You can use 12x12 paper; however, because this is the smaller travel size, you may not be able to stamp where you really want if you're looking to stamp more to the middle of your paper. The standard size platform may be more of what you will go to for 12x12. If you are just stamping at the edges or within the 6x6 area and not concerned for the rest of the page on 12x12, then yes, you can use the travel platform. That said, a travel size *and* a standard size platform together will cost less than some other platforms out there. Personally, I have both, and the travel size is used more, as I do not stamp on a lot of projects requiring a 12x12 size. I do not regret at all having bought both, though, as I have the tools for my various needs and can use either. I've been very happy with them.