Which Allied declaration did Japan accept when it agreed to surrender in August 1945?

Japan accepted the Potsdam Declaration when it agreed to surrender in August 1945.

Issued on July 26, 1945, the declaration called for the unconditional surrender of Japan's armed forces. It warned that refusal would bring “prompt and utter destruction.” The United States, the United Kingdom, and China issued the declaration during the Potsdam Conference.

The document also outlined broad postwar aims. Japan's military was to be disarmed, territories seized through conquest were to be removed, and democratic freedoms were to be encouraged. Japanese sovereignty would ultimately be limited to the home islands and other islands specified by the Allies.

The Soviet Union did not initially sign the declaration because it was still neutral in its war with Japan. After the atomic bombings, the Soviet declaration of war, and intense internal debate, Japan informed the Allies on August 10 that it would accept the terms, subject to preserving the emperor's status. The formal surrender document was signed on September 2.