A card is a small journey
Few things travel the world as quietly as a postcard. It goes without an envelope, carrying a picture of somewhere real and a message written in a stranger's hand. That is the whole charm of Postcrossing — the free exchange where members send and receive postcards from people they have never met, all over the world. The loop is simple: you send a card, someone far away registers it, and a card from somewhere else finds its way back to you. This guide covers the sending side: how the exchange works, how to choose a card that means something, and how to get it ready for the mailbox without second-guessing yourself.
How Postcrossing works
The mechanics are deliberately small. You request an address from the site, and it gives you one — a real person somewhere, waiting for mail. You send that person a postcard, and written on the card is a unique code called the Postcard ID. When the card arrives, the recipient visits the Postcrossing website, enters the ID, and the card is registered. That registration closes the loop, and a card of your own is queued to come back to you: one card out, one card in.
Two things are worth knowing at the start. The ID matters more than anything else on the card — without it, the recipient cannot register your card. And the address the site provides is the one you write on the card; the website takes care of the matching on its side.
Postcrossing itself is free to join; the only real cost is the card and the postage. Each address arrives with the person's name and, usually, a short profile — a few lines about who they are and what they enjoy. Reading it is the polite first step, and the official guidance is simple: respect the profile, and copy the address exactly as it was given.
When your turn comes, the site hands your own address to another sender somewhere in the world — that is how the flow keeps moving, with everyone a sender and a recipient at once. There is nothing you need to do to receive: the same queue that carried your card out will carry one back.
Start with the card, not the message
The easiest mistake is to grab the first pretty card and worry about the message later. Do it the other way: choose the card first, and the message will almost write itself.
The cards that travel best are the ones that show somewhere real — not the glossy landmark everyone has seen, but a place the sender actually knows. A market square. A river at the edge of town. A trail into the hills. Old Route Retro is built around exactly that idea: postcards organized by the places they belong to. From the forest routes of the Alabama and the high desert of Arizona, to the Pacific light of California, the glacier country of Alaska, and the outback and reef coasts of Australia. The United Kingdom routes split by nation: England’s heritage routes, the highland lochs of Scotland, the castles of Wales, and the coastal cliffs of Northern Ireland.
A stranger in Osaka or Warsaw is not hoping for a postcard-shaped stock photo of your city. They are hoping for a small, honest window into somewhere they have never been. A card of your actual place is that window.
If the profile mentions a love of maps, trains, lighthouses, or waterfalls, a card from your place that touches that theme lands beautifully. The place still comes first — the profile simply points you at which corner of home to show.
Where everything goes on the back
The back of a postcard is small, so a simple layout makes it easier to read and process. Keep the message on the left, the address clearly separated on the right, and leave the stamp area clear in the top corner.
The Postcard ID needs a place where it cannot be missed — a corner away from the address is the usual choice. A quick check before mailing saves the recipient a smudged, unreadable code.
Before the card goes in the box, run the small checklist: message readable, address block complete and legible, stamp in its corner, ID clear in its corner. A card that is easy to read is a card that arrives and registers.
The Postcard ID
Every Postcrossing card carries a code, usually two letters followed by numbers, such as “US-123456”. Write it clearly on the card — the official guidance is that it belongs on the card, and a corner away from the address is the common practice. When your card arrives, the recipient enters the ID on the Postcrossing website and the card is registered: your journey closes and the next one begins.
A missing or smudged ID is the one genuinely practical failure you can make, so double-check it before the card goes in the box.
Addressing and postage
Write the address on the right side of the back, in one clear block, with the country of destination easy to identify — many postal services recommend writing the country name in the destination language or in a widely understood form. Copy the address exactly as it was given: apartment numbers, company names, and village names included. Postcrossing addresses are formatted the way the destination postal service expects, so trust them.
Postage depends entirely on your postal service: international rates vary by country, destination, and weight, so the only safe advice is to check the current rate before mailing, especially the first time. Some services even charge differently for different destination regions, which is why a quick visit to your postal service's website settles it. Delivery times vary too — nobody can promise a timeline for international mail.
Postcards are normally sent without an envelope; the bare card is the point. Keeping to standard postcard sizes helps a card move smoothly through sorting, because postal systems are set up for them.
The message you don't need to fear
The blank space can feel like the hardest part, but it deserves its own guide — and it has one. What to write, who you are writing to, and how to make a card feel personal are covered in our guide to what to write on a postcard, with examples for friends, family, partners, and Postcrossing strangers. The short version: introduce the card, share one true detail about your place, and end with a question. The question is the gift — it invites a reply.
What happens after you drop it in the box
From the mailbox, the card travels through your country's postal system and then the destination country's, until a letter carrier walks it to a real door. The progress you can actually follow is human and old-fashioned: the recipient's registration on Postcrossing. When your account shows the card as received, you know exactly where those two minutes of attention ended up.
Registration also records the journey on your account, and if the recipient writes a note on the card's page — a thank-you, a favorite detail, a greeting — you will see it when you check. It is the closest a postcard journey gets to a reply.
When your card is old — and when it isn't
People often ask whether the cards in the atlas are old. They are not — they are new illustrations drawn in a vintage spirit, which suits Postcrossing well: they arrive crisp, and no one worries about a fragile antique. If you have a genuinely old card, or want to learn to tell real vintage from vintage-style at a glance, our guide to dating postcards walks through the backs, stamp boxes, and printing clues.
A small ritual worth keeping
None of this needs to be complicated. Pick a card from the place you actually know, write a true sentence and a question, add the ID, address, and stamp in their proper spots, and drop it in the box. The card carries a piece of your home across the world, and a piece of someone else's home comes back to you.
If you are looking for a place to start, browse the atlas — from the United States and Australia to the United Kingdom — and find the card that looks like where you live. The journal grows alongside it, with what to write and how to date for the rest of the story.