Keys, addresses, QR-codes, everything is generated locally, nothing is sent over the Internet, your keys are safe, they never leave your device... just take care no one is watching your screen!
BOP let you create PaperWallet for Bitcoin BSV (but they work for BTC too) from many different templates (if you want to contribute with new template reach us on Twitter @boprun).
You can print, export PDF and also export keys and addresses in txt/json.