I need some way to make a letter and tear-off certificate out of a single sheet of paper?

Question

I wanted to make all the kids from our summer workshop a little certificate I could send them in the mail. I wanted it to be a normal piece of paper that you could like, fold twice to go.

The top two-thirds of the paper would be like a letter and the bottom third would be a little personalized certificate they could pull off and keep.

But I don't know where people get paper like that, or is there some kind of tool you could use to serrate the paper or something?

Thanks in advance for your answer.

Answer 1

You can get a perforating tool at a craft store such as Michael's, or an office supply store like Office Depot or Staples.  

It looks like a tiny pizza wheel, but it makes a cut then leaves a space.  You can also get a cheap paper cutter with a wheel (not the guilotine type).  They sell different wheels and one of them is a perforator.  I always thought the perforator wheel would be a handy tool to have -- but I'm such an office suply geek!