What is the process to transfer a visa to a new passport in Thailand?

To transfer a visa from an old passport to a new one in Thailand, bring both passports to your local immigration office. Generally, there is no official form required; the immigration officer will handle the transfer process for you. Confirming your specific visa type is essential, as typically only extensions or stamps related to your stay can be transferred, not the actual visa itself. When entering Thailand, ensure to carry both passports until the new passport is solely used.