Hi, not strictly a visa question as I'm on the 30 day exemption stamp. I'm picking up new passport from my embassy this week, do I have to have my 30 days stamped into new passport, if yes do I need a letter from my embassy confirming passport change. I live in Chiang Mai. Thank you.
TLDR : Answer Summary
When picking up a new passport while holding a 30-day exemption stamp, you do not need to have the stamp transferred to the new passport. You can travel by using both your old and new passports during your exit from Thailand.