An 18th or 21st birthday envelope with the embarrassing photos in it.

The big one. Loud envelope, honest letter. Write the letter, add the photos, and a film if there’s one to send, so they can hear you say it. Pay once and send the link. They open it on their screen, like the real thing.

Start an envelope

18th or 21st envelope: what goes inside

A letter

Advice they’ll ignore now and quote in ten years, and the thing you’d never say at the party.

Dear Kit, Eighteen. Here are three rules. You will break two.

A postcard

The most embarrassing photo you have. Then a better one, so it’s fair.

Your first haircut you chose yourself. Brave.

A film

Everyone who’s watched them grow up, forty seconds each, best stories only.

3:20 · Twenty-one years, abridged

How it works

Fill the envelope with a letter, postcards and a film — any mix, up to ten pieces, and one price for the whole envelope by what's inside. Pay once, by card. Send the link now, or keep it sealed until the day: no app to install, it opens on any phone, and it's kept for good.

18th or 21st envelope questions

Can I put money or a voucher in it?

Not money itself, but you can put a voucher code in the letter, or a photo of the present on a postcard, and let the envelope do the reveal.

Can it open at midnight?

Yes. Set it to open at midnight on the day, and they’ll see a countdown until then.

How much does it cost?

$1.29 for letters and postcards, $5 with a film. One price for the whole envelope, up to ten pieces, paid once by card through Stripe. No subscription.

Do they need an app?

No. One link, opened in the browser on any phone, tablet or computer. They tap the seal and the envelope opens.

When should I send it?

Whenever you like. Send the link straight away, or send it now and set the day and time it opens — until then they’ll see the sealed envelope and a countdown.

Can I change it after I’ve paid?

Until they open it, yes. Sign in with the email you paid with and change what’s inside; the link stays the same. You can’t add anything that costs more than you paid, and once they’ve opened it, it stays as it is.

How long does it last?

For good. They can open it as many times as they like. A film is kept for a year after it’s first opened, and they can save their own copy.

More like this

Say it properly.

Five minutes to write. One payment. One link they’ll open more than once.

Start an envelope