electrum – How can I convert my private key from bitaddress.org to WIF without putting the key into a website or a programme?

Rule number 1 says: don’t put your private key into any website or programme, unless you’re performing a transfer. This way you won’t be robbed.

Then, I want to “sweep” my money off a paper wallet from bitaddress.org, but Electrum wants me to put the private key in WIF format ( https://bitcoinelectrum.com/sweeping-your-private-keys-into-electrum/ ). How can I convert my key to WIF without breaking the rule number 1?

By the way, what’s the name of the format bitaddress.org returns private keys in? It is base58?