<feMorphology>

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The <feMorphology> SVG filter primitive is used to erode or dilate the input image. Its usefulness lies especially in fattening or thinning effects.

Usage context

CategoriesFilter primitive element
Permitted contentAny number of the following elements, in any order:
<animate>, <set>

Attributes

DOM Interface

This element implements the 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);
}

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);
}

Specifications

Specification
Filter Effects Module Level 1
# feMorphologyElement

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
feMorphology
in
operator
radius

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

See also