De or het formattering?

The correct Dutch article is:

de formattering

Rule Words ending in -ing: almost always de. See the rule

How to use formattering

the formatteringde formattering
this formatteringdeze formattering
that formatteringdie formattering
our formatteringonze formattering
your formatteringjouw formattering
every formatteringelke formattering
which formattering?welke formattering?
a big formattering / the big formatteringeen grote formattering, de grote formattering