Converting with the internet turned off
After your first visit to PrivaPDF, a Service Worker caches the entire application — the interface, the WebAssembly binary, everything needed to run a conversion — to your browser's local storage. On any later visit, even with WiFi off entirely, the page loads from that cache and converts exactly as it would online.
This is genuinely different from most "offline-capable" web apps, which usually just cache the UI shell and still need a network call to actually process anything — here the processing itself has no network dependency at all.