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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 version of QGIS?

QGIS 3.0.3 layer properties "symbology" tab

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2 Answers 2

Reset to default
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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...

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  • Great! Talk about a simple solution!
    – LandryF
    Commented May 31, 2018 at 15:01
  • @LandryF Don't forget to accept the answer that helped you the most.
    – PolyGeo ♦
    Commented Jun 5, 2018 at 19:38
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As an alternative option, you can unfold the Legend tab and select Opacity slider widget. It will add an opacity slider in the Layers panel.

enter image description here

If you don't have an opacity widget yet you can enable it in the Layer Properties:

enter image description here

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  • 1
    I assumed the opacity slider was only available for rasters until I read your answer. Thanks @Kazuhito!
    – csk
    Commented May 31, 2018 at 19:49
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    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
    Commented Feb 27, 2020 at 17:15
  • For anyone else adding the slider and then not finding it: you need to use the little arrow on the left to drop it into view 😂
    – Squirrel in training
    Commented Apr 1, 2022 at 7:38

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