What to write in a birthday card for your sister
A sister has known you your whole life, so skip the generic and make her card as real as she is. A shared memory or in-joke beats any shop-bought line.
Happy birthday to the sister who knows all my secrets and loves me anyway. Lucky doesn't cover it.
This is what they receive
Your words on a real birthday card: it opens with an animation, and your photo, voice note or video if you add one. Free, no account, no watermark.
Send this one as a card →Birthday messages for your sister
We've shared a childhood, a thousand arguments and a whole lot of love. Happy birthday, sis.
Happy birthday to my built-in best friend. Here's to another year of being ridiculous together.
No one gets me like you do. Have the best birthday, sis — you more than deserve it.
Happy birthday to my favourite partner in crime. The world's lucky to have you; I'm luckier still.
How it works
Free · No account · Ready in a minute · No watermark
Pick a message
Tap any example above and it lands on the card. Change a word or two so it sounds like you.
Choose a design
Add their name, a photo, a voice note or a short video if you like. Everything stays free.
Send it anywhere
By email on the day you choose, as a WhatsApp link, or as an image. They open it with an animation.
Want to add a gift?
Going in on it together? Attach an experience gift to a group card and everyone chips in their share as they sign — €100 split eight ways is about €13 each. They pick the experience; the price stays private.
Make it your own
Add a name and a detail or two — the AI writes three you can use in seconds, free.
Christmas is coming — what will you write?
Messages for the cards you'll send in December, ready to copy or send as a card.
Questions
What do you write in a birthday card for your sister?
A sister has known you your whole life, so skip the generic and make her card as real as she is. A shared memory or in-joke beats any shop-bought line. The strongest messages name one specific, true thing about them and say plainly how you feel — keep it short and it lands harder.
How long should a birthday message be?
One to three sentences is plenty. A short, specific line beats a long, generic paragraph — people remember the detail, not the word count.
Say it to Sister in their language
The phrases natives use, and full messages by a native speaker — sent as a card in that language.
Found the words?
Put them on a card and send it free in a minute — no account, no watermark.