Show HN: ShadowCat – file transfer through QR Codes in a Browser | Hacker News

ShadowCat, a browser-based single-page app, transfers files by splitting them into chunks and encoding them as QR codes for camera scans.

The receiving device reassembles the chunks and uses checksum verification to confirm data integrity.

Hacker News discussion highlighted potential uses for air-gapped messaging and offline transfers.

Commenters also compared QR transfers with IR and audio methods, while noting limits such as camera throughput and encoding constraints.