How can you convert a Tourist Visa to Non-Immigrant B while in Thailand, and what documents are needed?

To convert a Tourist Visa to a Non-Immigrant B Visa in Thailand, you should visit your local Immigration Office to determine if the conversion is possible at that location, as not all offices offer this service. Some users suggested checking available resources in specific group files for documentation requirements, such as 'ChangevisatoNon-Bdocs.pdf' and 'ChangevisatoNon-Bteachingdocs.pdf'. Additionally, it may depend on your specific circumstances, such as employment status, e.g., being a government school teacher.