Is there only one standard sized window and window position on a #10 Window Envelope?
Not at all. In fact there are many custom possibilities as to the size window and its position on the envelope.
However all window envelopes have one thing in common. The window needs to start atleast 1/2" in from the left and 1/2" up from the bottom of the envelope.
Here are its dimensions as well as templates to design off of:
Envelope Size: 4.125" x 9.5"
Size of Window: 1.125" tall x 4.5" wide with 1/8" rounded corners
Position of Window: 1.375" in from the left, 0.5" up from the bottom