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A complete, private, in-browser tool to find and remove duplicate files, photos, videos and documents — with verified content checksums, perceptual image matching, smart cleanup rules and runnable deletion plans.
Byte-for-byte matching with MD5, SHA-1, SHA-256, SHA-512 or CRC32 checksums — verified, not guessed.
Perceptual hashing finds the same image after resizing, cropping, re-compression or a format change (JPG vs WebP vs PNG).
Catch duplicate videos, audio tracks, PDFs and Office documents by content — across folders, archives and sources.
Same content, different name or location? Renamed and moved duplicates are detected by their fingerprint, not their path.
Groups v1 / v2 / final / final-final / copy / (1) style versions of the same document so you can keep just the latest.
Keep newest, oldest, largest, smallest, shortest path or a preferred folder — applied to every group in one click.
Removed copies go to a recoverable trash bin. Restore anything before you export. Your originals are never touched without you.
Organization, duplication and cleanup-opportunity scores show exactly how much space you can reclaim.
Files are scanned and hashed in your browser. Nothing is uploaded, stored or sent anywhere — GDPR-friendly by design.
A duplicate file finder is a tool that scans your files and folders, identifies copies of the same content, groups them together, and helps you delete the redundant ones to reclaim storage. Instead of comparing file names (which are unreliable), a good finder compares the actual contents of each file.
This tool does that entirely in your browser. It reads each file, computes a cryptographic checksum (a short fingerprint that is identical only when the bytes are identical), and groups files that share a fingerprint. For images it adds a perceptual hash so it can recognise the same picture even after it has been resized, cropped, re-compressed or saved in a different format.
Because everything runs locally, you get the accuracy of desktop deduplication software like dupeGuru, CCleaner or Duplicate Cleaner — with the convenience of a web page and none of the privacy risk of uploading your data.
Duplicate files accumulate silently — from repeated downloads, photo imports, backups, synced folders, copied project directories and shared drives. Over time they waste a surprising amount of space and make everything harder to find and back up.
Removing them is one of the fastest ways to reclaim storage and bring order to a messy drive, NAS or cloud account.
Not all duplicates are identical. Understanding the categories helps you decide what is safe to delete automatically and what deserves a manual review.
Comparing every file against every other file would be impossibly slow, so this tool uses the same shortcut professional deduplicators use: it first groups files by size, because two files can only be byte-identical if they have the same size. Only files that share a size are read and hashed.
Each candidate is then hashed with your chosen algorithm. Files with the same hash are byte-identical and are grouped as exact duplicates. If a group contains different file names it is flagged as renamed; if the same name appears in different folders it is flagged as moved.
In AI Smart mode, images are additionally fingerprinted with a perceptual (average) hash. Two images whose fingerprints are within a small Hamming distance are grouped as visually similar, even though their bytes — and therefore their checksums — differ completely.
Drag in a folder, pick a directory, drop loose files, or load a ZIP archive. Add several sources to scan across them at once. Nothing is uploaded — everything stays in your browser.
Quick (names), Standard (name + size), Deep (content checksums), or AI Smart (content + visually similar images + versioned files). Pick a hash if you want a specific algorithm.
The tool hashes only files that could match, then groups exact, renamed, similar and versioned duplicates and shows your storage and duplicate statistics live.
Open each group, preview files, and choose what to keep with one-click rules — keep newest, oldest, largest, smallest, a preferred folder, or pick manually.
Move redundant copies to the safe-delete trash (with undo), then export a duplicate report or a ready-to-run deletion plan as TXT, CSV, shell, PowerShell or batch.
| Method | Compares | Speed | Best for |
|---|---|---|---|
| Quick scan | File names only | Instant | A fast first pass to spot obvious name collisions |
| Standard scan | File name + size | Very fast | Likely duplicates without reading file contents |
| Deep scan | Full content checksum (MD5/SHA/CRC32) | Fast | Verified, byte-exact duplicate removal |
| AI Smart scan | Content + perceptual image hash + versions | Moderate | Similar photos, renamed copies and versioned docs |
| Archive scan | Files inside ZIP archives and on disk | Fast | Finding copies hidden inside archives |
| Enterprise scan | Content checksums over large data sets | Scales | Big folder trees, NAS exports and backups |
Reclaim space on a laptop or external drive by removing the copies that pile up in Downloads, Desktop and Documents.
Export a Google Drive, Dropbox or OneDrive folder and find the duplicates inflating your subscription before you pay for more space.
Deduplicate media libraries and shared folders on a NAS to free up volumes and speed up parity checks.
Confirm a backup is complete and find redundant copies across backup sets before archiving them long term.
Find resized, re-compressed and re-formatted copies of the same photo so your gallery keeps one high-quality version.
Spot re-encoded and resized copies of the same clip that are quietly doubling the size of your video folder.
Clean a music library of the same track stored in multiple formats and bitrates.
Detect copied modules, vendored libraries and cloned project folders in source trees and exports.
Audit shared drives for redundant data as part of storage governance and compliance cleanups.
Your files never leave your device. Scanning, hashing, image fingerprinting and cleanup planning all run in your browser.
Files are read with the browser File API and processed in memory. They are never sent to a server.
Hashing and grouping happen locally, so confidential documents and personal photos never leave the device.
Close the tab and everything is gone. There is no account, no history and no server-side storage.
Because no personal data is transmitted or stored, the tool sidesteps the compliance risk of upload-based scanners.
MD5, SHA-1, SHA-256 and SHA-512 via the browser Web Crypto API, plus a fast CRC32 — used for exact-match and integrity verification.
An 8x8 average hash reduces each image to a 64-bit fingerprint; small Hamming distances mean the pictures look the same.
Only files that share a byte size are ever read and hashed, so large selections stay fast and memory-light.
Files are read on demand from disk handles or ZIP entries, so the browser does not have to hold everything at once.
JSZip unpacks archives client-side so copies hidden inside ZIPs are compared alongside loose files.
Organization, duplication and cleanup scores turn raw counts into an at-a-glance picture of your drive.
Quick and Standard are great for a preview, but only content checksums prove two files are truly identical before you delete one.
Turn on AI Smart scan to catch resized and re-compressed photos that exact hashing alone will miss.
The "keep newest" rule is the safest one-click cleanup for most people — it preserves your latest edits.
Exact duplicates are safe to auto-remove; visually similar and versioned files are kept for review until you confirm.
Generate a shell, PowerShell or batch script to delete the chosen copies on your real drive — review it first, then run it.
Add multiple folders or ZIPs to find copies that span a working folder, a backup and an archive in one pass.
Automate deduplication at scale with a REST API: content hashing, similarity scoring, media fingerprinting, storage analysis, batch processing, async jobs, webhooks, API keys, team accounts and usage analytics.