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How we send files over QR codes: a fountain code, a 30x faster encoder and a camera pipeline in Flutter

by Zincir X dev.to October 28, 2026

7 min read

Read on dev.to

Originally published on the Magical Share blog. The whole path, from file to file. Steps 1 to 3 run on the sending screen, 4 to 6 on the receiving phone. Magical Share sends files between nearby devices with nothing but light. One screen plays a stream of QR codes, and a phone camera reads them back into the file. There is no Wi-Fi, Bluetooth or internet anywhere in the path. The product walkthro…

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Topics Camera and media