# transfqr

> File transfer between two devices over QR codes — no internet, no servers, no accounts.

transfqr streams a file as a fountain-coded sequence of QR codes from one screen, and reconstructs it on the other side using a camera. Because the codes are XOR-combined "repair symbols" generated by a Luby Transform encoder, the receiver only needs to capture any K + ε frames to rebuild the original — there is no acknowledgment channel and no need to retransmit on missed frames. This is the same idea behind broadcast satellite protocols, applied to two phones in the same room.

## Key facts

- Mobile app: iOS (App Store, name "Transfqr") and Android (Google Play, listed as "QR File Transfer" — same app, package com.transfqr.app). Web app at app.transfqr.com.
- CLI: `transfqr <file>` on macOS and Linux. Install with `curl -fsSL https://transfqr.com/install.sh | sh` or `npx transfqr <file>`.
- File-size cap: 50 MB hard, soft warning at 5 MB.
- Privacy: zero outbound network for transfers; analytics are opt-in and bucketed; crash reports are anonymous.

## Pages

- [Home](https://transfqr.com): What transfqr is, why fountain codes, comparison with AirDrop / Bluetooth / cloud sync, CLI install, privacy.
- [Privacy](https://transfqr.com/privacy): Full privacy policy.

## Optional

- [llms-full.txt](https://transfqr.com/llms-full.txt): full content of every page on this site for ingestion.