Generally speaking, the letter of commitment is not stamped and has legal effect. Because in law, the letter of commitment does not need to be stamped or signed to have legal effect. As long as the content of the letter of commitment conforms to the law and is true, it can be bound and exercised according to its content. Of course, if a specific commitment needs to comply with specific legal provisions or needs to have a specific legal form, then it needs to be stamped or signed according to relevant provisions to ensure its legal effect.

In addition, for some important or crucial commitments, it is recommended to consult with the other party and confirm in writing before signing, so as to avoid disputes. In addition, if it is necessary to investigate the legal responsibility of the promisor, it is also necessary to provide evidence and apply it according to the specific situation.

A letter of commitment refers to a written document that voluntarily makes a certain commitment, and its specific provisions are as follows:

1. Content requirements: The letter of commitment shall specify the content, conditions and time limit of the commitment, and require the content of the commitment to comply with the legal provisions;

2. Form requirements: the letter of commitment can be oral or written, and the written letter of commitment should be clearly expressed in written documents;

3. Signing method: The letter of commitment is signed by the promisee, or the promisee may be required to sign for confirmation. After signing, each party holds one copy;

4. Legal effect: the letter of commitment has certain legal effect in law, and its effect is determined according to the content of the commitment and legal provisions;

5. Liability for breach of contract: if the promisor fails to fulfill the promise, it needs to be investigated according to the specific situation, and may be liable for breach of contract.

To sum up, due to geographical, industry, specific content and other factors, the specific provisions of the letter of commitment may be different. When signing the letter of commitment, you need to understand the relevant regulations and requirements, and sign in accordance with the regulations and requirements to safeguard your legitimate rights and interests.

Legal basis:

Article 490 of the Civil Code of People's Republic of China (PRC)

If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.