AIR-GAPPED FILE TRANSFER
Move a file
through the camera.
Your file stays on your devices. QRFerry compresses it, then sends raw binary through a loss-tolerant RaptorQ stream.
Local onlyBrotli-11 + gzip-9RaptorQ FEC
01
Choose a file
Compression and encoding stay in this browser.
or drop one here · up to 512 MB
02
Tune the channel
Robust modes use one target; dual modes alternate two stable lanes.
03
Play the QR stream
Fill the phone guide with this one complete code.
Waiting for a file
Camera never needs a network connectionCLOSER TO THE OPTICAL LIMIT
More useful bits.
Every exposure.
01
Compress first
Brotli quality 11 races gzip level 9; only the smallest result crosses the camera.
02
Raw binary QR
Byte-mode symbols remove Base45 expansion while stable finder geometry stays easy to track.
03
RaptorQ across time
Source and repair symbols are interleaved, so blur and dropped exposures become harmless erasures.