From scan to saved file

WiFiPeer pairs two devices with a QR code and then moves your files directly between them. Here is what happens at each step.

1. 01

   Open on your computer

   The site creates a short-lived, random session and turns it into a QR code. Nothing is uploaded — the code just contains a link back to this session.

2. 02

   Scan with your phone

   Your phone camera opens the link. Now both devices are in the same session and start looking for each other.

3. 03

   Devices connect directly

   A small signaling server passes a few connection details between the two devices — just enough for them to open a direct WebRTC channel. It never sees your files.

4. 04

   Files stream across

   Pick your files. They are split into small chunks and streamed straight to the other device, then reassembled and saved. Large files use flow control so the connection stays stable.

What is WebRTC?

WebRTC is a technology built into modern browsers for real-time, peer-to-peer communication. It is the same foundation used by video-calling apps. WiFiPeer uses its data channel to send files directly between two browsers over an encrypted connection, without routing them through a central server.

Do both devices need to be on the same Wi-Fi?

Not necessarily. When both devices are on the same network the transfer is fastest, but WebRTC can also connect across different networks. On very restrictive networks a relay server (TURN) may be needed as a fallback.