must apply for the appropriate visa to enter Thailand.
Visa is normally valid for 60 days. For longer stay, a renewal
visa can be applied for at the Immigration Department. Extension
will be granted for up to 30 days at a time .
Visa allows staying in Thailand for 30 days. Extension are granted
for periods of 7-10 days.
from any country included in an officially issued list of eligible
countries are permitted one-month visa-free visits. For longer
stay, They must obtained a Tourist Visa, valid for 60 days, from
a Royal Thai Embassy or Consulate abroad.
is best to comfirm all details with a Thai embassy or consulate
in your home country.