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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
