First, you’ll want to use whatever photo editing program you like to crop into squares and resize all your 12 photos to be 3.75″ x 3.75″(the windows we cut into the matboard will be 3.5″ x 3.5″, so you want the photos a tiny bit bigger). I printed four photos per page as well so I could get more than one photo per paper.
Cut your photos out with scissors or an X-Acto knife and get your 16″ x 20″ matboard ready to cut.
Now we want to space out 12 squares evenly on the back of a 16″ x 20″ matboard. Cut out a 3.5″ x 3.5″ square of paper to be your window template and leave 2″ of blank space on the left and right sides and .75″ between each photo window on your horizontal rows. For your vertical rows, you’ll leave 1.875″ of space at the top and bottom (just get as close as you can to that) and .75″ between each photo window. I found where the exact middle of my matboard was and then measured out from there, but you can also cut 12 windows out of paper instead of one and arrange them that way until they are even and then trace the windows for cutting.
Once your windows are traced, use an X-Acto knife to cut each window out (with a ruler and cutting mat underneath).
Place your monthly photos face down in order and use a small piece of tape to secure them to the matboard.
Put your mat and photos into your frame and you’re ready to hang!