Can I Renew My 30-Day Tourist Visa in Thailand?

You won't be required to show proof of onward travel to get the 30 day extension. You need a filled out application for extension form called a TM7 (which you can download from our files section), copies of the data page of your passport, your entry stamp, your TM6 departure card, one passport sized photo and 1900baht. Those things will get you the 30 day extension at Chaengwattana AND there are copy shops in the basement that will make your copies, fill out the form and even take your photo if you need it :)