Kęstutis Indriūnas graduated from Kaunas Juozas Naujalis High School in 1979. In 1980-1985 he studied at the Kaunas Faculty of the Vilnius Academy of Arts, where he obtained a degree in architectural design.

He has been drawing since his youth. While still a student, he began to exhibit his graphic and pastel works in Vilnius and Kaunas art salons and Kaunas artists' exhibitions.

Kęstutis Indriūnas' paintings are characterised by clear lines and pure colours, one of which usually becomes the main accent. Landscapes are constructed through the contrast of light and darkness, dividing the visible image into large geometric planes. The work is dominated by images of his native Anykščiai and its surroundings.