De or het copywriting?

The correct Dutch article is:

de copywriting

Rule Words ending in -ing: almost always de. See the rule
Meaning (Dutch) het schrijven van tekst

How to use copywriting

the copywritingde copywriting
this copywritingdeze copywriting
that copywritingdie copywriting
our copywritingonze copywriting
your copywritingjouw copywriting
every copywritingelke copywriting
which copywriting?welke copywriting?
a big copywriting / the big copywritingeen grote copywriting, de grote copywriting

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).