Postcard Size: USPS Dimensions & Requirements

You can be assured that the variety of postcard templates offered in our Real Estate Direct Mail and QuantumPostcard systems are in accordance with USPS postcard guidelines.

However, if you find it necessary to create and upload your own custom artwork, the USPS has some strict postcard requirements that you'll want to be aware of. Here are the comprehensive guidelines for designing your own postcards.

For your convenience, we offer free, downloadable templates for your team to use for this process on this page.

Postcard Size

Postcard Size Requirements & dimensions for first-class and marketing mail pricing

  • To get the low-cost First-Class Mail postcard pricing from the USPS, size matters. The size of your postcards should be between 3.5-4.25" high, 5-6" long, and .007-.016" thick.
     
  • If your mail pieces are larger than the First-Class mail allowance, you may still qualify for USPS Marketing Mail. These should be no larger than 6.125" high, 11.5" long, and .25" thick

    Anything larger than that will get pushed to the higher Large Flat rate. If you must go with a larger piece, you may want to consider folding your flat-sized piece to qualify for the Marketing Mail or First-Class Mail postcard pricing.

    Just make sure to check the thickness of the folded piece to ensure it's within the USPS’s guidelines and seal the open edges either with glue or tabs to prevent jamming in USPS machines.

Postcard Layout

  • When initially creating the image in your design software, make sure to use 300dpi. This ensures your final artwork will result in a professional-quality printed postcard with no blank areas.
     
  • Make margin and cropping allowances. In the example image below, you’ll see these as “Trimmed Card” and “Full Bleed” lines. This ensures your message is fully visible after the final cut.
     
    • Add a .125" bleed beyond the actual edge of the postcard size all the way around.
    • Keep any important images and messages in the design area  .25" in from the trimmed card.

Note also in the example image: to create an 8.5” x 5.5” jumbo sized finished postcard, create your artwork canvas at 8.75” x 5.75” to allow for the bleed area when uploading.

postcard layout and size example with margin and cropping allowance information

Other Items of Note

  • Use square corners for postcards going through the US Postal Service. The Post Office will not accept postcards for mailing if finished corners exceed a radius of 1/8". Anything larger will get rejected because they can jam their machines.
     
  • If you like the look of postcards with rounded corners, we recommend using them to hand out in person, in advertising kiosks, or when put into envelopes
     
  • Odd-shapes and sizes can create issues for USPS machinery so if your custom pieces must be processed manually, you'll pay a nonmachinable surcharge for each piece. Contact the USPS for details on this type of surcharge.

Download our free templates to help ensure your mail pieces are within USPS guidelines. For detailed information on how to design each different size postcard for use with QuantumDigital's Real Estate Direct Mail services, see our support article "Designing & Uploading a Direct Mail File"