Data Cleaner

A local web app that finds duplicate files on any drive or folder, lets you delete them, and organizes messy folders.

Run

Double-click start.bat, or:

node server.js

Then open http://localhost:4321. Requires Node.js 18+ and no other dependencies.

Hosted / browser mode

If the page is opened without server.js running (for example deployed as a static site on Vercel or GitHub Pages), it automatically switches to browser mode:

• Uses the browser's File System Access API, so it works in Chrome or Edge on a computer.
• You pick a folder with the browser's own dialog. Browsers don't allow picking whole system drives such as C:\, but subfolders are fine.
• Deleted duplicates are removed permanently, because browsers can't use the Recycle Bin.
• Organize and undo work the same way. The undo history lasts until the page is reloaded.

For full drive access and Recycle Bin support, run the app locally with start.bat.

Features

Duplicate Finder

• Pick any drive (C:, D:, USB…) or folder through the built-in folder browser.
• Compares files by size, then a quick partial hash, then a full SHA-256 hash, so only byte-identical files are reported.
• Filters: minimum file size, file type (images, videos, audio, documents, archives), hidden files.
• Auto-select rules: keep oldest, keep newest, or keep shortest path.
• Delete to the Recycle Bin (default) or permanently.
• Safety: the server only deletes files that came from a scan, and refuses to delete every copy of a file.
• System folders (Windows, Program Files, $Recycle.Bin, System Volume Information, node_modules, .git) are skipped.

Organize Folder

• Sort a folder's files into sub-folders by type, date (year/month), type + year, extension, or size.
• Optional: pull in files from sub-folders too.
• Preview every move before applying. Name clashes get (1), (2)… suffixes; nothing is overwritten.
• Undo the last organize (files go back, empty folders are removed).

The server listens on 127.0.0.1 only and rejects requests from other websites.