How can I convert a Tourist Visa to a Guardian Visa (Non-Immigrant O) in Thailand, and what is the process?

Converting a Tourist Visa to a Guardian Visa (Non-Immigrant O) in Thailand may not be permitted while in the country, as some users have suggested. It's important to gather required documents, which include a Thai birth certificate proving parental relation and the other parent's Thai ID card, alongside having a minimum of 400,000 THB in a Thai bank account for at least two months before applying. Costs for the process can vary, with indications that extensions might require 1,900 THB, while the visa itself could cost around 2,000 THB. Experiences with agencies, such as the Thai Visa Centre, vary and personal handling is suggested to avoid high agency fees.