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index.md
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---
title: <feMorphology>
slug: Web/SVG/Element/feMorphology
page-type: svg-element
browser-compat: svg.elements.feMorphology
---
{{SVGRef}}
The **`<feMorphology>`** [SVG](/en-US/docs/Web/SVG) filter primitive is used to erode or dilate the input image. Its usefulness lies especially in fattening or thinning effects.
## Usage context
{{svginfo}}
## Attributes
- {{SVGAttr("in")}}
- {{SVGAttr("operator")}}
- {{SVGAttr("radius")}}
## DOM Interface
This element implements the {{domxref("SVGFEMorphologyElement")}} interface.
## Examples
### Filtering SVG content
#### SVG
```html
<svg xmlns="http://www.w3.org/2000/svg" width="300" height="180">
<filter id="erode">
<feMorphology operator="erode" radius="1" />
</filter>
<filter id="dilate">
<feMorphology operator="dilate" radius="2" />
</filter>
<text y="1em">Normal text</text>
<text id="thin" y="2em">Thinned text</text>
<text id="thick" y="3em">Fattened text</text>
</svg>
```
#### CSS
```css
text {
font-family: Arial, Helvetica, sans-serif;
font-size: 3em;
}
#thin {
filter: url(#erode);
}
#thick {
filter: url(#dilate);
}
```
{{EmbedLiveSample("Filtering_SVG_content", 340, 180)}}
### Filtering HTML content
#### SVG
```html
<svg xmlns="http://www.w3.org/2000/svg" width="0" height="0">
<filter id="erode">
<feMorphology operator="erode" radius="1" />
</filter>
<filter id="dilate">
<feMorphology operator="dilate" radius="2" />
</filter>
</svg>
<p>Normal text</p>
<p id="thin">Thinned text</p>
<p id="thick">Fattened text</p>
```
#### CSS
```css
p {
margin: 0;
font-family: Arial, Helvetica, sans-serif;
font-size: 3em;
}
#thin {
filter: url(#erode);
}
#thick {
filter: url(#dilate);
}
```
{{EmbedLiveSample("Filtering_HTML_content", 340, 180)}}
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- {{SVGElement("filter")}}
- {{SVGElement("animate")}}
- {{SVGElement("set")}}
- {{SVGElement("feBlend")}}
- {{SVGElement("feColorMatrix")}}
- {{SVGElement("feComponentTransfer")}}
- {{SVGElement("feComposite")}}
- {{SVGElement("feConvolveMatrix")}}
- {{SVGElement("feDiffuseLighting")}}
- {{SVGElement("feDisplacementMap")}}
- {{SVGElement("feFlood")}}
- {{SVGElement("feGaussianBlur")}}
- {{SVGElement("feImage")}}
- {{SVGElement("feMerge")}}
- {{SVGElement("feOffset")}}
- {{SVGElement("feSpecularLighting")}}
- {{SVGElement("feTile")}}
- {{SVGElement("feTurbulence")}}
- [SVG tutorial: Filter effects](/en-US/docs/Web/SVG/Tutorial/Filter_effects)