Fix · GitHub and Git

fatal: refusing to merge unrelated histories

What you may see

My first pull fails after I created the repository with a README on GitHub

Most likely cause

The folder on your computer and the repository on GitHub started separately, so Git sees no common starting point.

Check first (about two minutes)

Open the repository on GitHub: does it hold only a README or licence made at creation?

The fix prompt

What you type here never leaves your browser. The search runs on this page, and nothing is sent to a server or to an AI.

The exact error or what you see

What you did before it happened

Kept only in this browser, on this device. Keys and passwords are removed before anything is saved.

Prompt language

You are a patient senior engineer who knows Git and GitHub very well and explains them to people who are not developers. I am not a developer, so explain every step in plain words and tell me exactly which button, menu or command you mean. If you are not sure about something, say so; do not guess.

THE PROBLEM
fatal: refusing to merge unrelated histories

THE EXACT ERROR OR WHAT I SEE
[paste the exact error here]

WHAT I DID BEFORE IT HAPPENED
[write in a few words what you did before it happened]

MOST LIKELY CAUSE
The folder on your computer and the repository on GitHub started separately, so Git sees no common starting point.

DO THESE STEPS, IN THIS ORDER
1. Run git log --oneline on my computer and show what is on GitHub (git fetch then git log origin/main --oneline).
2. If GitHub only has a README, merge deliberately: git pull origin main --allow-unrelated-histories, resolve conflicts with me, and then push.
3. If GitHub holds real work, stop and ask me before merging.
Stop and tell me if what you see does not match a step. Do not skip ahead.

CHECK THAT IT WORKED
- git log shows both histories joined and git push works.
Tell me exactly what I should see on the screen when it works.

DO NOT CHANGE
- Do not force push to replace what is on GitHub.
- Anything I did not ask about: the design, the text, other pages, other settings or the data.
- Do not delete files, data or branches, do not reset or force-push, and do not rewrite history, unless you first show me exactly what would be lost and I say yes.
- Do not paste, print or ask me to paste a password or secret key into this chat. If one is needed, tell me which settings page of the right service to store it in.

WHEN YOU FINISH
Explain in simple words what you changed (file by file or setting by setting), why you changed it, and how I can undo it.

Paste it into Claude, ChatGPT, Gemini or Cursor, then follow what it says.

After you tried it, did it work?

Steps

Run git log --oneline on my computer and show what is on GitHub (git fetch then git log origin/main --oneline).
If GitHub only has a README, merge deliberately: git pull origin main --allow-unrelated-histories, resolve conflicts with me, and then push.
If GitHub holds real work, stop and ask me before merging.

Do not do this

Do not delete the GitHub repository just to start clean if it holds anything.
Do not force push to replace what is on GitHub.

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