Can I convert a 30-day exemption stamp to a Muay Thai visa in Thailand?

Many IOs enforce a 180 in a 12 Month -rolling- period. So, if you were here for last New Years, then got 3 visas and/or extensions then you would be over the last 180 day "rule." Don't look for it in any rulebook it's is a made-up thing.

As for if you can extend it, I have no freaking idea. It depends on the IO you get at the Immigration Center.

If you leave and want to come back in, remember, they count the 180 days from before you were last here.

So, if you go out, you should probably stay out a couple months if you want to get back in. Or just risk it if you don't care if you get refused entry.

I don't know if any of this applies to your case, but it is my experience.

With me, I was full up on visas and they allowed me one extension stamp, then almost got booted coming back in but I was given one more stamp when I showed them (they barely spoke English) I was in Malaysia and Indonesia for the previous 2 months.

Again, it is not a written rule anywhere. It is something they make up on the fly.

Sometimes they are looking for excuses just because you wore a T-shirt and shorts when you came to the counter.

Also, they don't like people who have dreadlocks. Saw a couple if them get booted before.

Not odd if you enter from airport to just be given 30 day without a prior visa. I wouldn’t read into it. I think they were just saying here is your visa.

I received my ed visa (Thai) inside the country, converted from visa exempt. Talk to your school. Due to covid situation they can offer visa inside the country on a case by case basis.

Yes you can convert anyway and you can also get another 30 day extension

Visa is applied outside of the country, extension of stay is applied in immigration inside the country. If you arrived without applying a visa, you have 30 day visa exeption which you can extent for 30 days at your local immigration office.

Are you talking about the immigration when you arrived at airport. Because they dont issue visas