companies usually sign contracts with the contract stamp, and of course, the official seal can also be used. The official seal can be used instead of the company's special seal for contracts, so both the contract stamp and the official seal can be used when signing contracts, and both of them have legal effect. In order to help you better understand the relevant legal knowledge, we have sorted out the contents related to the official seal or the contract seal for signing the contract. Let's take a look. 1. It is up to the parties themselves to decide whether to sign the contract with the official seal or the contract seal. When signing a contract, you can use the official seal, the contract seal, or both. The specific types of seals to be used are determined by the parties themselves through consultation or according to trading habits and industry practices. 2. Does a contract have legal effect if it is not signed but sealed? If the parties conclude the contract in writing, it will be established when both parties sign or seal it. We can't argue against this, that is, we can't think that as long as both parties don't sign or seal the contract, the contract will not be established. This should depend on the situation. If the contract requires that the contract be signed and sealed, it is not established because the contract does not have the effective requirements. If the contract does not require that the contract be signed and sealed at the same time, the contract that is not signed after the contract is sealed is also established. It needs to be further explained that if a contract is concluded in the form of a contract, the contract is also established if one party has fulfilled its main obligations and the other party has accepted it before signing or sealing, that is to say, even if neither signing nor sealing is carried out, but if one party has fulfilled its main contractual obligations and the other party has accepted it, the contract is also established. Third, where is the contract seal stamped? The contract seal is generally stamped in the following positions: 1. Stamp the official seal of the unit at the final signature of the contract; 2. Seal the signature of the legal representative at the last page of the contract; 3. If there are multiple pages, you need to stamp the riding seal. The above is a detailed introduction for you about whether to sign a contract with an official seal or a contract seal. I hope it will help everyone.