Find duplicate files in a folder — without uploading anything

Pick a folder and find files that are byte-for-byte identical — merged photo backups, redundant exports, whatever's eating your disk space. Everything is hashed and compared right here in this tab.

How it works: every file's contents are hashed with SHA-256; files sharing a hash are true duplicates, no matter what they're named. Nothing is uploaded — this page makes no network requests.

How to use this tool

Use the dropzone below — that's the whole tool. (The downloaded version is the same tool as a file that opens in any browser, no install or internet needed.)
In Chrome, Edge, or Brave, click Choose a folder… and pick the folder to scan (you'll get a one-time permission prompt). In Safari or Firefox, click Select a folder's files… instead.
Wait for the scan — a progress bar shows how many candidate files have been hashed.
Review the duplicate groups. One copy in each group is marked "Keep" by default; nothing is selected for removal until you choose.
In Chrome/Edge/Brave: check the duplicates you want gone, click Delete selected, and confirm. In Safari/Firefox: click Export list (.csv) and remove the files yourself.

No folder selected yet.

Pick a folder of photos, documents, or downloads to scan for exact duplicates.

What is this page?

This is the real Duplicate File Finder — the same tool Untracked sells as a download — running free, right here in your browser. Everything is processed entirely on your own device: nothing is uploaded, no account is needed, and the page makes no network requests after it loads. You can verify that yourself: load the page, open your browser's network inspector, or even disconnect from the internet and keep using it.

Questions people ask

Are my files uploaded anywhere?

No. The scan reads file contents inside your browser — the folder picker runs locally and no byte ever leaves your machine. Disconnect from the internet and it still works.

How does it detect duplicates?

By content, not filename: every file is hashed as it is read, and identical hashes are grouped as duplicates — so renamed copies are still found.

Is there a folder-size limit?

This free page is tuned for small folders (up to about 20 files per scan). The downloaded version scans folders of any size and adds one-click selection helpers.

What's the difference between this free page and the paid download?

The free page does unlimited scans on small folders. The €5 download removes the size cap, runs offline forever, and adds export of the duplicate report.