Method 1: Finder triage (no install)
- Finder → File → New Smart Folder → set criteria (e.g. Kind is Movie, or Size > 100 MB).
- Sort by size: identical sizes next to each other are duplicate candidates.
- Quick Look (space bar) to confirm, then Trash the copies.
Good for hunting the big wins (videos, disk images, downloads folder chaos); tedious for thousands of small files.
Method 2: dupeGuru (free, open-source)
It scans folders by content hash, so a renamed copy is still a match. There is a fuzzy mode for near-identical names, and it marks all-but-one copy per group automatically. Review the list, then send to Trash. Commercial alternatives (Gemini 2 and similar) add polish but the free tool does the job.
Safety rules
Never scan system folders; keep one copy of anything you might reinstall; use Trash (not permanent delete) on the first pass; and for photos specifically, use the built-in Photos Duplicates feature instead, or start from the duplicate photos hub for the method that fits your device. Cleaning data files like CSVs? That's what our in-browser tools are for.
FAQ
Frequently asked questions
Does macOS have a built-in duplicate file finder?
Not a general one. Photos (Ventura+) has a Duplicates album for pictures, but for arbitrary files you need Finder tricks or a dedicated tool.
What's a good free option?
dupeGuru is free and open-source, scans by content (not just name), and supports fuzzy filename matching. It's the standard free recommendation.
Is it safe to auto-delete everything a tool finds?
Review before deleting: keep one copy of installers you still need, watch for files inside app bundles, and prefer sending to Trash over permanent deletion the first time.
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