Difference between git worktrees and git branches
Git worktrees and branches serve different purposes in Git workflows. Branches are logical pointers to specific commits, used to separate and organise tasks within a single working directory. Worktrees, on the other hand, are physical directories that allow you to work on multiple branches simultaneously, without switching or stashing changes.
Key points to remember:
- Branches: Lightweight, logical pointers that track commits. Ideal for isolating work within the same directory.
- Worktrees: Separate directories tied to a shared Git repository. Useful for multitasking across branches without disrupting ongoing work.
Quick Comparison:
| Feature | Git Branches | Git Worktrees |
|---|---|---|
| Purpose | Isolate tasks within one directory | Work on multiple branches in separate directories |
| Context switching | Requires git stash or WIP commits | Simply switch directories (cd) |
| Disk usage | Minimal | Higher due to duplicate working files |
| Environment isolation | Shared environment | Each worktree has its own environment |
| Setup | Simple commands (git branch, git switch) | Requires additional commands (git worktree add) |
| Use cases | Sequential tasks | Parallel tasks, code reviews, hotfixes |
Branches are simple and effective for straightforward tasks, while worktrees excel in multitasking scenarios. Use them together for greater efficiency in complex workflows.
Git Branches vs Git Worktrees: Side-by-Side Comparison
1. Git Worktrees
A Git worktree is a separate directory on your computer that allows you to work on a branch from an existing repository. Unlike cloning, it doesn’t duplicate the project’s entire history. Instead, it shares the central .git storage, references, and configuration. The only differences lie in the working directory and index, making worktrees much faster to create and far less demanding on disk space compared to multiple clones.
Purpose
The main idea behind worktrees is simple: they let you handle multiple branches at the same time, each in its own directory, without interference. For instance, if you’re in the middle of developing a feature and need to address an urgent hotfix, you can create a worktree for the hotfix and switch to it without stashing or losing your current changes.
“The friction appears when you need to context-switch mid-flow… Worktrees let you check out a branch into a completely separate directory on disk, while still sharing the same underlying .git folder.” – Jonathan Mitchell
However, Git has a key restriction: you cannot check out the same branch in more than one worktree simultaneously. This safeguard exists to avoid conflicting changes.
Storage and Resource Usage
Efficient use of disk space is critical in large-scale development. Worktrees achieve this by storing administrative data for each linked worktree in the main repository’s $GIT_DIR/worktrees folder. Instead of a full .git directory, the worktree itself contains a simple .git file that points back to the main repository. This setup ensures that shared elements like the object store, remotes, tags, and history remain centralised. Meanwhile, elements such as HEAD, the staging area, and specific references are unique to each worktree. The result? You get a separate working copy of the branch without duplicating the repository’s entire history.
Setup and Management
Managing worktrees is straightforward, thanks to a few key commands:
git worktree add <path> <branch>– Creates a new worktree at the specified path.git worktree list– Lists all active worktrees.git worktree remove <path>– Deletes a worktree and cleans up related metadata.git worktree prune– Removes stale references if a worktree directory was manually deleted.
For better organisation, it’s a good idea to create worktrees as sibling directories to your main repository (e.g., ../project-hotfix) rather than nesting them inside the repository folder. This approach keeps your workspace tidy and avoids unnecessary confusion.
Use Cases
Worktrees shine in scenarios that require multitasking. For example, urgent hotfixes can be handled in their own directory, so production bugs are resolved without disrupting ongoing feature work. Similarly, code reviews become easier – you can check out a colleague’s pull request in a separate worktree, test locally, and keep your primary workspace untouched.
They’re also particularly useful for teams working with AI coding agents. By setting up multiple worktrees – each serving as an isolated environment – you can run different agents simultaneously. For instance, one worktree could focus on building an authentication system, while another handles a payments API, all while sharing the same Git history.
“Worktrees are the clean solution. Each agent gets its own worktree – its own isolated working directory – but they all share the same Git object store.” – Jonathan Mitchell
2. Git Branches
Branches in Git provide a way to create logical separations within a single working directory, making it easier to manage and isolate code changes.
A Git branch is essentially a lightweight, movable pointer that tracks a specific commit in your repository’s history. Rather than duplicating files, it records a 40-character SHA-1 hash pointing to the latest commit. As the Stack Overflow Blog explains:
“A branch is simply a pointer to the latest commit in a given context.”
Purpose
Branches allow you to isolate work by creating a divergence from the main line of development (e.g., main). This means you can work on features or bug fixes without interfering with the stable codebase. Git uses a special pointer called HEAD to track your current branch, automatically advancing it to the latest commit you make.
“Branching means you diverge from the main line of development and continue to do work without messing with that main line.” – Git-SCM
Storage and Resource Usage
Branches are incredibly lightweight. Each branch corresponds to a small pointer file stored in .git/refs/heads/, taking up only 41 bytes. Because Git deduplicates unchanged files across commits, branches don’t require additional storage for identical content.
