Arndt was born in Magdeburg, Kingdom of Prussia. From 1910 he was a member of the Burgretheater ensemble in Vienna. He also made occasional appearances in supporting roles in films. On 13 March 1931, he was made an Honorary Citizen of Vienna.
On 10 July 1942, at the age of 81, he was deported to the Theresienstadt Ghetto, and from there on 23 September of the same year to Treblinka extermination camp, where he is presumed to have been murdered shortly afterward.
Filmography
Herbstzauber (1918, directed by Emil Albes, Germany) as agricultural labourer
Der Umweg zur Ehe (1919, directed by Fritz Freisler, Germany) as Joe Castor
Seine Durchlaucht der Landstreicher (1919, directed by Paul L. Stein, Austria)
Licht und Schatten (1919, directed by Artur Holz, Austria)