ffsend is a command-line client for the Firefox Send service that makes sharing files and directories quick and secure. All files are encrypted on the client side before being uploaded, ensuring your data remains private throughout the transfer process.

Key capabilities include:

Encrypted file sharing: Upload files up to 1GB with automatic client-side encryption
Password protection: Add optional passwords to shared files for extra security
Customizable expiry: Set download limits (up to 20) and time-based expiry (up to 24 hours)
File management: View upload history, inspect remote files, change passwords, and delete shared content
Directory support: Archive and share entire directories as single files
URL utilities: Built-in share link shortener and QR code generator
Custom hosts: Use your own Send-compatible server instead of the default public instance
Low resource usage: Streaming encryption and transfer with minimal memory footprint
Script-friendly: Designed for automation and non-interactive use in scripts

The tool works across Linux, macOS, Windows, FreeBSD, and Android platforms. Simple commands like ffsend upload file.txt generate shareable links instantly, while advanced options allow fine-grained control over security parameters. Recipients can download files using the same tool or through a web browser, making it accessible regardless of technical expertise.