The official seal is the signature seal made by state organs, social organizations, enterprises and institutions in their own names, and the private seal is the signature seal made by natural persons in their own names. According to the law, if the parties conclude a contract in writing, it will take effect when both parties sign or seal it. Therefore, stamping and signing have the same legal effect, both of which are confirmation of written intention.
For a natural person, both the signature and the private seal are completed by themselves, which have the same effect and generally will not be controversial. But for a company, it needs the signature or seal of a specific natural person to realize its will, and a natural person is also an independent legal subject. In this case, it is very important to determine whether the behavior of a natural person is his own behavior or represents the professional behavior of the company. Stamping the official seal has functions that the signature does not have. The act of a natural person affixing the official seal on the contract shows that the act is a professional act rather than an individual act, and the company should bear the legal consequences.
Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC). If the parties conclude a contract in the form of a contract, the contract shall be established when both parties sign or seal it.