In his teens, he secured an apprenticeship as a weaver, qualifying as a master weaver in 1927. Concerned that this trade offered few opportunities for advancement – and having observed the poor health of his co-workers – Stangl sought a new career. He moved to Innsbruck in 1930 and applied for an appointment in the Austrian federal police. Stangl later suggested that he liked the security and cleanliness that the police uniforms represented to him. He was accepted in early 1931 and trained for two years at the federal police academy in Linz.