Look for a fast duplicate file finder for Windows 11/10

Czkawka  is a free, open-source cleaner duplicate file finder written in Rust that zeroes in on disk-wasting clutter—duplicates, empty folders, huge files, temporary files, and even similar photos, videos, or songs. It runs on Windows 11, macOS, Linux, and BSD, ships both a point-and-click GUI and a script-friendly CLI, and avoids spyware or telemetry of any kind. Multithreading, smart caching, and hash-based comparison make it noticeably faster than many legacy cleaners.

How to Use This Free Duplicate File Finders in Windows 11

1. Launch Czkawka GUI and choose Duplicates on the left-hand pane.

2. Add folders you want to scan—drag-and-drop or use the Add button. Exclude system areas you’d rather leave untouched.

3. Pick a matching method at the top:

• Hash (default, safest),
• Size & name (faster), or
• Approximate for fuzzy matches such as re-encoded photos.

4. Hit Search. Progress appears instantly thanks to multithreading; the first run also builds a cache so repeat scans are much quicker.

5. When results appear, use the Select menu (e.g., “Keep newest, mark the rest”) or tick boxes manually.

6. Click Delete, Move, Hard-link, or Symlink to act on the marked copies. A confirmation dialog and optional backup keep accidents at bay.

This is the best free duplicate finder software you can use in Windows 11 or Windows 10.