All of our patterns are formatted to be printed at home or at a copy shop. Our print-at-home files will print on both Letter and A4 paper. If you are printing at home, please make sure to use the Letter/A4 paper files. This format can be used on any home printer, whether you're using imperial or metric paper. We suggest you use Adobe Reader (its free!) or Apple Preview to print your files. It is very important to select “No scaling or “Print at 100%” when you are printing. Make sure you print and measure the test square on the first page to make sure you are printing at the correct scale. Directions for printing digital files are included in all of our PDF instructions. It is very important that you print your pattern to the proper scale. Always print the first sheet with the scaling box first to ensure your printer settings are correct.