Git Merge vs Rebase — When to Use Which (2026 Guide)

Question: Should I use git merge or git rebase? And what’s the actual difference in practice?

The Core Difference

Both integrate changes from one branch into another. The difference is history:

• merge — Preserves complete history, creates a merge commit
• rebase — Rewrites history, creates linear commit history

# Before: feature branch has diverged from main
main:    A -- B -- C
                feature:         D -- E

# After merge:
main:    A -- B -- C -- M   (M = merge commit)
                \      /
feature:         D -- E

# After rebase:
main:    A -- B -- C -- D' -- E'
(D' and E' are new commits with same changes but different SHA)

When to Use git merge

1. Merging a completed feature into main/develop

git checkout main
git merge --no-ff feature/user-auth
# --no-ff creates a merge commit even if fast-forward is possible
# This preserves the context that "these commits were a feature branch"

2. Merging a public/shared branch

NEVER rebase a branch that others are working on. If someone has checked out feature/shared, rebasing it rewrites history and breaks their local clone.

3. When you want a complete audit trail

Merge commits with good messages preserve the intent: “Added OAuth2 authentication feature.” Some compliance environments require this.

When to Use git rebase

1. Keeping a feature branch up-to-date with main

# Your feature branch is behind main
git checkout feature/my-feature
git rebase main
# Replays your commits on top of latest main
# Cleaner than: git merge main (which creates a merge commit in your feature branch)

2. Cleaning up local commits before merging

# Interactive rebase to squash/reorder/edit commits before PR
git rebase -i HEAD~5  # Edit last 5 commits

# In the interactive editor:
pick abc123 Add user model
squash def456 Fix typo in user model  # squash into previous
squash ghi789 Actually fix typo       # squash into previous
pick jkl012 Add user controller
reword mno345 Add user views          # change commit message

3. Linear history preference

Some teams prefer clean linear history — every commit on main is meaningful, no merge commits. This requires rebase-based workflow:

# On feature branch, before opening PR:
git fetch origin
git rebase origin/main  # Bring feature branch current
# Fix any conflicts, then force-push
git push --force-with-lease origin feature/my-feature

The Golden Rule of Rebasing

Never rebase commits that exist outside your local repository.

If someone else has based work on your commits, rebasing rewrites the SHA hashes and breaks their history. Stick to rebasing commits that haven’t been pushed, or have only been pushed to your own feature branch (not shared with others).

Merge Conflicts: Same in Both

Both merge and rebase require you to resolve conflicts. With rebase, you might resolve the same conflict multiple times (once per commit that conflicts). With merge, you resolve it once.

# During rebase conflict:
git rebase main
# CONFLICT in src/auth.js
# Fix the conflict, then:
git add src/auth.js
git rebase --continue

# To abort the rebase:
git rebase --abort

Team Workflow Recommendations

Practical Setup: Configure Defaults

# Set pull to rebase by default (avoids accidental merge commits on pull)
git config --global pull.rebase true

# Set default branch name
git config --global init.defaultBranch main

# Useful aliases
git config --global alias.lg "log --oneline --graph --all"
git config --global alias.recent "log --oneline -10"

Quick Reference

# Update feature branch with latest main (clean):
git checkout feature/x && git rebase main

# Clean up commits before PR:
git rebase -i HEAD~N  # N = number of commits to edit

# Merge feature into main (preserving history):
git checkout main && git merge --no-ff feature/x

# Undo a rebase (within same session):
git rebase --abort  # during rebase
git reset --hard ORIG_HEAD  # after completed rebase (before pushing)