If you are looking for a web-based wallet generator, there is another option worth considering – a deterministic one. Take a look at
https://iancoleman.io/bip39/. When using these tools, it is always a good idea to clone them and run them from your hard drive while staying completely offline for that extra layer of security.
Working offline with such scripts isn't enough precaution and security when that computer will go online again at some later point of time. It's difficult to assess a computer's security status and be sure there's no hidden malware. If you want security for your mnemonic recovery words or paperwallets, then you need to operate in a pristine and secure and disposable environment, like a live Linux box or agnostic Tails OS that don't permanently save any persistant data on the device.
You have to be certain that no data traces of your handling with mnemonic recovery words or exposed private keys are left on a device that might go online later.