Currency
Danish kroner (DKK), not euros. Denmark is in the EU but voted in a referendum to stay out of the eurozone; the krone is pegged to the euro but you cannot spend euros normally. A few tourist-facing places will accept euro notes at a deliberately poor rate — don't. Prices are written with kr. after the number.
Cards and cash
Copenhagen is one of the most cashless cities anywhere. Contactless Visa and Mastercard, Apple Pay and Google Pay work in shops, museums, ticket machines and on transit, and plenty of places take no cash at all. MobilePay is what locals use and you cannot get it — it needs a Danish CPR number and a Danish bank account. Crucially, when a terminal or ATM offers to bill you in Canadian dollars instead of kroner, decline and choose kroner: that is dynamic currency conversion and the merchant's rate is meaningfully worse than what your own bank would give you.
Tipping
Service is included and hospitality staff are on proper wages. There is no fifteen-to-twenty-percent expectation and no guilt-trip tip screen culture. Rounding up the bill or leaving a little for genuinely good table service is generous; at counters, cafés and bars, nothing is expected.
Plugs and voltage
230 volts, 50 Hz. The Danish standard socket is Type K — two round pins plus a grounding pin sticking up from the socket below them. A two-pin Europlug (Type C) fits a Type K socket safely, so a cheap Type C adapter handles phones, laptops and camera chargers. French-style (Type E) and Schuko-style sockets are now also permitted in Denmark, so newer hotels are a mixed bag; a combined C/E/K adapter covers everything. Warning worth heeding: an earthed Schuko (Type F) plug will physically push into a Type K socket but will not make an earth connection, which is a genuine shock hazard, not a technicality. And an adapter only changes the shape — a Canadian 120-volt-only appliance such as a curling iron needs an actual voltage converter, while anything marked 100–240V is fine on an adapter alone.
Tap water
Safe, closely monitored, and genuinely good. Denmark's public supply comes entirely from groundwater, in Copenhagen's case filtered through chalk and sand and clean enough that it is not routinely chlorinated. Drink it from any tap and refill at the public drinking-water posts around the city. Buying bottled water here is money thrown away.
Language and safety
Danish, with English spoken to a near-native standard by almost everyone under seventy — you will never be stuck. The city is very safe, and the two things that actually catch visitors are these. First, pickpockets working in pairs around Central Station, Nørreport, Strøget and Nyhavn, most active in summer; professional, well-dressed ones also work hotel lobbies and restaurant tables. Second, street sellers offering canal-tour or Tivoli tickets — buy at the official desk or app, not from a person with a clipboard. In Christiania, residents and police together shut down the open cannabis market in 2024 and Pusher Street itself was physically dug up, but dealing there was always illegal and remains so; don't buy, and don't photograph anyone who is.