Use this simple tool to generate cryptographically secure passwords and keys. The default settings generate a rather secure randomized password.
Generated sequences are not sent or stored anywhere. Neither does Google, Meta or any other data hoarder see anything of what goes on here, unless your browser does something it shouldn't. Passwords are generated on the server, so there's nothing showing how sequences are generated.
If you need random keys for LoRa, check out Abiro LoRa Keys.