Can I switch from a DTV visa to a NON-O visa without leaving Thailand?

you need to send email to the embassy where you got the DTV.

Go to immigration and then they will advise you what you need to do they advised me to leave the country and do it from Australia but I stayed and finally got my visa

Yes. You can change in-country to a Non-O, if you meet the requirements and provide the (sometimes excessive) paperwork. Since you mentioned an officer at your local immigration already told you that you could … here you go. Don’t believe in any stories that a DTV would prevent you to switching during its validity or that you would have to cancel it yourself or something like that. Not proven. Having said that … I would keep the DTV. Not worth trading bank account access for regular immigration bureaucracy.

He can help u

Why would you want to enter visa exempt if you have a DTV?

It should be easy process, bring your passport and paperwork to immigration to inform them you have Non-O visa. They cancel your DTV. Next time you go out and come back you will be on non-o stamp. Not sure if immigration can stamp you at the local office for your new visa.

Keep it SIMPLE...

Do a BORDER BOUNCE...

with your DTV Visa...

Get the New 180 day stamp

Then look at your change from the DTV visa to a Non O Visa as Father of a Thai child.

That visa requires a 400,000 Thai baht deposit in a Thai bank account in your name only... two months seasoning before you Apply for the Non O Visa as Father of Thai child.

Frankly I think you've now got the best Thai Visa available...the DTV visa is a 5 year multiple entry visa.

Why would you want the Non O Visa?

There's no added benefits having it when compared to the DTV visa.

Your DTV is still active and is valid for 5 years. You cannot enter visa exempt