Free Printable Santa Letter Template (with Envelopes and "Stamps"!) Step 1: Print the Santa Letters and envelope templates. You can get instructions for how to download the letters at the end of this post. Then, print the ones that you want to use, or print them all! I recommend printing on a heavier weight printer paper (like 28 or 32 lb.), especially if you save your kids' Santa letters as keepsakes.