How to Make an Image
Transparent in Google Slides
Open your Google Slides presentation and select the image you want to make transparent.
Click on "Format options" in the top menu or right-click the image and select "Format options".
In the Format options panel, expand the "Adjustments" section.
Find the "Transparency" slider and move it to the right to increase transparency.
Adjust the slider until you reach the desired transparency level.
Close the Format options panel and review your slide.