DirMerge
DirMerge is a macOS utility for safely merging and syncing folders, with fast local copying and rollback protection for replaced files.
What is DirMerge?
DirMerge is a native macOS file utility that helps users merge and align the contents of two folders without changing the source folder. It is designed for people who manage photos, project folders, archives, and other local files across internal storage and external drives. The app lets you review differences between folders, copy new items into a target location, and handle name conflicts with a built-in undo workflow. On APFS volumes, it supports fast copy-on-write cloning for quick transfers that avoid duplicating storage blocks until files change. DirMerge also works with common external-drive formats by falling back to regular file transfer when needed. It is available for Mac and is intended for users who want a focused desktop tool for safer folder consolidation and sync-style merge tasks.
Key features
- Compare two folders and review new, identical, and conflicting files before merging.
- Merge files into a target folder while keeping the source folder unchanged.
- Undo replaced-file changes with a rollback workflow after a merge.
- Use fast APFS copy-on-write cloning on supported Mac volumes.
- Work with external drives and common storage formats such as APFS, HFS+, and exFAT.
- Swap source and target folders quickly when you need to reverse merge direction.
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Inspect caches, support files, containers, and login items before cleaning.
Safety overview
Status: Mostly safe
DirMerge is a file-management tool, so it needs access to the folders you choose in order to compare and copy files. That access is normal for its purpose. Its main practical risk is the same as with any merge utility: selecting the wrong target or accepting replacements you did not intend. Review the source and target folders carefully before starting, and keep your own backup of important data when working on irreplaceable files or external drives.
Recommendation: Keep DirMerge if you use it to combine or synchronize folders on your Mac. If you no longer need it, you can remove it like other apps, but expect to lose its merge history or app-specific settings and make sure any important folder work is finished first.
Common paths
/Applications/DirMerge.app
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