4.25x5.5 Flat Cards

Matching Envelopes for 4.25x5.5 Flat Cards

Pair your A2 flat cards with our Matching Envelopes, sized automatically to fit your card order. Choose from three classic colors:

• White — Clean, classic, and versatile. Pairs with any card design.
• Natural — Soft off-white with a warm, refined tone. Popular for weddings and elegant events.
• Kraft — Earthy brown craft paper finish. A favorite for rustic, vintage, and modern designs.

Envelopes are sold separately as an add-on so you can choose the color that fits your design. Add Matching Envelopes to your cart along with your card order — we'll size them to match automatically. Volume pricing is available, with the cost per envelope decreasing as quantity increases.

Best Uses for 4.25" x 5.5" Flat Cards

• Save-the-Dates: Perfect for announcing weddings, parties, or special events.
• Invitations: Ideal for casual or formal events like dinner parties, showers, or gatherings.
• RSVP Cards: Great for collecting responses from guests with ease.
• Announcements: Birth announcements, graduation, or milestone events.
• Thank You Cards: Send a personal note to express appreciation for gifts, attendance, or support.
• Business or Personal Notes: Professional or personal messages that need a polished, hand-delivered touch.
• Event Reminders: Handy for mailing reminders for meetings, fundraisers, or community events.
• Packaging Inserts: A favorite size for small businesses adding branded thank-you cards or care instructions to shipped orders.

Quick tip: Choose 4.25x5.5 flat card printing when you want a single-panel card with a clean, polished design. Choose folded greeting cards when you want interior writing space for longer messages.

Flat Card vs. Folded Greeting Card

The 4.25x5.5 size is available in both flat and folded formats. Here's how to decide:

• Flat cards (this product): Single-panel cards with no fold. Best when the design is the focal point — save-the-dates, announcements, RSVPs, and packaging inserts where you want a clean, finished look.
• Folded greeting cards (A2 size): Double-panel cards with a center fold and interior writing space. Best for traditional greeting cards, thank-you notes, and event invitations where recipients expect to open the card and find a message inside.

Choosing the Right Flat Card Size

Our flat cards come in multiple sizes to fit different uses:

• 3.5x5 Flat Cards — Our most compact flat card size. Best for RSVPs, enclosure cards, mini art prints, and packaging inserts.
• 4.25x5.5 (A2) Flat Cards — The classic mid-size flat card. Ideal for save-the-dates, announcements, and small invitations.
• 5x7 (A7) Flat Cards — Our largest flat card size, perfect for full invitation suites, photo cards, and detailed designs.

Quick tip: Choose 4.25x5.5 (A2) when you want a card that's larger than a small enclosure but more affordable to print and mail than a full 5x7. It's the most popular middle-ground size for stationery suites.

4.25x5.5 (A2) Flat Card FAQ

What is an A2 flat card?

A2 refers to the 4.25" x 5.5" card size. The "A2" designation comes from the standard envelope size used to mail these cards (A2 envelopes measure 4.375" x 5.75"). Flat A2 cards are single-panel, while folded A2 cards have a center fold with interior writing space.

What size envelope does a 4.25x5.5 flat card need?

A2 flat cards fit standard A2 envelopes (4.375" x 5.75"). When you add our Matching Envelopes to your cart, we automatically pair the right envelope size with your card order — you only choose the color.

Can I print on both sides of the card?

Yes — our 4.25x5.5 flat cards are printed in full color on both sides. Many customers use the front for design or branding and the back for additional information, RSVP details, or contact info.

Are A2 flat cards good for save-the-dates and RSVPs?

Yes — the A2 flat card is one of the most popular sizes for save-the-dates, RSVPs, and stationery suite inserts. The size pairs naturally with 5x7 (A7) main invitations, creating a coordinated wedding or event invitation set.