Observed arrival · 2026-09-28

Qrcadabra turns QR codes into an offline file-transfer channel

qrcadabra.com Visit website

Editorial interest 74/100 Selection signal · not a rating of the site

Qrcadabra presents a desktop-to-phone file transfer using sequences of QR codes scanned from a computer screen.

Landing page captured for the 2026-09-28 issue.

For: People transferring files where networks are unavailable
Worth noticing: The described transfer uses a 2×2 grid of dynamic QR codes and SHA-256 checks on the rebuilt file.

Field notes

The described workflow has the computer prepare a file and display a changing 2×2 QR grid for the phone camera to capture. The page says it uses compression and redundant shards to help recover transfers, then checks the rebuilt file with SHA-256. It lists macOS and Windows desktop apps; iPhone support is explicitly marked as coming soon.

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

◎NicheUnusually specific use

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