[1][2][3] Karin Luts was born in Riidaja in Valga County to parents Andres and Juuli Mari Luts (née Gentalen) in April 1904 where she was one of three sisters, Lonny, Meta and Karin, and a brother Elmar.

In 1928 Luts spent a year at the Académie de la Grande Chaumière with André Lhote before returning to Estonia to work as an artist in Tallinn.

The Ministry of Economy commissioned her to complete a tapestry design to be displayed in the Estonia pavilion of the Paris World's Fair in 1937.

Luts article was a critic of an exhibition of Italian women artists held in Tallinn in 1937.

[1][9][10] In 1939 Luts traveled through Rome with the Tallinn Women's Club where she took the opportunity to work in the studio of the artist Countess Mola.

She married fellow professor Peter Arumaa and in 1944 they fled the soviet occupation of Estonia and went to Sweden.