I'd suggest install a separate browser (there exists a myriad by now), unplug internet, use the service, uninstall the separate browser, reboot pc.

I suggest a separate VM for that, that you can delete when you're done. Add put the VM on a separate PC that you bought with cash off craigslist. Then toss the PC away in a different postcode when you're done. Then you can use the PDF tool safely without fear you're being tracked.