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Greeting Card Sizes Explained: Designer’s Guide to Standards

Greeting Card Sizes Explained: A Designer’s Guide to Standard & Boutique Formats

Whether you are launching your first Etsy shop or scaling a global stationery brand, choosing the right card size is about more than just aesthetics—it’s about postage costs, envelope availability, and "shelf presence."

At StationeryHQ, we see thousands of designs come through our San Jose facility. To help you avoid the "wrong size" headache, here is the definitive guide to greeting card dimensions and when to use them.

1. The Industry Standards: A-Series Sizes

The "A" in A-size stands for "Announcement." These are the most common sizes in the US and are designed to fit perfectly into standard envelopes.

A2 (4.25" x 5.5") – The "Everyday" Card

The A2 is the undisputed king of stationery. It is the perfect size for thank-you notes, "thinking of you" cards, and holiday sets.

  • Why it works: You can get four cards out of a standard 8.5" x 11" sheet, making it highly efficient for production.

  • The StationeryHQ Edge: Our 130# Matte Cover makes an A2 card feel like a luxury object rather than a flimsy note.

A6 (4.625" x 6.25") – The "Mid-Size" Choice

Slightly larger than the A2, the A6 offers more room for intricate illustrations or longer handwritten messages. It feels a bit more "substantial" in the hand.

A7 (5" x 7") – The "Gold Standard" for Occasions

If you are designing wedding invitations, birthday cards, or high-end greeting cards, the A7 is your go-to.

  • The Vibe: It has significant "shelf presence" in retail stores.

  • Postage: It still qualifies for a standard First-Class stamp (as long as it’s not too heavy or square).

2. The Boutique & Specialty Sizes

4-Bar (3.5" x 4.875")

Often used for RSVP cards or small "enclosure" notes. It is the smallest size allowed by the USPS for mailing on its own.

Square Cards (e.g., 5" x 5" or 6" x 6")

Square cards are modern, chic, and instantly stand out in a stack of mail.

  • The Catch: The USPS hates them. Because they cannot be processed by standard sorting machines, they require extra postage.

  • The Move: Use square cards for high-end luxury sets where the customer expects a premium experience.

No. 10 / Slimline (3.875" x 9.25")

Commonly known as "Business Envelope" size, this long, slender format is trending for modern holiday cards and formal dinner invitations.

3. Flat vs. Folded: Which should you choose?

  • Flat Cards: Best for invitations, postcards, or announcements. They are sleek and cost-effective.

  • Folded Cards: The classic choice for greeting cards.

    • Pro Tip: At StationeryHQ, we use the Horizon CRF-362 creaser to ensure that even our thickest 130# stock folds with a crisp, clean edge and zero "cracking" on the spine.

4. The "Pro-Designer" Checklist

Before you hit "Upload," check these three things:

  1. The Bleed: Always include a 0.125" bleed on all sides. If your card is 5" x 7", your file should be 5.25" x 7.25".

  2. The Margin: Keep your text at least 0.25" away from the trim line to avoid a "crowded" look.

  3. The Paper: Don't settle for 100# or 110# cardstock. To stand out on Etsy or in a boutique, you want the "thud" factor of 130# Uncoated Matte.

Ready to Print?

Whether you're doing a short run of 25 cards or a wholesale order of 5,000, StationeryHQ is built for the professional designer. Our HP Indigo presses ensure your colors are vibrant, and our San Jose team treats every order like a work of art.