Five Tools to Find Duplicate and Similar Files
An objective review of the leading tools for system cleanup, comparing browser-based privacy (Sakarto), raw performance (Czkawka), audio analysis (dupeGuru), and platform-specific utilities.
📰 Blog
Tips, tutorials, and updates from the team behind Sakarto — the free browser-based duplicate file finder. Learn how to clean up duplicate images, videos, and audio files without installing anything.
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Why Sakarto Might Be the Most Versatile Duplicate Finder You've Never Installed
Sakarto brings 7 visual and 3 audio algorithms straight to your browser with zero uploads. We dive into the tech, the algorithms, and why it beats installing native tools for daily cleanup.
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Seven Ways to Catch a Duplicate: A Field Guide to Sakarto's Image and Video Algorithms
Sakarto offers 7 distinct visual algorithms for finding duplicate images and videos. We break down when to use Color Signature, pHash, ORB, and the rest—so you never waste time on the wrong tool again.
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Three Ways to Hear a Duplicate: A Field Guide to Sakarto's Audio Algorithms
Sakarto offers 3 distinct audio fingerprinting algorithms: Chromaprint, Essentia HPCP, and Meyda MFCC. We break down when to use each one—so you never waste time on the wrong tool again.
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Install Sakarto as a PWA: The Native App That's Not an App
Install Sakarto as a Progressive Web App on Windows, macOS, Linux, iOS, or Android. Works offline, opens like a native app, no app store required—completely free and private.
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The File Organizer You Never Knew Your Browser Had
Sakarto's file organizer lets you browse, delete, move, and rename files directly in your browser—no installation, no scanning, no fuss. We break down Media Viewer, Bulk Delete, Bulk Move, and Bulk Rename.
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Reverse Audio Search: Find Every Copy of One Track
Upload a reference audio file and Sakarto finds every similar copy in a folder. Chromaprint, Essentia HPCP, and Meyda MFCC explained—reference pinned, protected, and ready to compare.
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Reverse Image Search: Upload One Photo, Find Every Copy
Upload a reference image or video and Sakarto finds every similar copy in a folder. 7 algorithms explained—Color Signature, aHash, BlockHash, dHash, pHash, wHash, and ORB. Reference pinned, protected, and ready to compare.
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Reverse Search: Upload One File, Find Every Copy
Upload any image, video, or audio as a reference. Sakarto scans a folder and finds everything similar to it—crops, resizes, re-encodes, covers, and more. 7 visual + 3 audio algorithms. Reference pinned and protected.
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Color Signature: A Detailed Guide to Sakarto's Colour-Based Duplicate Finder
Sakarto's Color Signature algorithm finds duplicate photos and videos by comparing actual colour content across a 24×24 YUV grid. Free, browser-based, and 100% private. Learn how it works and when to use it.
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aHash: The Fastest Way to Find Duplicate Images and Videos
Sakarto's aHash (Average Hash) algorithm finds duplicate photos and videos in milliseconds by comparing brightness structure. Free, browser-based, and 100% private. Learn how to use it effectively.
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BlockHash: The Noise‑Tolerant Duplicate Finder for Messy Image Collections
Sakarto's BlockHash algorithm finds duplicate photos and videos by comparing block‑averaged brightness. Perfect for heavily compressed JPEGs, scanned documents, and noisy image collections. Free, browser‑based, and 100% private.
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dHash: The Gradient‑Based Duplicate Finder for Exposure‑Corrected Images
Sakarto's dHash (Difference Hash) algorithm finds duplicate photos and videos by comparing edge and gradient structure—not absolute brightness. Perfect for exposure‑adjusted, HDR, and color‑graded copies. Free, browser‑based, and 100% private.
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pHash: The Frequency‑Domain Duplicate Finder for Edited Image Collections
Sakarto's pHash (Perceptual Hash) algorithm finds duplicate photos and videos using the same Discrete Cosine Transform as JPEG compression. Perfect for re‑compressed, watermarked, and lightly edited copies. Free, browser‑based, and 100% private.
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wHash: The Fast Wavelet-Based Duplicate Finder for Large Image Collections
Sakarto's wHash (Wavelet Hash) algorithm finds duplicate photos and videos using a Haar Wavelet Transform—faster than pHash with near-identical accuracy. Perfect for large collections where speed matters. Free, browser-based, and 100% private.
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ORB: The Only Algorithm That Finds Rotated, Cropped, and Perspective‑Warped Copies
Sakarto's ORB feature matching algorithm finds duplicate images and videos using OpenCV.js keypoint detection—the only algorithm that handles rotation, cropping, and perspective distortion. Free, browser‑based, and 100% private.
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Reverse Image Search by Colour: Find Every Copy of Your Reference File
Upload a reference image or video and Sakarto finds all similar copies using Color Signature matching — the only colour-aware algorithm. Perfect for tracking down copies of a specific photo across your archives. Free, browser-based, and 100% private.
