Wat betekent “kun je” in het Nederlands?

Kun je (or kan je in colloquial speech) uses kunnen with the second-person pronoun. In Dutch, kun is the older formal form and kan is the newer colloquial form; both are correct, and the choice marks register. Kun je is slightly more polite, common in writing and customer-service speech. Kan je is more casual, dominant in spoken Dutch.

The phrase asks about ability ("are you able to") and, more often, about willingness in a polite frame ("could you"). Dutch speakers use kun je dozens of times a day: kun je me even helpen (could you help me), kun je dit lezen (can you read this), kun je morgen (are you free tomorrow). The construction is the closest Dutch comes to a polite request that isn't mag ik.

For learners: kun je before a verb is asking the listener about their capability or willingness. It's slightly more direct than the conditional zou je kunnen (could you), but still polite. A Dutch shopkeeper saying kun je even pinnen (can you pay by card) is being neither impolite nor formal — just everyday Dutch.