Localsend: An open-source cross-platform alternative to AirDrop

LocalSend is a free, open-source, cross-platform app that enables secure file and message sharing between nearby devices over a local network, eliminating the need for an internet connection or third-party servers. It uses a REST API with HTTPS encryption, generating TLS/SSL certificates on the fly for maximum security. This approach ensures fast, reliable local communication without relying on external infrastructure. The app supports Windows, macOS, Linux, Android, iOS, and Fire OS, with downloads available via app stores (e.g., Play Store, App Store, Flathub) or package managers (e.g., Winget, Homebrew, APT). Minimum requirements include Android 5.0, iOS 12.0, macOS 11 Big Sur, and Windows 10. For Linux, dependencies like xdg-desktop-portal are needed. Setup typically works out of the box, but firewall configuration may be required, allowing incoming TCP/UDP traffic on port 53317 and outgoing on any port. Additionally, disabling AP isolation on routers (especially guest networks) is recommended to avoid connectivity issues. The app also offers a portable mode (v1.13.0+) where settings are stored in a local file, and a hidden start option (v1.15.0+) using the --hidden flag.

LocalSend's development is community-driven, with contributions welcome for translation via Weblate or manual editing in the app/assets/i18n directory. The project is hosted on GitHub and Codeberg, with a detailed protocol documentation for secure communication. Unlike proprietary solutions like Apple's AirDrop, LocalSend provides a universal, open-source alternative that prioritizes privacy and decentralization. Its ability to work offline makes it ideal for environments with limited connectivity, such as remote areas or during network outages. The app's security model, which avoids centralized servers, reduces data breach risks. For tech professionals, LocalSend offers a practical tool for efficient local file sharing across diverse device ecosystems, enhancing productivity without compromising security. The project's active community ensures regular updates and support, with sponsors including browser testing services. Overall, LocalSend represents a robust, privacy-focused solution for local network communication.