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Reverse Image Search with aHash: The Fastest Way to Find Copies of a Reference File
Upload a reference image or video and Sakarto finds all similar copies using aHash (Average Hash) — the fastest algorithm for large folders. Perfect for finding resized, re-compressed, and format-converted copies of a specific file. Free, browser-based, and 100% private.
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Reverse Image Search with BlockHash: The Noise-Tolerant Way to Find Copies of a Reference File
Upload a reference image or video and Sakarto finds all similar copies using BlockHash — the noise-tolerant block-averaging algorithm. Perfect for finding heavily compressed, re-encoded, or noisy copies of a specific file. Free, browser-based, and 100% private.
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Reverse Image Search with dHash: The Gradient‑Based Way to Find Exposure‑Adjusted Copies
Upload a reference image or video and Sakarto finds all similar copies using dHash (Difference Hash) — the gradient‑based algorithm that ignores brightness and exposure changes. Perfect for finding colour‑graded, brightness‑corrected, and exposure‑adjusted versions of a specific file. Free, browser‑based, and 100% private.
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Reverse Image Search with pHash: The All‑Round Choice for Finding Edited Copies
Upload a reference image or video and Sakarto finds all similar copies using pHash (Perceptual Hash) — the DCT‑based algorithm that detects re‑compressed, resized, watermarked, and lightly edited copies. Free, browser‑based, and 100% private.
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Reverse Image Search with wHash: The Speed‑to‑Quality Sweet Spot for Reference Searching
Upload a reference image or video and Sakarto finds all similar copies using wHash (Wavelet Hash) — a multi-level Haar wavelet transform that balances speed and accuracy. Perfect for finding re-compressed, resized, and lightly edited copies of a specific file. Free, browser-based, and 100% private.
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Reverse Image Search with ORB: The Only Way to Find Rotated, Cropped, and Perspective‑Warped Copies
Upload a reference image or video and Sakarto finds all similar copies using ORB feature matching—the only algorithm that handles rotation, cropping, and perspective distortion. Perfect for finding geometrically transformed copies of a specific file. Free, browser-based, and 100% private.
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Chromaprint: Spectral Fingerprinting for Duplicate Audio Detection
Sakarto's Chromaprint-inspired algorithm finds duplicate and similar audio files using spectral fingerprinting—perfect for re-encoded tracks, different bitrates, and near-identical audio. Free, browser‑based, and 100% private.
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Essentia HPCP: Harmonic Fingerprinting for Covers, Live Recordings, and Musical Similarity
Sakarto's Essentia HPCP algorithm finds duplicate and similar audio files by harmonic content—catching cover versions, live recordings, and alternate arrangements that spectral methods miss. Free, browser‑based, and 100% private.
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Meyda MFCC: Timbral Texture Detection for Speech, Podcasts, and Sound Effects
Sakarto's Meyda MFCC algorithm finds duplicate and similar audio files by timbral texture—perfect for speech, podcasts, voice memos, and sound effects where pitch-based methods fail. Free, browser‑based, and 100% private.
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Reverse Audio Search with Chromaprint: Find Every Copy of Your Reference Track
Upload a reference audio file and Sakarto finds every similar copy in a folder using Chromaprint-inspired spectral fingerprinting. Pure browser JS, no uploads, reference pinned and protected.
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Reverse Audio Search with Essentia HPCP: Find Covers, Live Recordings, and Harmonic Matches
Upload a reference audio file and Sakarto finds every harmonically similar copy in a folder using Essentia.js HPCP—perfect for covers, live recordings, and alternate arrangements. Free, browser‑based, and 100% private.
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Reverse Audio Search with Meyda MFCC: Find Voice Memos, Podcasts, and Sound Effects by Timbral Texture
Upload a reference audio file and Sakarto finds every timbrally similar copy in a folder using Meyda.js MFCC fingerprinting—perfect for speech, podcasts, voice memos, and sound effects. Free, browser‑based, and 100% private.
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Media Viewer: The Browser-Based Gallery You Never Knew You Needed
Sakarto's Media Viewer lets you browse images and videos in any folder with masonry layouts, auto-scroll, play-all, and custom queues. Read-only, 100% local, and zero installation.
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Bulk Delete: The Safe Way to Remove Many Files at Once
Sakarto's Bulk Delete tool lets you select and permanently delete multiple files at once—images, videos, audio, documents, and archives. Queue Mode adds a safety net. Free, browser‑based, and 100% private.
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Bulk Move: The Safe Way to Reorganize Files in Your Browser
Sakarto's Bulk Move tool lets you select and move multiple files at once to a new subfolder—images, videos, audio, documents, and archives. Queue Mode adds a safety net. Free, browser‑based, and 100% private.
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Bulk Rename: The Pattern‑Based File Renamer You Didn't Know You Needed
Sakarto's Bulk Rename tool lets you rename multiple files at once with 14 powerful patterns—dates, timestamps, sequential numbering, custom names, and more. Preview before executing, with conflict detection. Free, browser‑based, and 100% private.