How to Find Duplicate Files on Mac (Free + Paid Methods)

Mac users accumulate duplicate photos, documents, and downloads without realizing it — sometimes 10s of GB of them. Here are four ways to find and remove duplicates, from the built-in Finder approach to dedicated tools.

Method 1: Use Finder's Smart Folder (free, ~20 min)

• File → New Smart Folder
• Add criteria: "Kind = Image" (or whatever you want to scan)
• Sort by size: View → Show View Options → Size
• Visually scan for pairs with matching sizes and names

Limitations: only catches same filename/size; misses renamed copies; no batch delete.

Method 2: Use Terminal with fdupes (free, ~30 min)

• Install Homebrew if you don't have it
• brew install fdupes
• fdupes -r ~/Pictures ~/Documents ~/Downloads
• Walk through the output, delete manually

Limitations: command-line only; tedious for non-technical users.

Method 3: Use dupeGuru (free, GUI)

• Download from dupeguru.voltaicideas.net
• Add folders to scan
• Click Scan, then walk through duplicates and mark for deletion

Limitations: UI feels dated; no duplicate preview; no recovery after deletion.

Method 4: FileForge ($9.99 launch / $14.99)

I built FileForge specifically because dupeGuru's UI frustrated me. FileForge does hash-based detection (catches renamed copies), has a 30-day Trash recovery window for anything you delete, and lets you:

• Set minimum file size to skip tiny files
• Keep newest / oldest automatically
• Preview every match side-by-side
• Exclude folders (Library, node_modules, etc. by default)

One-time $14.99 (currently $9.99 launch). No subscription. Try FileForge.

FAQ

Is it safe to delete duplicate files?

Yes, as long as you're sure they're true duplicates. FileForge hashes file contents — only identical files get grouped. Files go to macOS Trash first, recoverable for 30 days.

Why does my Mac have so many duplicates?

Common causes: Photos importing same images from phone+camera, saving documents in multiple locations, duplicate downloads, email attachments saved multiple times.

Does the built-in Photos app find duplicates?

macOS Ventura and later: yes, in Photos → Utilities → Duplicates. It only works inside the Photos library, not your whole Mac.

Are hash-based detection and name-based detection different?

Yes. Hash-based (what FileForge and dupeGuru use) checks the actual file contents — catches renamed copies. Name-based (what Finder uses) only catches files with identical names.

Conclusion

Most Mac users can recover 5–20 GB by finding and removing duplicates. Start with dupeGuru if you're technical, FileForge if you want something faster and prettier, or the Finder method if you just have 5 minutes and a specific folder to clean.

Related: What's Taking Up Space on My Mac?