1
Select your files
Pick one or more files in Qrcadabra Desktop and prepare the transfer.
Optical offline transfer
Move files
Move files
as if by magic.
Qrcadabra transfers files from your computer to your phone using dynamic QR codes. No Wi‑Fi, no Bluetooth, no cloud, and no cables.
Coming soon for iPhone · Desktop app for macOS and Windows.
Your files leave through QR codes. Your data never needs the cloud.
No InternetLocal transfer
No BluetoothScreen + camera only
No cloudFiles stay with you
SHA‑256Integrity check
How it works
Three steps. No connection between devices.
Qrcadabra turns your file into a visual sequence of QR codes, and the phone rebuilds the file as it scans them.
2
Scan the QR codes
The computer shows a 2×2 grid of dynamic QR codes while the phone captures the shards.
3
Receive and verify
The file is rebuilt on the phone and Qrcadabra checks its integrity with SHA‑256 before handing it over.
Features
Built to move files where a network is not an option.
A tool for isolated environments, technical teams, and anyone who wants a controlled transfer path.
Multiple dynamic QR codes
The app can show several QR codes at once to increase how much information the camera captures.
Verified integrity
Received files can be checked with SHA‑256 to confirm the rebuilt content matches the original.
Automatic compression
Large files can be prepared and compressed temporarily to reduce how much data must travel through QR codes.
Shard recovery
The protocol is built with redundancy and recovery, so you do not need every shard exactly once.
Desktop + Mobile
One screen sends. One camera receives.
The flow is intentionally simple: prepare the file on the computer and point the phone at the screen.
Qrcadabra Desktop
Select files, preview them, prepare the transfer, and show dynamic QR codes on macOS or Windows.
Qrcadabra Mobile
Scan multiple QR codes, rebuild the file, verify its integrity, and save it on your device.
Privacy by design
Your files do not need to leave the room.
The transfer happens visually between the screen and the camera. Qrcadabra is designed to work without a cloud service in the middle.
✓No required accounts to transfer.
✓No need to join both devices to the same network.
✓Integrity check of the received file.
✓Ideal for controlled flows and isolated environments.
Frequently asked questions
The essentials before you start.
Does Qrcadabra need the Internet?
Not for file transfer. The main flow uses the computer screen and the phone camera.
Do I need Wi‑Fi or Bluetooth?
No. Qrcadabra is meant to work without a direct wireless connection between the devices.
What if the phone misses a QR code?
The protocol can use redundancy and recovery so you do not have to wait for that exact missing shard.
Can I transfer large files?
Yes, though speed depends on QR size, frames per second, the camera, and how well the file compresses. Qrcadabra is built to keep improving this process.
A different way to move files.
2
Step 2
Download the app from Google Play or the App Store.