Decimen Optical Transfer is a browser-based tool that transfers files between devices using only a screen and a camera — no network, no app install, no pairing required. It encodes files as an animated stream of QR codes using Luby transform (fountain coding), allowing the receiver to reconstruct the file from any sufficient subset of frames in any order. Supports files up to 64 MB, preserves filenames and media types, applies gzip compression when beneficial, and verifies integrity with SHA-256. Achieved 128 KB/s phone-to-phone in testing. Works offline after first visit and can be installed as a PWA on iOS and Android. Not encrypted — the data is visible to any camera. Open source under MIT, built with node-qrcode and zxing-wasm.
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