The fill-opacity attribute is a presentation attribute defining the opacity of the paint server (color, gradient, pattern, etc.) applied to a shape.

Note: As a presentation attribute fill-opacity can be used as a CSS property.

You can use this attribute with the following SVG elements:


<svg viewBox="0 0 400 100" xmlns="">
  <!-- Default fill opacity: 1 -->
  <circle cx="50" cy="50" r="40" />

  <!-- Fill opacity as a number -->
  <circle cx="150" cy="50" r="40" fill-opacity="0.7" />

  <!-- Fill opacity as a percentage -->
  <circle cx="250" cy="50" r="40" fill-opacity="50%" />

  <!-- Fill opacity as a CSS property -->
  <circle cx="350" cy="50" r="40" style="fill-opacity: .25;" />

Usage notes

Value [0-1] | <percentage>
Default value 1
Animatable Yes

Note: SVG2 introduces percentage values for fill-opacity, however, it is not widely supported yet (See Browser compatibility below) as a consequence, it is best practices to set opacity with a value in the range [0-1].


Scalable Vector Graphics (SVG) 2
# FillOpacity

Browser compatibility

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