PairDrop
Open-source file transfer tool that enables instant sharing of images, videos, PDFs, and links between devices without setup or signup. Works across all platforms.
PairDrop is an open-source alternative to:

PairDrop is a simple, secure, and open-source solution for transferring files instantly between devices. No accounts, no complex setup, and no data storage—just direct peer-to-peer transfers.
Key Features
- Cross-platform support: Works on Windows, macOS, Linux, Android, iOS, and web browsers
- No setup required: Instantly share files without creating accounts or installing apps
- Peer-to-peer transfers: Files are sent directly between devices using WebRTC
- Multiple transfer methods: Pair devices permanently, use temporary public rooms, or scan QR codes
- Supports various file types: Share images, videos, PDFs, documents, and text messages
- Multi-language support: Available in 30+ languages
- Auto-accept files: Configure devices to automatically accept incoming files
- Open source: Fully transparent codebase available on GitHub
Tech / Self-Hosting
PairDrop is a client-side web application that uses WebRTC for direct peer-to-peer transfers. The official website acts as a signaling server only to establish connections, and no files are stored on servers. For self-hosting, the project provides complete instructions on GitHub for deploying your own instance.