The house edge in blackjack typically ranges from 0.5% to 2%, depending on the rules, number of decks, and whether the player uses basic strategy. Single-deck games with favorable rules (e.g., dealer stands on soft 17, late surrender, 3:2 payout for blackjack) can push the edge below 0.5%. Multi-deck shoes with restrictive rules (e.g., 6:5 payouts, dealer hits soft 17) often inflate it beyond 1.5%.

Yes. Fewer decks generally improve player odds. A single-deck game offers better probabilities for drawing blackjacks and favorable cards after key cards are removed. As deck count increases (4, 6, or 8 decks), the effect of card removal diminishes, slightly worsening odds for players—especially when combined with unfavorable rule sets.

Basic strategy minimizes the house edge but doesn’t eliminate it. You’ll still lose money over the long term, though at a much slower rate than with random play. True advantage requires card counting or other advanced techniques, which are not permitted in most online casinos and heavily monitored in land-based venues.

They can be—but often aren’t. Online casinos frequently use continuous shuffling (via RNGs), which negates card-counting benefits. However, some live dealer games mimic real-world conditions more closely. Always check the specific rules: payout ratios, soft 17 handling, and doubling/splitting options directly impact your odds.

Almost never. Insurance is a side bet with a high house edge (often over 7%). It only becomes marginally favorable if you’re counting cards and know the remaining deck is rich in tens—something impossible in standard online RNG blackjack. For average players, skip it every time.

Dramatically. A 6:5 blackjack payout instead of 3:2 alone increases the house edge by ~1.4%. If the dealer hits soft 17, that adds ~0.2%. No doubling after splits? Another ~0.15%. These seemingly minor changes compound quickly—always compare rule sheets before playing.