How these pages work
Every pair page loads its rate in your browser from Frankfurter, a free service that republishes the European Central Bank's daily reference rates. The page never stores a rate in its text: the number comes from the live request and is shown with its date. If the request fails, you see a clear message and a retry button instead of an old number, apart from a rate saved in your own browser within the last six hours, which is labelled as cached.
Reference rates are not bank rates
The ECB publishes its reference rates once on each working day, at around 16:00 Central European Time, for information only. They are mid-market figures with no fee and no margin, so they are a fair benchmark for judging a quote but not a price you can deal at. A bank, card issuer or transfer service will usually give you somewhat fewer units of the other currency, and the gap is the real cost of the service.
Which currencies are covered
The ECB reference list covers 29 currencies quoted against the euro, 30 counting the euro itself, among them the US dollar, euro, pound sterling, yen, Indian rupee, Philippine peso, Korean won, Brazilian real, Chinese yuan, Turkish lira, Canadian dollar, Mexican peso and Australian dollar. Currencies that the ECB does not publish a rate for, such as the Pakistani rupee, UAE dirham or Nigerian naira, cannot be converted here, so no pages exist for them.