slovak Republic within Czechoslovakia. The coat of arms was added on 3 September 1992 and a special law describing the details of the flag followed in February 1993, after Slovakia became an independent country.