Wedding Invitation Size Guide: Paper Dimensions and Digital Screens

A wedding invitation size guide explains how paper dimensions are measured, which card fits which envelope, and how those same layouts behave once they move onto a phone screen. Most couples start with the invitation wording and end up choosing a size last, which is exactly backwards. Knowing the numbers first keeps the design, the envelope, and the postage from fighting each other.

• A7 measures 5 by 7 inches and is the standard US wedding invitation size, pairing with A7 envelopes at the regular letter rate.
• Square and oversized envelopes are handled by hand in the US mail system, which adds a non-machinable surcharge to the normal postage.
• Digital invitations replace fixed paper sizes with aspect ratios, so one link can render as a tall 9:16 phone layout or a wide desktop view.

You can browse invitation themes by mood and color to see how a layout sits on different proportions.

What Are the Standard Wedding Invitation Sizes?

The most common wedding invitation size in the US is A7, which measures 5 by 7 inches and fits a matching A7 envelope without special mailing.

A7 sits at the top of the list for good reason. It gives you room for full names, the date, the venue, and a short dress code line without crowding the sheet. Stationery shops, printers, and envelope makers treat it as a default, so matching pieces stay easy to find.

Below it, the A2 card at 4.25 by 5.5 inches is the classic response card size. A1, at 3.5 by 4.875 inches, usually carries directions, a website note, or a small details card. These smaller formats travel inside the same envelope as the main invitation.

A6, about 4.6 by 6.25 inches, often shows up as a save-the-date or a thank-you note. It feels substantial in hand yet still follows standard mailing rules. If you want one size that covers the invitation and every insert, A7 remains the safest starting point.

Square, Slim, and Oversized Invitations

Square, slim, and oversized invitations each carry a distinct look, but their shapes change the envelope you need and what mailing costs.

A square invitation, usually 5.5 by 5.5 or 6.5 by 6.5 inches, photographs beautifully and reads as modern. The trade-off is the envelope. Square envelopes are not machine-sortable in the US, so the postal service handles them by hand and adds a non-machinable surcharge on top of the regular rate.

Slim cards, often 4 by 9 inches, offer an elegant, elongated shape. They can also push past the standard letter size, which means a larger envelope and a higher rate. Check the current mail rules before you fall in love with a shape.

Oversized invitations such as 6 by 9 inches make a statement for black-tie events. They often need flat mailing rather than folding, and that changes both the envelope and the postage. For a small guest list the extra cost is easy to justify; for a large one it adds up fast.

How Do You Match Envelopes to Your Invitation Size?

An invitation size only works if its envelope matches, and the envelope number tells you what fits inside.

Envelopes are sold by the same A-numbers as the cards they hold. An A7 envelope takes a 5 by 7 card with a little breathing room; an A2 envelope takes a 4.25 by 5.5 response card. Buy them together whenever you can.

Outer envelopes usually run one size up from the inner envelope, which lets you tuck the invitation and its inserts without bending a corner. If you plan to add a belly band, a wax seal, or a ribbon, allow a bit more room. Thick embellishments can make a folded invitation too bulky for a standard envelope.

Weigh a finished sample at the post office before you print the full run. One extra insert or a heavier paper stock can push the envelope into the next weight bracket. A single early trip saves a costly reprint later.

Choosing a Size Based on Wording and Design

Pick your invitation size by counting the words you need to print and the blank space you want around them.

Write the wording first, then choose the card. A short ceremony line and a reception note fit comfortably on a 4 by 6 or A2 card. Full names, parents' names, venue address, dress code, and a reply deadline need the wider field of a 5 by 7.

White space is part of the design, not leftover room. A script font that looks lovely on a screen can swallow a small card, so leave at least a quarter inch of margin on every side. If the text feels tight, the size is wrong, not the font.

Think about how guests will use the card. Some people clip invitations to the fridge; others photograph them and save the image. Larger cards read well across a room, while smaller ones suit a clean, minimal look. You can browse invitation themes by mood and color to see how a layout sits on different proportions.

Do Digital Invitations Have a Fixed Size?

Digital invitations do not have a fixed size, so aspect ratio and how the layout reflows on a phone matter more than inches.

Onlivita invitations are built for screens, which removes most of the printing math. There is no paper to cut, no envelope to match, and no postage bracket to check. The RSVP form, the countdown, the map, and the music all open from one link your guests tap.

What replaces inches is aspect ratio. A tall 9:16 layout suits a phone held upright, which is how most guests will open the link. A square 1:1 layout works well for a social post or a messaging app preview. Wide formats read better on a desktop screen.

Because the layout adjusts to the device, text stays legible whether someone opens the invitation on a small phone or a large monitor. You can also update the details after sending, which printed cards cannot do. A venue change or a time shift reaches everyone through the same link.

Proofing a Size Before You Commit

Before ordering a full print run, proof the size against real paper, real envelopes, and a real postage scale.

Print one copy at full size and fold it the way guests will. Drop it into the envelope, add every insert, and seal it. Small problems show up fast this way: a card that catches on the flap, a seal that bulges, an insert that slides out when the envelope opens.

Check bleed and margins on the file as well. Printers trim paper in stacks, and a fraction of an inch of drift is normal. Keep text at least a quarter inch from the edge so a slightly off-center cut never clips a name or a date.

Compare paper stocks in your hand, not on a screen. A heavier sheet feels formal and holds an impression from letterpress, while a lighter one suits a casual celebration. Order samples before you commit to hundreds of cards, and keep your wording flexible until the sample arrives.

For a format that ignores paper sizes altogether, a special occasion invitation opens in the browser and carries the RSVP, map, and music inside one link.