Postcard specs define the physical and technical parameters that determine how a mailpiece is printed, handled, and delivered. Understanding these specifications is essential for marketers and small business owners who want to ensure their direct mail pieces arrive looking professional and within budget. From weight and thickness to finish and size, every detail plays a role in the success of a campaign.
Standard Postcard Dimensions
The most common postcard specs align with standard mailer sizes approved by postal authorities. A typical full-color postcard measures 4.25 inches by 5.5 inches, which is the most economical size for bulk mailing rates. However, providers also offer variations such as 5 inches by 7 inches for a more prominent canvas, or smaller 3.5 inches by 5 inches cards that fit easily into wallets. It is important to note that any card exceeding the standard letter size regulations will be subject to higher postage fees, so designers must always confirm the final trimmed dimensions before sending to print.
Paper Weight and Thickness
Postcard specs regarding paper weight directly impact the perceived quality and durability of the mailpiece. Most standard postcards use 14 pt to 16 pt cardstock, which provides a sturdy feel without excessive bulk. For a premium look, marketers often choose 20 pt to 24 pt stock, which feels rigid and substantial in the hand. The weight is usually measured in pounds (lbs) or grams per square meter (GSM), with 65 lb to 80 lb stock being the industry sweet spot for balancing quality and cost efficiency.
Coating and Finish Options
The finish of a postcard affects both its visual appeal and its resistance to wear during transit. Aqueous coating provides a subtle sheen and protects against fingerprints and minor scuffs, making it a popular choice for high-end retail campaigns. For a glossy, vibrant look, UV coating is applied and cured with ultraviolet light, creating a hard surface that makes colors pop. Matte finishes offer an elegant, sophisticated aesthetic that is ideal for luxury brands, while soft-touch coatings deliver a velvety texture that feels premium to the touch.
Bleed and Safety Margins
Professional postcard specs always include guidelines for bleed and safety margins to ensure the final product looks exactly as designed. A bleed area of 0.125 inches around all edges allows the printer to run the card to the very edge of the card without leaving unsightly white borders. Critical elements such as text, logos, and call-to-action buttons must remain within a 0.25-inch safety margin to prevent them from being cut off during the trimming process. Ignoring these specs can result in awkward gaps or cropped imagery that damages the brand image.
Image Resolution and Color Mode
To achieve sharp, high-quality prints, postcard specs require a high resolution for all visual assets. Images must be saved at 300 dots per inch (DPI) at the final output size to avoid pixelation. Designers must also configure their files in CMYK color mode rather than RGB, as CMYK aligns with the four-color printing process used by commercial printers. Failing to convert colors accurately can result in muted tones or unexpected shifts that misrepresent the brand’s identity.
File Formats and Submission Requirements
Printers typically prefer vector files for text and logos because vectors scale without losing clarity. Accepted formats usually include PDF, EPS, or AI files for complex designs, while high-resolution TIFFs or JPEGs are suitable for photographic imagery. When preparing files, designers should flatten layers, embed all fonts, and convert strokes to outlines to prevent errors during the RIP (Raster Image Processor) stage. Adhering to these technical postcard specs minimizes the need for reprints and ensures a smooth production cycle.
