driving license convert

Go to the department of Land and Transport

You need your passport, international driving licence, certifcate of residence, medical certificate, a form to fill in there, photo will be taken by them, you will pass a eyes test colour, cost around 105 for the 1 year and around 605 for the 5 years ( you can only have 1 year first and when you will renew after 1 year you can get the 5 years )

I recently did mine, i remember you will need Passport, Work Permit valid Driving License, 2 photos.
Unfortunately my Driving License was expired and I had to take the test.

check more info at:
driving.information.in.th/

What? Why do it need a wp?

Probably to certify your legal address, check the link also for more info on that.
You may get an Embassy certified letter of you address if no work permit.

driving.information.in.th/

You don't need work permit, just a certificate of residence, it is valid 1 month and cost 500 THB, unless you got a yellow tabien book, it is the same certificate of residence required for visa, or to buy a car, or motorbike

need my passport or not?

Jamikayes wrote:

need my passport or not?

Yes of course as listed previously, it is the only proof of your identity and legal stay in Thailand ( immigration stamp / visa / ... ).

With an international driving license, you can drive since you are here on a business or student or tourist visa. From your posting, you don't have a work permit. Not sure if SG embassy will give you a residence permit letter & you need to check. With all the hassle, use international driving license solve the problem.