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The stdDeviation attribute defines the standard deviation for the blur operation. If two <number>s 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.

If the attribute is not specified, then the effect is as if a value of 0 were specified.

Usage context

Categories None
Value <number-optional-number>
Animatable Yes
Normative document SVG 1.1 (2nd Edition)


A pair of <number>s, where the second <number> is optional.

number-optional-number ::= number
                           | number, number

In the SVG DOM, a <number-optional-number> is represented using a pair of SVGAnimatedInteger or SVGAnimatedNumber objects.



The following elements can use the stdDeviation attribute


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