Tool Open source
Decimen Optical Transfer is an open-source browser-based file-transfer tool by Evan Crawley that sends files between devices using only a screen and a camera, without a network connection, pairing, permissions beyond camera access, or a dedicated app. The sender displays an endless stream of animated QR codes; the receiver collects fountain-coded frames in any order and uses Luby transform decoding to reconstruct the payload, so dropped frames affect transfer time rather than correctness. Transfers preserve filenames and media types, accept pasted text, support files up to 64 MB, and verify completed payloads with SHA-256. The web app works offline after its first visit and can be installed on iOS and Android home screens. QR streams can also be exported as APNG or PNG sequences for playback from a file, page, or video. Transmissions are not encrypted: data is readable by any camera pointed at the sending screen. The project is licensed under AGPL-3.0-or-later as of v0.4.0; releases through v0.3.0 remain available under the MIT license.
2 uses taken from transcripts — each links to the moment in the video.
An open-source browser-based tool for transferring files between two devices using only a screen and a camera. It displays fountain-coded animated QR codes that another device captures and reconstructs without a network, pairing, or separate app.
Transfers files as light by displaying an endless sequence of QR frames in one browser and reconstructing them through another device's camera. It handles missed frames through fountain coding and verifies the completed payload by hash.
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