Web/CSS/filter-function/blur()

The blur() CSS function applies a Gaussian blur to the input image. Its result is a <filter-function>.

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Syntax

blur(radius)

Parameters

radius

The radius of the blur, specified as a <length>. It defines the value of the standard deviation to the Gaussian function, i.e., how many pixels on the screen blend into each other; thus, a larger value will create more blur. A value of 0 leaves the input unchanged. The lacuna value for interpolation is 0.

Examples

Setting a blur with pixels and with rem

blur(0)        /* No effect */
blur(8px)      /* Blur with 8px radius */
blur(1.17rem)  /* Blur with 1.17rem radius */

Specifications

Specification	Status
Filter Effects Module Level 1The definition of 'blur()' in that specification.	Working Draft

See also

• <filter-function>
• brightness()
• contrast()
• drop-shadow()
• grayscale()
• hue-rotate()
• invert()
• opacity()
• saturate()
• sepia()

blur() by Mozilla Contributors is licensed under CC-BY-SA 2.5.