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Send 21^st birthday cards online

Create a stylish 21st birthday e-card in seconds.
Invite friends & family to add messages, voice notes, photos & videos.
Add a collection for a present in one click.

Get started in 1 minute. Pay only when you're ready to send.

Create a Thankbox View example

William, you can legally raise a glass so let’s toast to you! 🥂🎉

Mike

Sample message image for message from Tom

21 today, legend tomorrow! 🎂🍾 Have a blast!

Tom

Hope your birthday is as amazing as you are! Enjoy your special day! 💖

Benny

Sample message image for message from Liz

Officially 21! Here’s to new adventures, endless possibilities, and celebrating life to the fullest. Have the best birthday yet! ⭐️🥳

Liz

Celebrating thousands of birthdays daily in organisations, including

Hundreds of card designs to choose from

Get started with our example cards or make your own

Choose your own design

delighted customers

of gifts issued worldwide

messages posted to happy recipients

How Thankbox 21st Birthday Ecards Work

Create

It takes one minute to create & personalise a 21^st digital birthday card with Thankbox. Select from hundreds of designs or add your own.

Invite everyone, anywhere to add their birthday message. Share your unique link in your favourite chat app and watch the messages pour in.

Send

Schedule to deliver on the date. If you’ve added a gift collection, they'll get to choose digital gift card, too.

How it works

Your messages, perfectly presented

Your 21^st birthday card will look fabulous, regardless of how many messages it has. Choose between two great layouts to perfectly match the occasion.

Board layout

Send a wall of love to them on their 21^st. The board layout is best for large groups with lots of messages.

Card layout

A traditional birthday ecard with a modern twist. Ideal for celebrating birthdays within a smaller group. Great for a heartfelt 1-to-1 card as well.

Create a Thankbox

Board layout

Send a wall of love to them on their 21^st. The board layout is best for large groups with lots of messages.

Card layout

A traditional birthday ecard with a modern twist. Ideal for celebrating birthdays within a smaller group. Great for a heartfelt 1-to-1 card as well.

Create a Thankbox

Make their 21st birthday feel extra special

Get everyone involved

With a Thankbox group card anyone, anywhere in the world can add their message instantly. And with no limits - your group can be tens or thousands.

Make it stand out

Every Thankbox birthday card is unique. With hundreds of designs and multiple message customisations available, everyone can add real colour and personality to their birthday wish.

Set to arrive on the day

Schedule it to arrive exactly on their 21^st birthday. Or send it when you're ready. It’s 100% up to you.

It's the planet-friendly choice

With an online 21^st birthday card, there’s no plastic, paper or CO₂ emissions. We even plant a tree for every 10^th Thankbox sold.

Make an effort, effortlessly

Everyone can be themselves when contributing to a Thankbox digital birthday card. Write what you like and as much as you like - recall memories and add your own photos, videos or voice notes.

Birthday gift included

Send a gift together with your 21^st birthday card. Adding a collection for digital gift card takes seconds. You can then collect contributions from everyone.

The simplest way to make birthdays special

No matter if they're turning 21, 50 or 100 - celebrate them in style with Thankbox

20th Birthday cards 50th Birthday cards 60th Birthday cards 70th Birthday cards 80th Birthday cards 90th Birthday cards 100th Birthday cards

Your complete celebration platform for all birthdays

For those extra special birthday wishes - share your funniest & heartfelt messages in a video or voice recording attached to your Thankbox message.

See video messages
Send email invites to everyone you want to contribute to the birthday card. Set a closing date and anyone who hasn’t added a message in time will get an automatic nudge.

See birthday reminders
For more personal birthday wishes you can make sure your message is seen only by the recipient by marking it private.

See private messages
Surprise the 21^st birthday star with a wonderful gift hamper or bouquet alongside their Thankbox. All sourced responsibly and to the highest quality. Gifts can be purchased using the Thankbox collection pot.

See flower ordering

Video & audio wishes

For those extra special birthday wishes - share your funniest & heartfelt messages in a video or voice recording attached to your Thankbox message.

See video messages

Automatic invites

Send email invites to everyone you want to contribute to the birthday card. Set a closing date and anyone who hasn’t added a message in time will get an automatic nudge.

See birthday reminders

Private messages

For more personal birthday wishes you can make sure your message is seen only by the recipient by marking it private.

See private messages

Send gifts & flowers

Surprise the 21^st birthday star with a wonderful gift hamper or bouquet alongside their Thankbox. All sourced responsibly and to the highest quality.

Gifts can be purchased using the Thankbox collection pot.

See flower ordering

Your mighty birthday card that goes the extra mile

Setup your 21^st birthday Thankbox in one minute and start collecting messages & contributions. You can split the cost with everyone and pay from the gift collection pot.

For more info, visit our pricing page.

Get started for FREE and only pay when you're ready to send.

Classic Thankbox $5.99

Birthday cards and gifting made easy. Fast. Simple. Personal.

Unlimited messages
Add photos & GIFs
Scheduled sending
Collection pot included
No account required

Create Thankbox

Image of a recipient claiming their Thankbox gift, showing the diffent options they can choose.

Collect for an 21st birthday gift

With birthday card from Thankbox you can collect money for a group gift in one click. Everyone can add to the collection pot when they write their birthday wish. You can even cover the cost of the card from the collection. That’s fair.

Digital gift cards

The Thankbox recipient can redeem the collected amount for a digital gift card. Birthday present sorted! We have thousands of stores to choose from.

Send gifts

Users in the UK can easily add flowers and gift hampers to their Thankbox and have them delivered together with the card.

Create Thankbox How gift collections work

Digital gift cards

The Thankbox recipient can redeem the collected amount for a digital gift card. Birthday present sorted! We have thousands of stores to choose from.

Send gifts

Users in the UK can easily add flowers and gift hampers to their Thankbox and have them delivered together with the card.

Create Thankbox How gift collections work

Send the ultimate 21st birthday card now

Get started in seconds. Invite friends, family, or colleagues from anywhere to leave heartfelt messages. Add a gift collection and make their big day even more memorable!

Create a Thankbox

Try it now

Create your Thankbox in seconds - no need to register.
Only pay when you're ready to send it.

Create a Thankbox

Send 21st birthday cards online

Celebrating thousands of birthdays daily in organisations, including

Hundreds of card designs to choose from

Get started with our example cards or make your own

How Thankbox 21st Birthday Ecards Work

Create

Share

Send

Your messages, perfectly presented

Board layout

Card layout

Board layout

Card layout

Make their 21st birthday feel extra special

Get everyone involved

Make it stand out

Set to arrive on the day

It's the planet-friendly choice

Make an effort, effortlessly

Birthday gift included

The simplest way to make birthdays special

Your complete celebration platform for all birthdays

Video & audio wishes

Automatic invites

Private messages

Send gifts & flowers

Your mighty birthday card that goes the extra mile

Collect for an 21st birthday gift

Digital gift cards

Send gifts

Digital gift cards

Send gifts

Send the ultimate 21st birthday card now

Try it now

Send 21^st birthday cards online