How can I extend my tourist visa in Thailand without visiting immigration in person?

@Stuart ********

yes you do

@Matthias *******

meaning ?

Matthias Seiler TM7 form is the most time consuming document you will need filled out. Use a BLUE pen. Download it from immigration website and fill it out before you come. You will most likely need the TM30 screen shot from your current hotel or residence so make sure you get it from the property owner. Can been a screen shot on your phone. Other than that bring your passport and the cash. Come an hour early before your booked appointment time and ask the immigration office for the required forms - they will likely depending on which office you are at give you additional declaration forms to sign. You then need to go to the photocopy shop next to the immigration office and ask them to print out everything else you need. They will know what to photocopy out of your passport. You also can get the required photo printed by them. They should also have a glue stick to glue the photo to your TM7 form. Tip don’t use too much glue to avoid ink smudges going through the paper. Have I missed anything out? No accomodation receipts needed for tourist extension - just your matching TM30 address on your TM7 form. Go back to immigration and tell the officers at the appropriate counter that you have an appointment when your allocated time starts.

@Nongnuch *******

so if its a tourist visa extension ,can pay agent to do for me ?