How does the duplicate finder detect copies?

It hashes the contents of each file and groups files with matching hashes, so it finds true byte-for-byte duplicates even when the filenames differ.

Are my files uploaded to be compared?

No. Hashing and comparison happen entirely in your browser, so your files never leave your computer.

Does it delete files automatically?

No. It only identifies duplicate groups; you decide which copies to keep or remove.

All tools/Disk Cleanup

Local Duplicate File Finder

Runs locally

Find duplicate files by comparing their actual contents, not just their names, right in your browser. Drop a folder of files and the tool groups byte-for-byte identical copies so you can reclaim space — all locally, with nothing uploaded.

How to find duplicate files

1Drop a folder or selection of files into the tool.
2Each file is hashed locally and identical contents are grouped together.
3Review the duplicate groups and decide which copies to remove.

Content-based, not name-based

Two files can have different names but identical contents — copies, downloads, exports. By hashing the bytes of each file, this finder catches those duplicates that a name-only search would miss, and it never flags files that merely share a name but differ inside.

Frequently asked questions

How does the duplicate finder detect copies?: It hashes the contents of each file and groups files with matching hashes, so it finds true byte-for-byte duplicates even when the filenames differ.
Are my files uploaded to be compared?: No. Hashing and comparison happen entirely in your browser, so your files never leave your computer.
Does it delete files automatically?: No. It only identifies duplicate groups; you decide which copies to keep or remove.