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SVG Blur Effects

<defs> and <filter>

All internet SVG filters are defined within a <defs> element. The <defs> element is short for definitions and contains definition of special elements (such as filters).

The <filter> element is used to define an SVG filter. The <filter> element has a required id attribute which identifies the filter. The graphic then points to the filter to use.

SVG <feGaussianBlur>

Example 1

The <feGaussianBlur> element is used to create blur effects:


Here is the SVG code:


<svg height="110" width="110">
    <filter id="f1" x="0" y="0">
      <feGaussianBlur in="SourceGraphic" stdDeviation="15" />
  <rect width="90" height="90" stroke="green" stroke-width="3"
  fill="yellow" filter="url(#f1)" />
Try it Yourself »

Code explanation:

  • The id attribute of the <filter> element defines a unique name for the filter
  • The blur effect is defined with the <feGaussianBlur> element
  • The in="SourceGraphic" part defines that the effect is created for the entire element
  • The stdDeviation attribute defines the amount of the blur
  • The filter attribute of the <rect> element links the element to the "f1" filter