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Single file optical file transfer using a browser

336 starsHTML

ShadowCat – file transfer through QR Codes in a Browser

by unprovable·May 22, 2026·168 points·65 comments
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AI Analysis

●●●BangerWizardryNiche GemCozy

Streaming files over QR codes with missing-chunk recovery in a single offline HTML file.

Strengths
  • •Custom protocol handles chunking and CRC verification without any server infrastructure required.
  • •Missing-chunks grid allows resuming specific frames instead of restarting the entire transfer.
  • •Single-file offline design works on devices with dead radios but working cameras.
Weaknesses
  • •Transfer speeds are painfully slow compared to Bluetooth or Wi-Fi Direct alternatives.
  • •Requires HTTPS or localhost for camera access, complicating local network setup significantly.
Target Audience

Developers with old hardware, air-gapped systems, or privacy concerns.

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Snapdrop · PairDrop · Minet

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