DIY Envelope Template

Here's an easy way to make an envelope template to fit any card size. You'll need an envelope that's too big for the card, scissors, and tape (removable if you want to be able to resize the template).

Gently unfold the envelope.

Cut it into four pieces. It doesn't have to be exact, but cut so you cross somewhere near the middle.
I like to number the pieces before cutting to help keep things in order, but you don't have to.

Place your card in center of the envelope pieces, and fold the envelope around it so it fits properly.
Tape the pieces in place. You should only need one piece of tape on the side without the flap.

Now you have a template. Trace on your paper, cut it out, and glue it together as the original envelope was.