Do I need to visit immigration to transfer my entry stamp to a new passport while in Thailand?

When obtaining a new passport while in Thailand, you must visit the immigration office to transfer your entry stamp from the old passport to the new one. Bring both passports and necessary documentation, such as a letter from your embassy explaining the passport change. However, if you are departing Thailand shortly after receiving the new passport, you may exit the country with both passports without needing to transfer the stamp, as the process might only be required for longer stays.