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].

Browser compatibility

BCD tables only load in the browser


Specification Status Comment
Scalable Vector Graphics (SVG) 2
The definition of 'fill-opacity' in that specification.
Candidate Recommendation Definition for shapes and texts
Scalable Vector Graphics (SVG) 1.1 (Second Edition)
The definition of 'fill-opacity' in that specification.
Recommendation Initial definition for shapes and texts