Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteA Danish CPR number identifies you in civil and administrative records; it is not, by itself, a digital login, password or signature. It is used in dealings with Danish authorities and matters such as salary, banking, housing, insurance and doctor visits. For online logins and digital signatures, Denmark uses MitID.
What a CPR number is used for in Denmark
A CPR number is Denmark’s 10-digit civil registration number. People who live or have lived in Denmark are assigned one, and it is used to refer to the right person in contact with Danish authorities. Life in Denmark explains the CPR number’s administrative role.
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It is also important in practical situations such as receiving a salary, transferring money, finding housing, opening a Danish bank account, getting insurance and going to the doctor. These are common contexts in which the number may be needed—not a guarantee that having one alone makes you eligible for a service or satisfies a provider’s other requirements. Life in Denmark lists these arrival-related examples.
CPR number versus MitID
| Tool | What it does | What it does not establish on its own |
|---|---|---|
| CPR number | Identifies a person in Danish civil and administrative records. | It is not the digital credential used to log in or sign digitally. |
| MitID | Personal digital ID used to log in to Danish digital self-services and sign digitally. | It is distinct from the CPR number; knowing or providing the number is not the same as authenticating with MitID. |
Life in Denmark describes MitID’s login and digital-signature role. For example, Digital Post requires MitID to log in. A CPR number alone does not open your mailbox. See the Digital Post login guidance.
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Is a CPR number proof of identity?
Not on its own as a digital authentication credential. The number identifies the person or record involved, while MitID is used to authenticate for online services and digital signing. That distinction does not settle every identity-check rule used by every public or private service: requirements can depend on the particular transaction. Check the service’s stated requirements rather than assuming that giving a CPR number is sufficient proof of identity.
What to do when a private company asks for your CPR number
The Danish Data Protection Agency says private bodies may process CPR information when this follows from law or rules adopted under law, or when the person has given express consent. If a company asks for the number, you can ask why it needs it and whether the use has a relevant, objective purpose or is legally required. The Agency’s frequently asked questions explain the rules on private-sector processing.
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Whether a business may register or process a CPR number and whether it is entitled to demand or receive it from you are separate questions. The Agency notes that data-protection rules do not determine entitlement in every specific situation, nor do they decide what consequences follow if someone declines consent. The answer depends on the context and any other applicable rules, so this guidance is not a blanket claim that a request is always lawful, unlawful, optional or mandatory. See the Agency’s explanation of those limits.
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You can ask: “Why do you need my CPR number? Is registration required by law, or what is the relevant purpose? What happens if I do not provide it?”
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