8.17. MultiQML
MultiQML plugin for QGIS provides a fast way to apply one style to multiple vector or raster layers.
After installation the plugin will appear in the Plugins toolbar: .
In the plugin dialog:
select data type - raster or vector;
from the list on the left select layers to which you want to apply a common style;
upload QML file of the style.

Pic. 8.39. MultiQML dialog
You can save a new style for the layers and replace the existing styles directly from the plugin window. To do that, tick “Save as default”. A message will pop up: “Enabling this option will cause overwriting of any existing QML files. Are you sure?” Press Yes.
See the plugin at work in our video:
Watch on youtube.