The only noticeable overhead comes during branch switching. When you use commands like git switch or git checkout, Git updates your working directory to match the target branch. For large projects, this can slow things down – not due to Git itself, but because tools like VS Code may need to re-index and re-parse files after the switch. This delay, often referred to as the “IDE tax”, highlights a key difference between branches and worktrees in terms of efficiency during multitasking.
Setup and Management
Creating and managing branches is straightforward:
- Use
git branch <name>to create a branch. - Use
git switch <name>to move to a branch. - Merge changes back into another branch with
git merge.
It’s a good practice to use clear and descriptive names for branches, such as feature/user-authentication or bugfix/login-error, to indicate their purpose.
A helpful tip: avoid committing directly to long-running branches like main or develop. Instead, use pull requests or controlled merges to integrate changes. This keeps the main branches clean and ensures the project history remains easy to follow.
Use Cases
Branches are versatile and can be used for both short-lived tasks and long-term development:
- Short-lived branches: Created for specific features or bug fixes, allowing developers to work independently.
- Long-running branches: These include
main,develop, orstaging, which serve as integration points throughout the project lifecycle.
This approach simplifies parallel development. For example, one developer can work on feature/payments-api while another handles bugfix/session-timeout. Neither task interferes with the other until both are ready to merge. This flexibility is what makes branches such a powerful tool in Git.
Pros and Cons
Git worktrees and Git branches offer different approaches to managing parallel work. Here’s a side-by-side look at their key differences:
| Feature | Git Branches | Git Worktrees |
|---|---|---|
| Context switching | Requires git stash or WIP commits, adding friction | Simply change directories (cd), making it seamless |
| Parallelism | Limited to one branch active at a time | Allows multiple branches to be active at once |
| Environment isolation | Limited; build artefacts and node_modules persist between switches | Strong; each directory has its own isolated environment |
| Disk usage | Minimal, as only one working copy exists | Higher, due to duplicated working files and dependencies, though Git history is shared |
| IDE impact | Frequent re-indexing and re-parsing during switches | Each worktree can have its own IDE window, avoiding the “branch-switching tax” |
| Tooling compatibility | Works universally with all IDEs and file watchers | May need manual setup; some language servers struggle with shared Git metadata |
| AI agent support | Limited to sequential execution | Supports concurrent execution of multiple AI coding agents |
| Complexity | Simple, following standard Git workflows | Slightly more complex, requiring management of multiple directories and paths |
How These Differences Play Out
Git branches are straightforward and work seamlessly across all tools, making them perfect for single-task workflows. They don’t require additional setup, and everything stays within a single working directory.
Git worktrees, on the other hand, shine when you need to work on multiple tasks at once, each in its own isolated environment. As Jonathan Mitchell, a Developer and AI Specialist, explains:
“The friction appears when you need to context-switch mid-flow… Worktrees are the clean solution.”
That said, worktrees do have drawbacks. Dependency managers like npm or pnpm create separate node_modules for each worktree, which can lead to increased disk usage, particularly in large projects. Another challenge is ensuring all your tools – terminals, IDEs, and development servers – are pointed to the correct directory, something branches handle more effortlessly.
As Kareem notes:
“The main downside is ergonomic: you have to remember to point your editors, dev servers, etc at the correct working directory. With branches alone, that’s a non-issue.”
Conclusion
Git branches and worktrees serve different but complementary purposes. Branches represent what you’re working on, while worktrees determine where that work happens. Together, they create a powerful combination for improving development workflows.
For straightforward, sequential tasks, branches alone often get the job done. They’re widely supported and require minimal effort to set up.
Worktrees, on the other hand, shine when you need to juggle multiple tasks – like handling urgent hotfixes, running extended tests, or conducting isolated code reviews – without disrupting your current work. In larger projects, using both tools together can minimise context switching, maintain your IDE setup, and keep work environments neatly separated.
FAQs
When should I use a worktree instead of stashing?
When juggling multiple branches, consider using a worktree instead of stashing your changes. A worktree lets you check out another branch in a separate directory, allowing you to work on both branches side-by-side without losing your current progress.
This approach eliminates the need for temporary commits or dealing with stash lists. It’s particularly useful for scenarios like reviewing pull requests or addressing urgent bugs, as it keeps your environments clean and avoids potential conflicts.
Can I have the same branch in two worktrees?
No, Git does not permit the same branch to be checked out in two worktrees at the same time. Each worktree requires a separate branch to avoid potential conflicts and ensure the repository remains consistent. If you try to check out the same branch in multiple worktrees, Git will stop you to maintain the integrity of your project and prevent any errors.
How do I safely delete a worktree?
To delete a worktree safely, the git worktree remove command is your go-to. Before you proceed, make sure you’re not currently working in the worktree you plan to delete. Switch to another branch or directory to avoid issues. Once ready, run the command:
git worktree remove <path-to-worktree> Replace <path-to-worktree> with the directory of the worktree you want to remove. This not only deletes the worktree but also cleans up its references in the repository, ensuring other worktrees or the main branch remain unaffected.
