Standard postcard mailer size

The standard postcard mailer size is typically 4 inches wide by 6 inches long (4" x 6"). This size is commonly used for postcards, greeting cards, and other types of mailers that need to fit in a standard mailbox.

Here are some key dimensions to note:

Keep in mind that these dimensions are not set in stone, and some postcard designs may vary slightly depending on the specific use case or printing requirements. However, the 4" x 6" size is generally considered the standard for postcards and is widely accepted by the postal service.