I just switched from QGIS 2.18 to version 3.0.3. In the earlier version, setting layer transparency was easily done with the "transparency" slider from the Layer properties->style tab. See image below:

QGIS 2.18 layer properties "style" tab

The newer QGIS version, however, does not appear to display such a transparency bar, as seen in next image. Is there a simple way to change a layer transparency in this verion of QGIS?

QGIS 3.0.3 layer properties "symbology" tab


You have to click on the layer rendering arrow (see the bottom of your second image) to access the slider and other option.

in QGIS 2 it was on by default, in QGIS 3 it's off by default...

  • Great! Talk about a simple solution! – LandryF May 31 '18 at 15:01
  • @LandryF Don't forget to accept the answer that helped you the most. – PolyGeo Jun 5 '18 at 19:38

As an alternative option, you can open Legend tab and select Opacity slider widget.

It will add an opacity slider in the Layers panel.

enter image description here

  • 1
    I assumed the opacity slider was only available for rasters until I read your answer. Thanks @Kazuhito! – csk May 31 '18 at 19:49
  • In case a future reader wonders how to find the Legend tab, it is accessed in the Layer Properties window (double-click a layer in the Table of Contents). Thanks @Kazuhito – Stu Smith Feb 27 '20 at 17:15

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