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Free Duplicate Folder Scanner: Try Before You Install

Scan a local folder in your browser for exact duplicates and image near-matches: no upload, no install, and a clear path to full cleanup.

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You should not need a desktop install to answer: "Does this folder have duplicates, and how much space could I recover?"

The Duplicate Folder Scanner Lite runs in your browser. Files stay on your machine. The scan reads them locally, groups exact matches, flags image near-matches, and totals recoverable bytes. Nothing uploads to a server.

What the browser scan gives you

Output Why it helps
Exact duplicate groups Same content, different names: the easy wins
Image similarity hints Burst shots and resized exports flagged for review
Recoverable space total Payoff visible before any risky action

Use it on a messy Downloads folder, a photo export dump, or a project directory before committing to a full cleanup session.

What it deliberately does not do

It does not move, delete, or rename files. It has no undo history, no NAS-scale scan orchestration, and no smart keeper rules across thousands of groups in one click.

When to upgrade to the desktop app

Move to Dupe Zappa's Duplicate Scanner when you need:

  1. Apply with undo: delete or move duplicates with Recycle Bin and operation history.
  2. Keeper rules: keep_highest_resolution, keep_oldest, keep_shortest_path, and more (guide).
  3. Network drives: scan \\nas\share trees with progress and exclusions (NAS guide).
  4. Perceptual tuning: review near-duplicate image groups with side-by-side previews.
  5. Cross-tool workflow: disk triage, junk cleanup, rename, and search in one app.

For the full Windows photo cleanup path (scan, review, keeper rules, safe delete), see the duplicate photos use-case page.

Suggested workflow

  1. Run the browser scanner on one folder. Note group count and recoverable GB.
  2. Open the largest groups mentally: are they safe exact copies or "review required" similar images?
  3. If the payoff justifies a real cleanup pass, open Dupe Zappa and re-scan with preview-first delete.
  4. Apply in batches. Re-run the browser scanner afterward to confirm group count dropped.

Privacy note

Browser-based does not mean cloud-based. The lite tool processes files locally in your session. For sensitive work folders, a browser scan lets you evaluate the workflow before installing desktop software.

Run the free scan first, preview every group, and apply only when you have undo.

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