What Postcrossing actually is
Postcrossing is a website, not a company selling postcards. It launched in 2005, started by a Portuguese web developer named Paulo Magalhães who wanted a real postcard in his mailbox more often than travel alone could provide. As of this year, the project has logged more than 70 million postcards exchanged between members in over 200 countries.
The system solves a simple problem: you don't know anyone in Kazakhstan to mail a card to, and neither does anyone in Kazakhstan know you. Postcrossing hands out addresses at random from its pool of active members, so you always have somewhere to send a card, and your own address eventually gets handed to someone else.
I signed up on a Tuesday night in 2019 after seeing a stack of Postcrossing cards on a Reddit thread. My first card went to a reader in Minsk. Three weeks later, a card from Perth showed up in my mailbox, and I was hooked.
Setting up your account
Registration at postcrossing.com takes about five minutes. You'll need a working mailing address, since that's what gets shared with strangers who draw your name. Fill out your profile with a few sentences about what you collect or enjoy: it directly shapes what people write to you, and a blank profile tends to get a generic "hello from wherever" card in return.
I made the mistake of leaving my profile at one line for the first two months. My cards were fine, but forgettable. Once I added that I collect cards showing diners and roadside food stands, the cards I received got noticeably more specific, including one from a sender in Japan who found a diner-themed card just because my profile mentioned it.
Requesting your first address
Once registered, click "Send a postcard" from your dashboard. The system checks how many cards you currently have "in transit," since Postcrossing caps how many addresses you can hold at once early on, usually five for new members. Request one, and you'll get a name, address, and a unique tracking code starting with the sender's two-letter country code, like US-1234567.
Write that code on the card itself, ideally in the corner, since the recipient needs it to register the card as received on their end. Skip this step and your card technically never "counts," even if it arrives.
Writing a card a stranger will enjoy
Read the recipient's profile before writing anything. Most members list hobbies, favorite topics, or things they specifically want to receive, like cards with cats, mountains, or stamps from a certain era. I once sent a card mentioning I'd just eaten the best bowl of pho of my life, because the recipient's profile said she loved hearing about food from other countries. She wrote back later saying it was her favorite card that month.
If the profile gives you nothing to work with, ask a direct question instead of defaulting to "greetings from Ohio." Something like "what's the best meal you've had this year?" invites a response if they ever write back through a direct swap.
A card from a stranger who read your profile feels completely different from one that could have gone to anyone.
What happens after you mail it
After you drop the card in the mail, nothing happens on your end until the recipient logs it. Once they enter your tracking code on the site, the card is marked "received," which unlocks a new address for someone else to send you a card. That's the entire loop: one received card frees up one new outgoing address for another member.
The average time for a card to travel and get registered sits around 20 days according to Postcrossing's own published statistics, though I've had cards to nearby countries register in six days and cards to more remote regions take closer to two months.
When a card goes missing
Not every card arrives. Postal systems lose mail, and international mail loses more of it than domestic mail does. Postcrossing's system allows you to mark a card as "not received" after 60 days if the sender never gets confirmation, which frees up the sender to try again with someone else.
I've had four cards go missing out of roughly 130 sent since 2019, a loss rate close to 3 percent, which tracks with what other long-time members report in the Postmarked Stories community threads I read. It stings a little every time, especially if you spent real thought on the card, but it's a normal part of mailing things internationally, not a sign you did something wrong.
Postcard tags and direct swaps
The random address system is only part of what Postcrossing offers. Postcard tags let you browse cards other members are specifically offering, grouped by theme, like lighthouses, cats, or a particular country, and request one directly rather than waiting for the general lottery to hand you something unrelated to your interests. I've used tags to track down cards showing specific national parks for a collection a friend of mine is building.
Direct swaps work differently again. Once you've exchanged a few cards with someone through the standard system, or met them in a Postcrossing forum or meetup, you can agree to trade directly, bypassing the random address system entirely. This is how most of my ongoing pen-pal relationships started, including the one with a collector in Rotterdam I still write to regularly, covered in more depth in our Snail Mail section.
Postcrossing also runs periodic events, like postcard "meetups" in cities worldwide, where members bring cards to trade in person. I attended one in Rotterdam in 2019 with maybe 20 other collectors, and left with fourteen new cards and two people I still correspond with years later. If your city has an active Postcrossing community, it's worth checking the forums for an upcoming meetup before assuming the hobby is purely a mail-in exchange.
There's also a yearly event called Postcrossing Day, held around the site's founding date in July, where members are encouraged to send an extra batch of cards to celebrate. I usually treat it as a personal deadline to clear out a backlog of cards I've been meaning to send, and I've noticed the response rate on those cards tends to be faster than usual, since a lot of members are actively checking their mail around the same week.
If you're deciding between the random system, tags, and direct swaps as a new member, my honest advice is to stick with the random system for your first ten or so cards. It forces you to write to people whose interests you know nothing about ahead of time, which is a genuinely useful skill for the writing side of this hobby, covered in more detail in our guide on what to write on a postcard when you don't know what to say. Tags and swaps become more rewarding once you already have a feel for the exchange.
Common Questions
Is Postcrossing free to use?
Yes, registering and requesting addresses is free. You only pay for the postcards and postage you send, which for international mail from the US runs about 1.60 dollars per card as of mid-2026.
How long does it take to receive a postcard back?
It varies widely by country and postal speed. My cards to Germany have arrived in nine days. A card I sent to a small town in Brazil took 52 days. Expect anywhere from two weeks to two months.
Can I choose who receives my postcard?
No, for the standard exchange the system assigns you a random address anywhere in the world. Postcrossing also runs postcard tags and direct swaps if you want to trade with a specific person instead.
What if I don't have anything interesting to write?
Ask the recipient's profile a question. Most Postcrossing members list hobbies or things they collect on their profile page, and reacting to that beats a generic 'greetings from' line every time.
The Takeaway
How Postcrossing works comes down to one loop repeated over and over: request an address, mail a card, wait for it to register, and eventually receive one back from somewhere you've never been. The mechanics take five minutes to learn. The habit takes longer to build, but it sticks once a card from a stranger in another country actually lands in your mailbox. Register tonight and request your first address before you go to bed.