Is there a site where I can generate paper wallets for multiple cryptocurrency addresses?
I couldn't find a good one. So I made one:
Most paper wallet generators just generate bitcoin and derived coins. There wasn't one that generated non-btc ones like ethereum and monero. And the artwork is user changable too! Feedback welcomed.
I am still researching this topic, but appears that https://walletgenerator.net/ is a good place to start.
Then you should use a "dumb printer", preferably only connected via USB and one that does not have any kind of memory.
If you are investigating paper wallets, I also recommend that you read about the Glacier Protocol https://glacierprotocol.org/ which is definately Bitcoin-focused but does seem to cover very clearly the pitfalls and work-arounds associated with long-term storage and process protection required for archival quality paper-wallets.