What is the difference?

Both debt collection agencies and (court) bailiffs collect debts on behalf of a creditor. In doing so, debt collection agencies are not permitted to use any coercive measures, like the seizure and sale of goods. Debt collection agencies are only allowed to send letters with a request for payment. A (court) bailiff, however, has a legal status and is permitted to use coercive measures. For this, they usually require a court order.

Court bailiff or fake bailiff?

If you want to find out whether a bailiff is legitimate or not, please consult the public Bailiff Register (Dutch Royal Professional Organisation of Judicial Officers, KBvG) (Dutch).