Gixo Lumen · deck how-to
How to Make a Shape Transparent in Google Slides
Transparency lives in the fill colour picker, under a custom colour's alpha slider — not in a separate transparency menu, which is why it is hard to find. The most common reason to want it is putting text over a photo, and that is a contrast problem before it is a design one.
Last reviewed: August 2026
Setting transparency
Why this is really a legibility question
- Aim for 4.5:1 contrast or better between text and whatever sits behind it, scrim included.
- Photos vary across the frame. Text can pass over a dark corner and fail over a bright one; check the worst area, not the average.
- A scrim beats fighting the image. Outlines and drop shadows on text are worse solutions to the same problem.
- Projectors wash out mid-tones. What reads at 30 percent transparency on a monitor often needs 50 percent in a room.
- If you need heavy transparency to make text readable, the image is probably wrong for that slide.
Free Gixo tools for this
Each of these runs in the browser and needs no account.
Frequently asked questions
How do I make a shape transparent in Google Slides?
Select the shape, open the fill colour picker, choose custom, and move the transparency slider. There is no separate transparency menu, which is why it is commonly missed.
How do I make text readable over an image?
Put a semi-transparent rectangle between the image and the text — a scrim — filled black at roughly 40 to 60 percent transparency, then check contrast rather than judging by eye.
Can I make an image transparent in Google Slides?
Image transparency is adjusted through the format options for the image rather than the fill picker used for shapes. For text legibility a scrim is usually the better tool.
What contrast ratio should slide text have?
At least 4.5:1 against whatever is behind it. Check the worst part of the background rather than the average, because photos vary across the frame.
Why does my slide look fine on my laptop and bad on the projector?
Projectors wash out mid-tones and lit rooms reduce effective contrast. Transparency that reads at 30 percent on a monitor often needs 50 percent or more in a real room.
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