1. Oval seals are generally used in companies, while circular seals are generally used for external use.

2. The oval seal does not need to be filed in the public security department, and the circular seal needs to be filed in the public security department.

The oval seal can be used to stamp the invoice, but the round seal can't.

The official seals of state-owned units, institutions, limited companies, self-employed, government agencies and the army are all circular seals, while those of Macao, Taiwan Province and foreign-funded enterprises are foreign-funded enterprises, and the official seals are 45X30MM oval bilateral seals.

Legal basis: Measures for the Administration of Public Security of Seals

Article 5 It is forbidden for any unit or individual to buy or sell seals, and it is forbidden to make or use seals illegally.

Article 6 The seals of state power, party and government, judiciary, political participation, armed forces, armed police, democratic parties, the Communist Youth League, trade unions, women's federations and other organs and organizations shall be issued in accordance with relevant state regulations.

Article 7 Where the organs and organizations of state power, party and government, judiciary, political participation, armed forces, armed police, democratic parties, the Communist Youth League, trade unions, women's federations, etc. at all levels need to engrave seals, the seal management department of the issuing organ shall issue an official letter and go through the filing formalities with the public security organ of the local people's government at or above the county level. The public security organ of the people's government at or above the county level shall immediately handle and issue an accurate engraving certificate.