Install this as a desktop app to get a Dock/Start-menu icon.
Scan a folder of PDFs
Pick a folder to begin. Everything runs locally in your browser — no files leave your machine.
Tip: in the folder picker, single-click the folder you want and click Upload (Chrome) or Open (Edge). You can also drag a folder onto this window.
Cache: empty.
No scans yet
Choose a folder of scanned PDFs and we'll find visually-identical duplicates.
Uses the same perceptual-hash algorithm as the macOS app: 64×64 grayscale → 2D DCT-II → top-left 16×16 → median bit-hash → averaged Hamming distance.