The stdDeviation attribute defines the standard deviation for the blur operation.

Only one element is using this attribute: <feGaussianBlur>

<svg viewBox="0 0 480 200" xmlns="">
  <filter id="gaussianBlur1">
    <feGaussianBlur stdDeviation="1" />
  <filter id="gaussianBlur2">
    <feGaussianBlur stdDeviation="5" />
  <filter id="gaussianBlur3" x="-30%" y="-30%" width="160%" height="160%">
    <feGaussianBlur stdDeviation="10" />

  <circle cx="100" cy="100" r="50" style="filter: url(#gaussianBlur1);" />
  <circle cx="100" cy="100" r="50" style="filter: url(#gaussianBlur2); transform: translateX(140px);" />
  <circle cx="100" cy="100" r="50" style="filter: url(#gaussianBlur3); transform: translateX(280px);" />

Usage notes

Value <number-optional-number>
Default value 0
Animatable Yes
If two numbers are provided, the first number represents a standard deviation value along the x-axis. The second value represents a standard deviation along the y-axis. If one number is provided, then that value is used for both X and Y.

A negative value is forbidden. A value of zero disables the effect of the given filter primitive (i.e., the result is the filter input image). If stdDeviation is 0 in only one of X or Y, then the effect is that the blur is only applied in the direction that has a non-zero value.


Specification Status Comment
Filter Effects Module Level 1
The definition of 'stdDeviation' in that specification.
Working Draft No change
Scalable Vector Graphics (SVG) 1.1 (Second Edition)
The definition of 'stdDeviation' in that specification.
Recommendation Initial definition

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
stdDeviationChrome ? Edge Full support ≤18Firefox Full support 4IE ? Opera Full support 9Safari Full support 9.1WebView Android ? Chrome Android ? Firefox Android Full support YesOpera Android ? Safari iOS ? Samsung Internet Android ?


Full support  
Full support
Compatibility unknown  
Compatibility unknown