As an EU citizen you may freely enter Denmark and remain in this country for up to 3 months without an EU residence document (registration certificate). If you are actively seeking employment, you may reside in Denmark for up to 6 months without a registration certificate. The periods of 3 and 6 months are calculated from the date of entry.
If you expect that your stay in Denmark will last more than 3 months (or 6 months for job-seekers), you have to apply for an EU residence document before the expiry of the three months.
For more information on the EU residence document please visit New to Denmark.
Additional practical information on moving to Denmark can be found here: