Show HN: ShadowCat – file transfer through QR Codes in a Browser
Summary
ShadowCat is a fully offline, single-file HTML page that enables file transfer between two devices using QR codes via a browser. It supports Generate, Scan, Send file, and Receive file workflows, plus a simple QR-based protocol with header and data frames encoded in base64. Practical notes cover serving over HTTPS on a local network and tuning chunk sizes for older devices.