Whether you're mailing a letter or postcard, the USPS has certain requirements for the design of your piece. These guidelines are important because they help ensure your mail gets to its intended recipient on time. They are also a great way to avoid surcharges.
There are four types of mail pieces that you can mail: letters, postcards, brochures, and catalogs. These are classified into different categories based on the size of the piece and the contents. However, there are also classes of mail that have additional specifications, including weight limits and shape restrictions.
A letter is a rectangular piece of paper that measures no more than 11.5 inches wide and 5 inches tall. It is also at least 0.007 inches thick. The USPS defines postcards as postcard-size pieces of paper that measure no more than 6 inches in length and width.
Catalogs and brochures must be rectangular in shape and must be no more than 10.5" in length and width. They also must have a minimum width of 5" and a maximum height of 6". The USPS also requires wafer seals on booklets.
Postcards are 0.007 - 0.016 inches thick and measure no more than 6 inches in length and wide. The USPS also requires a return address, which is typically placed at the top of the card. However, postcards are also mailed at a lower postage rate than regular mail.
If you want to mail a postcard, the USPS allows you to use the Facing Identification Mark (FIM). This is a small pattern of vertical bars that speeds your envelope through the system.
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