Gabriel Ideas Written by Gabriel

Top 5 Most Common Postcard Sizes: A Definitive Guide

By Gabriel Aug 06, 2026
Designers Toolbox Postcard Sizes and Guidelines
Designers Toolbox Postcard Sizes and Guidelines

The art of sending postcards remains a beloved tradition, with a rich history dating back to 1840. Today, postcards are no longer just pieces of communication; they're collectibles, pieces of art, and windows into cultures from around the world. Central to the postcard experience is its size, which often impacts its design, function, and value. Let's explore the most common postcard sizes and their unique characteristics.

Designers Toolbox Postcard Sizes and Guidelines
Designers Toolbox Postcard Sizes and Guidelines

Postcard sizes vary by country and region, with some nations having multiple standard sizes. However, there are a few international standards that are widely recognized and used. The two most common of these are the International Postcard Size and U.S. Postcard Size. Let's dive into these, and other lesser-known but interesting sizes.

a diagram showing the size and width of a standard postcard size card, with measurements for each side
a diagram showing the size and width of a standard postcard size card, with measurements for each side

The International Postcard Size

The international standard for postcards, as defined by the Universal Postal Union, is 105mm × 235mm (4.13" × 9.25"). Also known as the 'postcard size EU,' this is the most widely used and recognized size in countries across Europe, South America, and Asia.

The Ultimate Guide to Postcard Sizes & Dimensions (2026)
The Ultimate Guide to Postcard Sizes & Dimensions (2026)

This size allows for ample space to include a vivid photograph, artwork, or graphic design, along with messages and addresses. Its standardization ensures seamless international delivery, making it the preferred choice for global correspondence and promotions.

Variations in Europe

the standard size bus card is shown in white and has four different numbers on it
the standard size bus card is shown in white and has four different numbers on it

While the international standard is widely accepted, some European countries have their own slightly varying sizes:

  • In Germany, Austria, and Switzerland, the official size is 105mm × 148mm (4.13" × 5.83").
  • Italy and Vatican use 100mm × 148mm (3.94" × 5.83").

Other International Variations

The Basics Archives - Go Make Something
The Basics Archives - Go Make Something
  • Australia: 138mm x 210mm (5.43" x 8.27")
  • Japan: 102mm x 148mm (4.02" x 5.83")
  • India, Pakistan, and Sri Lanka: 125mm x 206mm (4.92" x 8.11")

U.S. Postcard Size

The United States Postal Service (USPS) has its own size standards, which are slightly larger than the international standard. A standard U.S. postcard measures 91mm (3.58") in width and 152mm (5.98") in length. This size is also used in Canada, Mexico, and some Caribbean countries.

Standard Postcard Sizes: How to Choose the Right One
Standard Postcard Sizes: How to Choose the Right One

While USPS allows for some variation (92mm to 155mm in width and length), most U.S. postcards conform to the standard size. This size is appreciated for its manageability and ability to display unique designs and messages.

Standard U.S. Sizes for Specialty Cards

Free Printable Blank Postcard Templates [PDF Included]
Free Printable Blank Postcard Templates [PDF Included]
the size and height of an apartment building with measurements for each floor area in front of it
the size and height of an apartment building with measurements for each floor area in front of it
four postcard templates with the words business name and address on each one side
four postcard templates with the words business name and address on each one side
What size is a postcard
What size is a postcard
Malaysia Postcard - Chetti Melaka
Malaysia Postcard - Chetti Melaka
Paper size guide - Never be confused by paper sizes again!
Paper size guide - Never be confused by paper sizes again!

In addition to the standard U.S. postcard size, USPS also recognizes two other sizes for specialty postcards:

  • Large Mailer: 115mm (4.53") in width and 235mm (9.25") in length.
  • Publication Size Mailer: 102mm (4.02") in width and 235mm (9.25") in length.

Whether you're sending greetings, news, or just a Hello, understanding common postcard sizes can help you find or create the perfect postcard for your message. So, go ahead, strike that pose, take that picture, design that artwork - the world's waiting to hear from you... one postcard at a time!