Is it possible to arrive on a single entry tourist visa, get married and then convert the visa to a year long multi entry based on marriage within the country? Or I'd have to travel elsewhere for a new visa?
TLDR : Answer Summary
It is not possible to convert a single-entry tourist visa directly into a year-long multi-entry NON-O visa while remaining in Thailand. However, one can convert a tourist visa to a 90-day NON-O visa based on marriage if requirements are met; this allows for an extension of stay. For a year-long NON-O visa, it is necessary to travel to the Savannakhet consulate in Laos or Ho Chi Minh City in Vietnam after getting married, as the Thai embassy in Vientiane does not issue multi-entry visas.
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