During Krakowski's tenure as the director of the Yad Vashem archives, the volume of them tripled and the relations with the office of investigations of Nazi crimes at Ludwigsburg, Germany, were strengthened. He was involved in improving the contents related to reports of Nazi war criminals, including the files of the Soviet commission of investigation of Nazi crimes and the archives of the Jewish Anti-Fascist Committee that operated during the war in the Soviet Union. Krakowski initiated the connection with the Soviet archives and, when they became accessible, also initiated their photocopying and integration with Yad Vashem archives.