The size of a postcard can vary depending on the country and postal service. In the United States, the standard size for a postcard is 4 inches by 6 inches (10.16 cm by 15.24 cm). However, postcards can also come in other sizes, such as 5 inches by 7 inches (12.7 cm by 17.78 cm) or 3.5 inches by 5 inches (8.89 cm by 12.7 cm).

In Europe, the standard size for a postcard is typically slightly larger, with dimensions of 4.13 inches by 5.83 inches (10.5 cm by 14.8 cm) or 4.72 inches by 6.69 inches (12 cm by 17 cm).

It is important to note that different postal services may have different regulations and requirements for postcard sizes, so it is always a good idea to check with the relevant postal service before designing and sending postcards.

In order to create your own postcard design, it is important to figure out in prior the region you are living in and the style of design you want. Hiring a freelance postcard design service at papmall® would be a good choice since you will have a professional designer to handle the whole process for you, from the beautiful design, the theme, the color scheme, the font of the text, and the size of the postcard. Not to mention, the platform also has a quality check policy to make sure you can get what you are asking for.