Janowitz was born in Berlin, Germany, but grew up in Graz, Austria, where she became a naturalised Austrian. She studied at the Graz Conservatory in Austria, and had already begun to sing at the highest level by the end of the 1950s (Haydn's The Creation, with Herbert von Karajan in 1960). In 1959, Karajan engaged her as Barbarina in Mozart's The Marriage of Figaro at the Vienna State Opera, of which she became a permanent member in 1962. In the 1960s and 1970s, she became one of the most popular singers in her field internationally and she developed a comprehensive discography of works ranging from Johann Sebastian Bach to Richard Strauss, in cooperation with the most prominent conductors (her mentor at times, Karajan, as well as Otto Klemperer, Eugen Jochum, Leonard Bernstein, Rafael Kubelík, Karl Böhm, Georg Solti, Carlos Kleiber, etc.)
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One of the emphases of Janowitz's work was the development of song recitals, which she gave several times at the Salzburg Festivals. Following her vocal career, she was active as a vocal teacher. In 1990, she temporarily took over the position of Opera Director in Graz.