Six complete letters to a friend you can copy and fill in — write yours in the editor, seal it in an envelope, and share a private link.
We tell partners and parents how we feel. Friends mostly get jokes. That is fine, until you realise your closest friend may have no idea what they mean to you.
A friendship letter with no occasion attached is one of the most disarming things you can send, precisely because nothing prompted it.
A friendship letter template can only take you so far. It gets you past the blank page and gives the thing a shape — but the part that makes your friend sit down halfway through is the part only you can supply: the specific night, the specific favour, the joke that would take three paragraphs to explain to anybody else. Use the structure below and then replace every general line with one of those.
Writing to a brother or a sister rather than a friend? The tone is different enough to be worth its own page — our letter to a sibling templates cover the sister, brother and drifted-apart versions.
Six friendship letter examples, written for you to finish
Every example below is a complete letter for a friend. The sentences are written; the parts in [brackets] are the ones only you can fill in. Copy one, replace the brackets, send it.
Short letter to a friend
Use it when: You want to send something today and you are not going to write an essay. Under a hundred words and it still does the job. About 61 words.
Dear [their name],
This is not about anything. That is sort of the point - nothing prompted it, I just wanted it written down somewhere other than my head.
You are the person I would call first about [what]. I do not think I have ever said that out loud.
Everything in [brackets] is yours to replace. Cross out any line that is not true of the two of you.
Letter to your best friend
Use it when: The full one. For a birthday, a leaving do, or an ordinary week when it finally occurs to you that they do not know. About 181 words.
Dear [their name],
We went from acquaintances to actual friends on [the day or the moment], and I doubt you remember it the way I do. I remember [the specific detail - what was said, where you were, what was funny about it].
Since then you have shown up for me without being asked more times than is reasonable. The one I keep coming back to is [what happened]. You [what they actually did - the practical, unglamorous version]. I have told that story to other people. I have never told it to you.
The thing I envy about you, and I mean this generously, is [what]. I have watched you do it for years and I still do not know how.
If it is still sitting there: I am sorry about [the time you let them down]. I am not going to write four paragraphs about it. I just did not want it to go unsaid in a letter like this one.
In ten years I hope we are still [what you hope]. I think we will be.
Everything in [brackets] is yours to replace. Cross out any line that is not true of the two of you.
Letter to a friend you have drifted from
Use it when: Nothing went wrong. You just stopped being in the same rooms, and now it feels too late to text. About 131 words.
Dear [their name],
We did not fall out. Nothing happened. We just stopped being in the same rooms, and then I stopped knowing the small things, and now I find out about your life from [how you hear about them].
I am not writing to assign blame. Most of the distance is just adulthood and a decent share of it is mine.
I am writing because I keep thinking about [the specific memory - the summer, the flat, the drive, the running joke]. It came back to me [when], and it struck me that the person it belongs to has not heard from me in [how long].
That is it. No ask, no guilt. If you ever wanted to fix a date and actually keep it, I am there.
Everything in [brackets] is yours to replace. Cross out any line that is not true of the two of you.
Thank-you letter to a friend
Use it when: They did something for you and "thanks so much!!" in a message did not come close to covering it. About 110 words.
Dear [their name],
I said thank you at the time. It did not come close to covering it, so this is the version with the detail in.
You [exactly what they did], on [when], which cost you [what it actually cost them - the time, the drive, the day off, the awkward conversation they had on your behalf].
What it meant on my end was [what it changed for you]. You could not have known that part, which is why I am writing it down.
You did not make it a favour and you have not mentioned it since. I noticed that too.
Everything in [brackets] is yours to replace. Cross out any line that is not true of the two of you.
Letter to a friend you hurt
Use it when: You were in the wrong, they know it, and a message is not the right container for it. About 122 words.
Dear [their name],
I am not going to explain myself, because an explanation would just be an excuse wearing a better coat.
What I did was [name it plainly, in one sentence, without softening it].
What it did to you was [the impact, as best you understand it]. I have had [how long] to think about that and it does not look better with time.
I am not asking you to reply, and I am not asking you to be fine about it. If you want to tell me how it landed, I will listen to all of it without defending myself.
I am sorry. You deserved better from me and you have been a good friend for [how long].
Everything in [brackets] is yours to replace. Cross out any line that is not true of the two of you.
An example of a letter to a friend, line by line
This is one complete friendship letter, 140 words. Under each line is the reason it is written that way, so you can swap in your own details without losing the thing that makes it work.
Ren,
Why: Their name on its own line. No "Dear", no surname. This is the one letter where formality actively hurts you — an opening that sounds like a bank letter will make the next five lines read as a joke.
This is not about anything. I just wanted it written down somewhere that is not a group chat.
Why: The reason, in the first line, with no apology for not writing sooner. An apology up front asks your friend to do emotional admin before they have reached the point.
We met because you were the only person at that induction week who admitted they had not done the reading. Eleven years ago now, which I have checked twice because it does not seem right.
Why: How you became friends, told as an event rather than a summary. The detail that dates it — eleven years, checked twice — does more work than any adjective would.
