The official is a freemium application that can be downloaded for free from the official Sejda website . While the basic version is free, "Pro" refers to the paid tier that removes usage limits. Free Version vs. Pro Features

Sejda PDF Desktop (version 7.x) is compatible with major operating systems: Sejda PDF Desktop - Official Website

Sejda is highly rated for its intuitive interface and includes over 30 PDF tools:

Add password protection, watermarks, or digital signatures. System Compatibility