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How to Merge Branches in GitHub: A Complete Guide
Merging branches is one of the most fundamental workflows in GitHub — and one of the most misunderstood. Whether you're working solo on a side project or collaborating across a team, knowing how merging works (and what can go wrong) makes the difference between clean version control and a tangled commit history.
What Does Merging Branches Actually Mean?
In Git, a branch is an independent line of development. You might create a branch to build a new feature, fix a bug, or experiment with an idea — without touching the main codebase. Merging is the process of integrating the changes from one branch into another.
The branch you're merging into is typically called the base branch (often main or master). The branch carrying your new changes is the compare branch or feature branch.
When you merge, Git takes the commit history from both branches and combines them. If the changes don't overlap, this happens automatically. If they do overlap, Git flags a merge conflict that requires manual resolution.
Two Main Ways to Merge Branches in GitHub
1. Merging via a Pull Request (Recommended)
The pull request (PR) workflow is GitHub's native, collaborative approach to merging. It creates a formal review process before any changes reach the base branch.
Steps:
- Push your feature branch to GitHub
- Navigate to your repository and click "Compare & pull request" (GitHub often prompts this automatically)
- Set the base branch (where changes go) and the compare branch (your feature branch)
- Add a title and description
- Request reviewers if working in a team
- Once approved, click "Merge pull request"
GitHub offers three merge options inside a pull request:
| Merge Type | What It Does | Best For |
|---|---|---|
| Create a merge commit | Preserves full branch history with a merge commit | Teams wanting complete history |
| Squash and merge | Combines all commits into one before merging | Keeping the main branch clean |
| Rebase and merge | Replays commits on top of the base branch | Linear history preference |
Each option produces a different commit structure in your repository history — the right choice depends on your team's conventions and how much granularity you want in the log.
2. Merging via the Command Line
If you prefer working locally or need more control, Git's command line gives you direct access to the merge process.
Basic merge workflow: