What is SwiftDrop?

SwiftDrop is a high-speed, privacy-first file transfer platform built for teams and power users. Transfers happen directly over your local area network (LAN) with no cloud relay by default — your files never leave your network unless you explicitly enable Relay Mode.

How it works

When two SwiftDrop devices are on the same Wi-Fi network, they discover each other automatically using UDP broadcast. The transfer happens over a direct TCP connection — fast, encrypted, and peer-to-peer.

When devices are on different networks (two offices, a remote worker connecting to the office), the Office Tunnel relay service bridges the gap. The relay only ever sees encrypted ciphertext — it cannot read your files.

Available platforms

• Android — smartphones and tablets (Google Play / APK)
• Desktop — Windows, macOS, Linux (Python/PyQt application)
• Web dashboard — manage your organisation, billing, and API keys at zashiron.org

Who is SwiftDrop for?

• Teams who need to move files between devices without cloud storage
• Power users who want fast, private LAN transfers
• Organisations with compliance requirements who cannot use consumer cloud services
• Developers who want a programmable file transfer API for their workflows

Key principles

SwiftDrop is built on three principles:

Speed — LAN transfers are limited only by your network hardware, not by artificial caps. Gigabit connections transfer files at near-line-rate speed.

Privacy — Your files are encrypted end-to-end using modern cryptography. Zashiron never sees the content of your transfers.

Simplicity — Open the app, see nearby devices, tap to send. No accounts required for basic LAN use.