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---
title: fill-opacity
slug: Web/SVG/Attribute/fill-opacity
page-type: svg-attribute
browser-compat: svg.global_attributes.fill-opacity
---
{{SVGRef}}
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:
- {{SVGElement('circle')}}
- {{SVGElement('ellipse')}}
- {{SVGElement('path')}}
- {{SVGElement('polygon')}}
- {{SVGElement('polyline')}}
- {{SVGElement('rect')}}
- {{SVGElement('text')}}
- {{SVGElement('textPath')}}
- {{SVGElement('tref')}}
- {{SVGElement('tspan')}}
## Example
```css hidden
html,
body,
svg {
height: 100%;
}
```
```html
<svg viewBox="0 0 400 100" xmlns="http://www.w3.org/2000/svg">
<!-- 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;" />
</svg>
```
{{EmbedLiveSample("Example", '100%', 150)}}
## Usage notes
<table class="properties">
<tbody>
<tr>
<th scope="row">Value</th>
<td>
<code>[0-1]</code> |
<strong
><a href="/en-US/docs/Web/SVG/Content_type#paint"
><percentage></a
></strong
>
</td>
</tr>
<tr>
<th scope="row">Default value</th>
<td><code>1</code></td>
</tr>
<tr>
<th scope="row">Animatable</th>
<td>Yes</td>
</tr>
</tbody>
</table>
> [!NOTE]
> SVG2 introduces percentage values for `fill-opacity`, however, it is not widely supported yet (_See [Browser compatibility](#browser_compatibility) below_) as a consequence, it is best practices to set opacity with a value in the range `[0-1]`.
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{SVGAttr("opacity")}}
- {{SVGAttr("stop-opacity")}}
- {{SVGAttr("stroke-opacity")}}