20% off all cards with code BOO
20% off all cards with code BOO
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21

By Alison Hardcastle

As low as $1.70
30 cards for $138 $110
View price tiers See card details

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Automated Birthday Cards

Send this card to all of your automated birthday card recipients.

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4.7 on Google (9000+)
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Card Information

21

Description

Celebrate the milestone 21st birthday with this vibrant card featuring bold numbers in yellow and red against a dynamic blue background with wavy patterns. Perfect for marking this special occasion with a splash of color and style. Send your birthday wishes with ease as Postable can mail it directly for you.

Dimensions

5.5" x 4.25"

Paper quality

Mohawk paper with a matte vellum finish
100lb paper weight for cards and 70lb for envelopes
100% post consumer recycled

Pricing Tiers

20% off all cards with code BOO

Quantity Price with discount
1-19 $4.23 ea
Best value starts here
20 $91.80 $73.44 ($3.67 ea)
30 $137.70 $110.16 ($3.67 ea)
40 $183.60 $146.88 ($3.67 ea)
50 $229.50 $183.60 ($3.67 ea)
60 $275.40 $220.32 ($3.67 ea)
70 $321.30 $257.04 ($3.67 ea)
80 $367.20 $293.76 ($3.67 ea)
90 $413.10 $330.48 ($3.67 ea)
100 $459.00 $367.20 ($3.67 ea)

For larger orders try our volume pricing calculator

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Meet Alison Hardcastle

Yorkshire, UK

Alison Hardcastle is a cards, stationery and paper goods studio based in the Yorkshire Wolds, UK. The bold colourful designs feature hand painted illustrations and lettering and are illustrated by Alison in her quiet little country studio. Founded in 2005 and born out of a passion for illustration, typography, screen printing and the giving and receiving of beautifully thoughtful well-designed and carefully chosen cards and stationery.

View artist's cards

Alison Hardcastle is a cards, stationery and paper goods studio based in the Yorkshire Wolds, UK. The bold colourful designs feature hand painted illustrations and lettering and are illustrated by Alison in her quiet little country studio. Founded in 2005 and born out of a passion for illustration, typography, screen printing and the giving and receiving of beautifully thoughtful well-designed and carefully chosen cards and stationery.

View artist's cards

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Once you add up all of our competitors’ hidden charges, we’re actually a better value. Have a look.

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Free addressing and mailing
Free 100% recycled paper
Free color envelopes
Free return addressing
Free images on the back
No hidden upcharges
No wrist and tongue injuries

Reviews

Postable is rated 4.7 out of 5 stars based on 5,541 customer reviews.

4.7

Based on 5,541 reviews
5
84%
4
7%
3
4%
2
2%
1
3%

FAQs

When should I order birthday cards to arrive on time?
Birthday cards usually take about a week from order to delivery. To be safe, order at least a week in advance or schedule with Postable so your card arrives right around their birthday.
What do you write in a birthday card?
A cheerful “Happy Birthday” always works, but the fun is making it personal. Add a funny memory, an inside joke, or a heartfelt wish. Postable makes it easy to create birthday cards that feel extra special.
How can I send a birthday card online?
The easiest way is with Postable. Just pick a card, type your message, and add the address. Postable prints, stamps, and mails it straight to their door so you look thoughtful without the last-minute scramble.
Can you add a photo to a birthday card?
Yes. With Postable, many birthday card designs let you upload a photo, whether it’s a goofy selfie, a favorite throwback, or a family snapshot. Postable makes it simple to create a birthday card that feels personal and memorable.
Who has eco-friendly birthday cards?
Postable has eco-friendly birthday cards printed on 100% recycled paper. You can celebrate someone’s big day with a card that looks great while also being kind to the planet. Postable makes sending sustainable cards simple and fun.
How can I schedule birthday cards in advance?
With Postable, you can write your message today, pick the date, and we’ll print, stamp, and mail your card when the time comes. Scheduling ahead with Postable means birthdays never get missed.
Can businesses automate birthday cards for clients and employees?
The best way is with Postable. You can upload your mailing list and use Postable’s automated birthday card tool to schedule cards for the whole year, making it easy to celebrate clients and employees without missing a date.
What kinds of birthday card designs does Postable offer?
Postable has tons of unique birthday card designs created by independent artists. From funny to heartfelt to photo cards, there’s a style for everyone, and sending birthday cards with Postable is effortless.

Have more questions? Check out our extended FAQs.