How to write a letter
that actually lands.

Specific beats general, every time

"You mean everything to me" could be written about anyone. "You still do the voices when you read the cereal box out loud" could only be about one person. The second one is the whole trick — almost every other piece of advice here is a version of this.

One real memory outperforms a page of praise

Don't summarize the relationship. Pick a single specific scene — a place, a conversation, a small thing they did — and describe it in enough detail that they can picture it too.

Say the plain thing at least once

Letters that stay clever or careful the whole way through feel guarded. Somewhere in the middle, drop the performance for one sentence and just say the true thing directly.

Thank them for something specific, not in general

"Thank you for being there" is easy to forget. "Thank you for staying on the phone with me until 2am the night before my interview" is a sentence they'll reread.

Keep it shorter than you think it needs to be

The instinct under pressure is to add more, to make sure it's enough. Usually the opposite is true — a shorter letter you mean every word of beats a long one that starts to sound rehearsed by the end.

Match the tone to the relationship, not the occasion

A formal, careful tone can feel like a stranger wrote it if that's not how you two actually talk. Write in your real voice — jokes included, if that's genuinely you two.