Is it possible to convert a Non-B visa to a Non-Ed visa without leaving Thailand?

FocusedKoala2589 you said your going for your masters that’s means a student right you’ll need paperwork from the school your going to attend

FocusedKoala2589 You don't have a non-B. You have a work extension. You need to use the correct terms if you want the correct answer. You would also not be changing to a non-ED, you would be changing from work extension to education extension.

FocusedKoala2589 So you need to check with your immigration to find out if they will allow you to do this.

What you would do is get work from your employer that states your last day of work. You then use this to cancel your work permit and then take both of those to immigration to cancel your work extension. Yes, you MUST cancel it even if it's expiring.

At the same time you cancel it, you would then apply for a new extension based on education, rather than work. You're not changing any visa, because you don't have a visa. You are just applying for a new extension, except the reason for the extension is different from your last extension. The only issue is that some immigration offices might not support going from work extension to education extension, and that's why you need to ask them if they would allow it.

If they don't allow it, it means you would need to leave Thailand after cancelling your work extension (yes, you still have to cancel it even if it's expiring) and then either apply for a non-ED visa from a Thai embassy or consulate, or return to Thailand as a tourist and apply to convert from tourist to 90-day non-ED visa inside of Thailand. Once again with that last option, you would need to check with both the school and the immigration office if they allow conversions to non-ED from tourist inside of Thailand. It requires a truly massive amount of paperwork, so some schools either cannot or will not support such a conversion, and that's if your immigration office supports it all. Your school should know if it's possible though.