Rebase vs Merge in Git: Key Differences and When to Use Each

Use git merge to combine branches preserving the full history and showing all branch merges. Use git rebase to rewrite history by moving your changes on top of another branch, creating a cleaner, linear history.

Quick Comparison

Here is a quick side-by-side comparison of git rebase and git merge based on key factors.

Factor	git merge	git rebase
History Style	Preserves full branch history with merge commits	Creates a linear history by rewriting commits
Commit Graph	Shows all branch points and merges	No merge commits, history looks like a straight line
Conflict Resolution	Conflicts resolved once during merge	Conflicts may need resolving at each commit during rebase
Use Case	Good for preserving context of feature branches	Good for cleaning up commits before sharing
Safety	Safe for shared branches	Risky if rebasing shared/public branches
Command Complexity	Simple to use	Requires careful use to avoid rewriting shared history

Key Differences

git merge combines two branches by creating a new commit that ties their histories together. This keeps the full context of how branches diverged and merged, which is useful for understanding project history and collaboration. The commit graph will show all branch points and merges clearly.

git rebase moves your branch's commits on top of another branch, rewriting history to create a straight, linear sequence of commits. This makes the history cleaner and easier to read but changes commit hashes. Because it rewrites history, it should be used carefully, especially on branches shared with others.

While merge preserves the exact history and is safer for public branches, rebase is great for cleaning up your work before merging, making the project history simpler and more linear.

Code Comparison

Here is how you merge a feature branch into main using git merge:

bash

git checkout main
git merge feature-branch

Output

Updating abc1234..def5678
Fast-forward
 file.txt | 2 ++
 1 file changed, 2 insertions(+)

Rebase Equivalent

Here is how you rebase your feature branch onto main to create a linear history:

bash

git checkout feature-branch
git rebase main

Output

First, rewinding head to replay your work on top of it...
Applying: Add new feature

When to Use Which

Choose git merge when: you want to preserve the full history of how branches combined, especially in shared or public branches. It is safer and shows the true project timeline.

Choose git rebase when: you want a clean, linear history before merging your changes, typically on local or private branches. It helps simplify history but avoid rebasing branches others use.

Key Takeaways

Use git merge to combine branches safely without rewriting history.

Use git rebase to create a clean, linear commit history before sharing.

Avoid rebasing branches that others have already pulled to prevent conflicts.

Merge commits preserve the full context of branch integration.

Rebase can require resolving conflicts multiple times but results in simpler history.