Find duplicate files in a folder
Drop a folder. Identical copies are grouped, the space they waste is counted, and a removal script is made.
- Runs on your device
- No sign-up
- Works offline after a visit
How to find duplicate files
- Drop the folder to search.
- Pick which copy to keep in each group, or keep the oldest, newest or shortest path.
- Copy the removal script, or export the groups as CSV.
Questions
How does it know two files are copies?
It compares sizes first, then SHA-256 fingerprints of the first 64 KB and of the whole file. Two files count as copies only when every byte matches. Empty files are left out.
What are look-alike photos?
Photos that look the same after being resized or saved again. Each photo is shrunk to 9 by 8 grey pixels and fingerprinted, and photos that differ by at most 6 of 64 bits are grouped. They are not byte-identical, so they do not count in the space you could free.
Does it delete the files itself?
No. A browser cannot delete files from your disk. The script lists the copies you did not keep: run it yourself, in the folder that holds them, after you have read it.
How is the copy to keep chosen?
The rule you pick (oldest, newest or shortest path) chooses one copy in each group. Change any group by hand with its own buttons.
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