Whatever you do, don't use websites to create it
I made a mistake of making a vanity address using BitcoinVanityGen (The site even has HTTPS lol)
It was all fine for like a month then i deposited 6 bitcoin and within hours they accessed my wallet and stole all the bitcoins
That was sad experienced of yours, It is shows only that we need to be very careful in website that we are going to get
in. It is still much good and better to use legit bitcoin wallet address like electrum wallet.