What Size Is a9 Envelope?

Find out what size an A9 envelope is and how to properly address one.

Checkout this video:

Standard A9 Envelope Size

An A9 envelope is typically used for wedding invitations. It is a standard size envelope, measuring 5 3/4 inches wide by 8 3/4 inches long. These dimensions make it slightly smaller than a standard A4 sheet of paper, which is 8.27 inches wide by 11.69 inches long.


An A9 envelope is the smallest standard-sized envelope that you can buy. It measures 5 3/4 inches wide by 8 3/4 inches long. This size is typically used for enclosing RSVP cards for weddings and other events, as well as small invitations.

Common Uses

The A9 size envelope is perfect for enclosing a 4-1/8 x 5-1/2″ card or invitation. This is a very popular size for wedding and baby announcements, as well as save-the-date cards. A9 envelopes can also be used for marketing purposes to mail smaller postcards or product samples.

Custom A9 Envelope Size

The standard size for A9 envelopes is 5 3/4″ x 8 3/4″. This is the perfect size for enclosing an A9 card, which is 5 1/2″ x 8 1/2″. If you need a custom size for your A9 envelopes, we can help you with that too. Just let us know what you need and we’ll get it done.


The A9 size is one of the most popular envelope sizes for greeting cards, as it fits a standard card size. Although the dimensions can vary slightly depending on the manufacturer, an A9 envelope is typically 8.5 inches wide by 5.75 inches tall. This makes it slightly smaller than an A8 envelope, which is 9 inches wide by 6 inches tall.

Common Uses

While a9 envelopes are not as commonly used as some other envelope sizes, they do have a few key uses. Here are some of the most popular:

-Invitations: Because of their small size, a9 envelopes are often used for invitations, greeting cards, and other similar items.

-Business Mail: These envelopes can also be used for business mail, such as marketing materials or invoices.

-Personal Mail: In addition to business mail, a9 envelopes can also be used for personal mailings like thank you cards or love letters.