Deedy

QRFerry transfers a file between two devices entirely in-browser by streaming it as an animated sequence of QR codes, using RaptorQ fountain coding, Brotli/gzip compression, and WebAssembly-based QR rendering (fast_qr) and scanning (ZXing-C++) to survive dropped or blurred frames. It supports single and dual-lane 'Turbo' modes for higher throughput and verifies data integrity with layered CRC checks before saving, avoiding any server upload of the file.