If a player believes that the dealer will get a blackjack, they can buy insurance by giving the dealer an equal amount of their ante. If the player does buy insurance and the dealer does get a blackjack, then the player receives their insurance back. We read full information here ranked the best online blackjack casinos to help you get right to the top options. These legal US online blackjack sites and apps offer the best game variety, biggest blackjack bonuses, and highest levels of reputation and trustworthiness. Here are the top picks for online blackjack casinos, plus what makes each one among the best options for players. No, you cannot play blackjack online casino games for real money. Online gambling for real money is illegal in California, which includes all casino games like blackjack. You can, however, play blackjack online at sweepstakes sites like Chumba Casino that use virtual currencies.