How can I create Ethereum wallet offline? I am doing it with bitadress.org for BTC but I don't know for Ethereum.
Being offline does not mean that you are safe. As long as there is an Internet connection *at any moment* you may be at risk.
- Download an open-source (Linux) system using the official URL.
- Download Electrum using the official URL.
- Boot your OS from an offline Pc and install Electrum wallet (that contain the private key).
- Create a watch-only wallet.
- use online PC to access to that wallet.
- Create a new transaction ----> click Preview ----> check everything is correct ----> click save.
- open your offline OS -----> open Electrum ----> Load Transaction ----> check it is correct -----> click Sign ----> enter your password.
- back to your online PC ---> Load Transaction ----> Broadcast it.
Try to make the open-source system safe and do not install any additional programs.