Selecting the right postcard size for bulk mailing affects visibility, postage cost, and overall campaign success. TPSi’s HP Indigo 15K press supports a wide range of postcard sizes and materials, offering offset-level print quality even on premium 24 pt stock. This flexibility allows you to choose dimensions that best align with your marketing goals and budget.
Standard Postcard Sizes
USPS defines a standard postcard as being at least 3.5 inches high by 5 inches long and no more than 4.25 inches high by 6 inches long. These sizes qualify for the lowest First-Class Mail postcard rate. For bulk mailings, slightly larger 'letter-size' postcards—up to 6.125 by 11.5 inches—can be used under Marketing Mail for greater visual impact.
EDDM Sizes and Standards
Every Door Direct Mail (EDDM) allows for larger formats designed to stand out in the mailbox. EDDM-compliant postcards must be at least 6.125 inches by 10.5 inches and no more than 12 inches by 15 inches. TPSi provides EDDM as a standard service, handling all USPS preparation and entry requirements to ensure compliance and cost efficiency.
Balancing Cost and Impact
Larger postcards attract more attention but come with slightly higher printing and postage costs. Smaller cards are less expensive but may get overlooked. TPSi’s HP Indigo 15K press allows cost-effective production at any size, maintaining consistent color and sharpness even on thicker materials.
Design Considerations for Large Formats
When designing larger postcards, allow for safe zones and address clearances as required by USPS. TPSi’s seven-ink printing system (CMYK plus three spot colors including white) enhances creative flexibility, allowing high-contrast visuals and accurate brand reproduction across all postcard sizes.