Pen Pals for Adults: Where to Find One, How to Stay Safe, What to Write

The short answer: adults find pen pals through letter apps (Slowly, InterPals, Bottled), pen pal websites (Global Penfriends, PenPal World), Reddit's r/penpals, and paper-mail projects like Postcrossing. Pick by how you want to write: slow letters, quick chat, or actual paper. Keep personal details back until you trust someone, never send money, and lead your first letter with something specific rather than a list of hobbies.

Having a pen pal as an adult is more common than people assume. It suits the way friendship actually works once you are past school: irregular, from a distance, around everything else. You write when you can, they write back when they can, and nobody has to find a free Thursday.

Pen pal apps for adults

These are all real, active and free to start as of October 2026. Most have optional paid extras.

Slowly

The best-known pen pal app. You write letters rather than messages, and each one takes time to arrive depending on how far apart you are, from a few hours to a few days. You use a nickname and an avatar, not a photo, and get matched by interests and languages. On iPhone, Android and the web. It is the one to try first if you want long, thoughtful letters. Alternatives to it are compared here.

InterPals

Running since 1998. Profile-based, with photos, and searchable by country, age and language. Popular for language exchange and for finding someone in a specific place. Messages are instant, so it feels more like chat than letters.

Bottled

A message-in-a-bottle app. Your message drifts to a random person; if they keep it, you can start chatting, and if they release it, it floats on. Good if you like not choosing who you meet.

Spillr's Scrolls

Ours, so weigh this accordingly. Spillr is a free iPhone app (no Android, and you need an account). Scrolls are one letter a day to one stranger chosen at random somewhere in the world, with no handle, photo or profile attached. They can reply once within seven days, and if you both say yes, it opens into a chat. It is lighter than a pen-pal app: a way to see whether a connection is there before either of you commits to one.

Pen pal websites, including paper

• Global Penfriends. Has connected people by post and online for over 25 years. Members can write through its messaging system or swap letters, postcards and mail art by post. All ages are welcome, so check a profile's age before you write.
• PenPal World. A large, long-running pen pal site with an internal mailbox, a free tier and paid upgrades.
• r/penpals. A free Reddit community where you post a short introduction and people message you. Its current rules limit it to adults and ask you to put your age and gender at the start of the post. Both email and snail-mail pen pals are common.
• Postcrossing. Not a pen pal in the strict sense, but the easiest way into paper mail. You send a postcard to a random member; when it arrives, someone else sends one to you. Some people end up writing to each other properly after a few swaps.

Pen pal programs worth knowing about

If what you want is the act of writing more than a long-term friendship, letter-writing programmes are a lovely option. Letters Against Isolation and Love for Our Elders send volunteers' handwritten letters to older people, many in care homes. The World Needs More Love Letters gathers letters for people nominated by someone who loves them. These are usually one-way, which takes the pressure off. (Programmes that match you with people in prison, or that are designed for children, work quite differently and are not covered here.)

Safety tips for adult pen pals

Most pen pals are exactly who they say they are: people who like writing. The small number who are not tend to follow recognisable patterns, and a few habits protect you from nearly all of it.

1. Stay on the platform at first. Use the app or site's own messaging until you have exchanged enough letters to have a feel for someone. Anyone who pushes to move to WhatsApp or Telegram in the first message is a yellow flag.
2. Keep identifying details back. First name or nickname, city or country, a general sense of your job. Not your surname, street, workplace or daily routine.
3. For paper, think about your address. Postcrossing shares your address with the members who write to you, by design. If that bothers you, a PO box or a mailbox service solves it, and plenty of letter-writers use one.
4. Never send money, gift cards or crypto. Not for a visa, a ticket, a sick relative or an emergency. This is the single clearest sign of a scam, however long you have been writing.
5. Watch the pace. Declarations of deep connection in the second week, a story that keeps getting sadder, a reason they can never video call. Real friendships build slowly, which is the whole appeal of letters.
6. Be careful with photos. Share ones you would be fine with anyone seeing, and remember phone photos can carry location data.
7. If you meet, do it like a first date. Video call first. Somewhere public. Tell a friend where you will be.
8. Block and report freely. You do not owe anyone an explanation for ending a correspondence that feels off.

How to write a first pen pal letter

Profiles do the listing for you, so the letter does not need to. A good first letter is short and does three things: puts the reader somewhere, says one true thing, asks one answerable question.

“Hi Mara, I saw you're learning Portuguese and walking a lot, and I'm doing one of those badly and the other one well. I'm writing from a small flat in Leeds where it has rained for nine days. I took up letter-writing because my job is all emails and I wanted words that did not need a reply by end of day. Where's the best walk near you, and do you do it alone or with company?”

Things that help:

• Refer to something on their profile. It shows you read it and gives them an easy reason to reply.
• Write like you talk. Formal letters are hard to answer.
• One question, maybe two. Five questions turn a letter into a form.
• Leave the heavy stuff for later. You can get to the real things. Most good correspondences do, around letter four or five, once there is some trust.

If you want a handful of ready-made openings to adapt, what to write in a letter to a stranger has them.

Keeping it going (and letting it go)

Pen pal friendships live on rhythm more than intensity. A letter every week or two that you actually send beats a brilliant one you keep meaning to finish. If you are slow, say so: “Sorry this took a while, it has been a month” is a perfectly good first line.

And not every pen pal will last. Many correspondences run for three or four letters and fade, and that is normal. If you want to end one, a short, kind goodbye is better than vanishing: “I've loved these letters, but I don't have the time to keep up at the moment. Thank you for writing to me.”

The ones that do last can become some of the steadiest friendships in your life, partly because they never had to compete with your calendar. If you are also looking for friends nearer home, how to make friends as an adult is the companion piece to this one.