Duplicate Finder

How it decides two files are the same

Names and dates are not trusted. Files are compared by their contents, in three stages so large folders stay quick:

1. Files of different sizes cannot match, so only same-sized files go further.
2. The first 128 KB of each is fingerprinted with BLAKE3, a fast cryptographic hash. Most look-alikes are ruled out here.
3. Remaining candidates are hashed in full. Only files whose full hashes match are shown as duplicates.

This finds exact copies. It does not group photos that merely look alike, or a song saved at two different qualities.

One copy is always kept

Every copy you leave unticked is marked keep. Auto-select copies ticks all but one copy in each set, and Clean Rabbit will not let you tick the last one, whether you select by hand or automatically. Removed copies go to the Trash or Recycle Bin by default.

Good places to look

• Downloads, where the same installer or PDF often lands two or three times.
• Photo and video exports, especially after copying from a phone more than once.
• Old backup folders copied onto a newer drive.
• Shared project folders where files were duplicated "just in case".

How to use it

1. Open Clean Rabbit and choose Duplicate Finder.
2. Press Choose folder and pick where to look. Subfolders are included.
3. Press Auto-select copies, or tick the copies you want gone yourself. Unticked copies are marked keep.
4. Press Clean and confirm.