In 2019 you got a train to a city you dislike and sat in a pub with me for four hours while I said almost nothing useful. You never once mentioned it afterwards, which is somehow the part I think about.
Why: One specific time they showed up. A general compliment can be deflected; a thing that happened cannot. The second sentence is the best line in the letter, and it is only there because it is true.
You are the person I would call first. I do not think I have ever said that out loud.
Why: The thing you actually mean, said plainly and exactly once. Decorating it is how sincerity turns into a greetings card.
In ten years I would like us to still be the people who can go three months without speaking and pick it up mid-sentence.
Why: One forward-looking line. Without it a letter that lists everything someone has done for you starts to read like a eulogy, which is the most common way this letter goes wrong.
Love, Sam
Why: "Love," is fine between friends, and so is your name on its own. Anything that sounds like the end of a work email will undo the six lines above it.
Notice how little of this is about friendship in general and how much of it is about one induction week, one train and one pub. That ratio is the whole technique — keep the shape, replace every detail. At 140 words it also sits under the 200-to-400 range suggested below, which is deliberate: it carries one memory. If you want the longer version, add a second memory in the same style rather than stretching the sentences you already have.
A letter to a friend is an informal letter, so there is no address block, no reference line and no "Dear Sir or Madam". It has five parts, and the only one people reliably get wrong is the second.
1
The greeting
"Dear [name]," works, and so does just their name on its own line. Skip surnames and skip "To whom it may concern" — this is the one letter where formality actively hurts you.
2
Why you are writing
One sentence, first line, no throat-clearing. "This is not about anything, I just wanted it written down" is a complete and excellent opening. What does not work is a paragraph apologising for not writing sooner — it makes the reader do emotional admin before they have got to the point.
3
The specific memory
One event, told in detail: where you were, what they did, what it cost them. This is the paragraph that does the work. A general compliment can be deflected; a thing that happened cannot.
4
The thing you actually mean
Say it plainly and only once. "You are the person I would call first" needs no decoration, and decorating it is how sincerity turns into a greetings card.
5
The sign-off
Match the register you have used all the way through. "Love," is fine between friends. So is your name on its own. Anything that sounds like the end of a work email will undo the four paragraphs above it.
Length: 200 to 400 words is the sweet spot. Long enough to hold two real memories, short enough that your friend does not feel they owe you an essay in return.
What to say in a friendship letter
1The moment you went from acquaintances to actual friends.
2A time they showed up for you without being asked.
3The thing you would call them about before anyone else.
4Something you envy about them, said generously.
5A time you let them down, if it is still sitting there — friendships survive being named.
6What you hope is still true about the two of you in ten years.
One thing to skip: Avoid undercutting every sincere line with a joke. One joke is charming; four is a defence mechanism they will notice.
The difference one specific line makes
Same sentiment, two ways of saying it in a friendship letter.
Most people write
“You are honestly the best friend anyone could ask for and I do not know what I would do without you.”
Write this instead
“In 2019 you got a train to a city you dislike to sit in a pub for four hours while I said nothing useful.”
Why it works: Friends deflect compliments; it is close to a reflex. A specific event is much harder to deflect, because it happened, and you both know exactly how it went.
Three ways to open a friendship letter
The first line is the hard part. Steal one of these and fill in the brackets.
“This is not about anything. I just wanted it written down somewhere.”
“I have told the [story] story to roughly nine people this year.”
“We met [how], which is a stupid way to meet the person I now call first.”
Ready-to-send friendship letter templates
Already written, with no blanks to fill in — pick one, edit the parts you want and send it.
Celebration of a Friend
“Not everyone is lucky enough to have a friend like you...”
Edit a template, pick a theme, add photos or a song.
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Share a private link
Password-protect it, or set the date it unlocks.
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They open an envelope
Sealed, with their name on it, opening into your friendship letter.
Questions people ask
What do you write in a letter to your best friend?
Start with how you became friends, name a specific time they showed up for you, and say plainly what they mean to you. The lack of an occasion is what makes it hit.
How long should a letter to a friend be?
200 to 400 words. Long enough for two real memories, short enough that they do not feel they owe you an essay in return.
What do I write to a friend I have drifted away from?
Name the drift in one sentence, do not apologise for it at length, then go straight into a memory. "We have not spoken properly in two years and I keep thinking about the summer we..." is the fastest route back into a friendship there is.
Is it weird to send a friend a letter?
Surprising, not weird. Nearly everyone reports that an unprompted letter from a friend is one of the nicest things they have received.
What is the correct format for a letter to a friend?
An informal one: a greeting on its own line, one sentence saying why you are writing, a specific memory told in detail, the thing you actually mean said plainly once, and a sign-off that matches the rest. No address block, no reference line, no "Dear Sir or Madam" — those belong in a formal letter and will make a letter to a friend read as a joke.
How do you start a letter to a friend?
With the reason, in one sentence, on the first line. "This is not about anything, I just wanted it written down somewhere" is a complete opening. Avoid starting with an apology for not writing sooner — it asks your friend to do emotional admin before they have reached the point.