Can I convert a Tourist Visa to a Non-Immigrant O Visa Based on Marriage While in Thailand?

Okay, I deleted that "you're inside thailand" reply and will go back with the original one I had.

AT THIS TIME <- (meaning as of right now this very minute) there has not been a single person who entered on single entry regular tourist visa, got stamped in for 60 days, went thru quarantine, etc and then gone to the immigration office and converted that tourist visa entry to a 90 day non-O entry based on marriage. None, nada zero, zilch. :O

The reason for this IS they only recently started re-issuing single entry regular tourist visas and no one has come in with one and tried to convert it

Pre-covid-shit-show it was no problem to come into the country on a 30 day visa exempt or a 60 day tourist visa entry, meet the requirements at your immigration office and apply for an in country 90 day Non-O visa based on marriage. As long as you met the requirements AND had enough days left on your entry stamp to get thru the under consideration period of the visa application process you were fine.

I think you're going to have to wait until more people actually enter the country on a tourist visa now, because while Ben was totally correct in stating "in theory" it can be done, there is no hard evidence that they are doing it now..

Yes I was on on 30 day tourist visa pre amnesty. Had it converted to a 90 day non - O based on marriage and proof of funds in excess of 400k ( have a lot more and been in account for long time) no proof asked for where it came from. This was in pattaya I return to immigration 15 days before non- O expires to show same paperwork again and new bank letter confirming I still have funds.

This was at Jomtien immigration. So it’s sort of works out a 15 month visa if all goes well.

Also just to note- worth making spare copies of all documents first time you do them to keep at home for future use.

Will often be asked for same again and they don’t return what you did first time. So I’ve had to do documents again- bit of a pain but now keep a master copy for future photocopying.

you will need the financial proof for the application to the visa itself, (not for the subsequent Extension of Stay) And SOME immigrations at this point ask for proof that the funds came from abroad. Some other immigrations don't ask for it. This is what you have to expect . . . . . Good Luck!

In theory, you should be able to. Contact your local immigration office and ask for the handout for an extension of stay based on marriage to a Thai national.