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How to merge duplicates without deleting them.
Most duplicate finders make you choose which copy to delete, and something that expected the other copy breaks. Pangalin Space Manager merges instead: every copy stays where it is, with its name, and opens as before, but the copies share one set of storage on the disk.
How merging works
Your Mac's disk format, APFS, can let two files share the same storage until one of them is edited (Apple calls these clones). Pangalin Space Manager checks the copies are identical byte for byte, then turns the extra copies into clones of the first. If you later edit one copy, only that copy changes and takes its own space again.
Merging needs all copies to be on the same APFS disk, which your Mac's built-in disk is. Copies on different drives can't be merged and are skipped.
Find and merge duplicates
- Choose Go › Free Up Space (⌘2) and click Duplicates. To look in a particular folder or drive, use Go › Tools, open the Duplicates card, choose a place and click Scan.
- Each group shows how many identical copies there are, where they are and how much merging gets back. Files under 1 MB, caches, cloud placeholders and folders like
node_modulesand.gitaren't included. - Tick the groups you want, or use Merge all, then click Review and merge ….
- Click Merge. Each copy is checked again just before it's merged. Any copy that has changed, is on another volume or already shares storage is skipped and listed in the report.
Merged files look and behave exactly as before. Finder may still show each file at its full size, because sizes are counted per file; your free space goes up.
Would you rather delete a copy?
Open a group to compare the copies. Keep this — trash the other … moves the other copies to the Trash, recoverable until you empty it: Edit › Undo Move to Trash (⌥⌘Z) brings them back while Pangalin Space Manager is open, or drag them back out (Finder's Put Back isn't offered for files an app trashes). Choose this only if you're sure nothing uses the other locations.
Similar photos
The Similar list shows look-alike photos, such as bursts and retakes. They're different files, so they can't be merged: compare them, keep the best and move the rest to the Trash. Nothing is picked for you.
Doing it by hand
macOS has no built-in duplicate finder for files. In the Photos app, the Duplicates album (in the sidebar under Utilities) finds duplicate photos and lets you merge them inside your library. For other files, you can look for copies with Finder search, but check any copy is really unused before you delete it.
Related guides
Checked against Space Manager 3.45.1, 7 October 2026.