numOctaves

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

See full compatibility

The numOctaves attribute defines the number of octaves for the noise function of the <feTurbulence> primitive.

An octave is a noise function defined by its frequency and amplitude. A turbulence is built by accumulating several octaves with increasing frequencies and decreasing amplitudes. The higher the number of octaves, the more natural the noise looks. Though more octaves also require more calculations, resulting in a negative impact on performance.

You can use this attribute with the following SVG elements:

<feTurbulence>

Example

Example 1

html,
body,
svg {
  height: 100%;
}

html

<svg viewBox="0 0 420 200" xmlns="http://www.w3.org/2000/svg">
  <filter id="noise1" x="0" y="0" width="100%" height="100%">
    <feTurbulence baseFrequency="0.025" numOctaves="1" />
  </filter>
  <filter id="noise2" x="0" y="0" width="100%" height="100%">
    <feTurbulence baseFrequency="0.025" numOctaves="3" />
  </filter>

  <rect x="0" y="0" width="200" height="200" filter="url(#noise1)" />
  <rect x="220" y="0" width="200" height="200" filter="url(#noise2)" />
</svg>

Example 2

html

<svg
  width="200"
  height="200"
  viewBox="0 0 220 220"
  xmlns="http://www.w3.org/2000/svg">
  <filter id="displacementFilter">
    <feTurbulence baseFrequency="0.05" numOctaves="3" result="turbulence" />
    <feDisplacementMap
      in2="turbulence"
      in="SourceGraphic"
      scale="50"
      xChannelSelector="R"
      yChannelSelector="G" />
  </filter>

  <circle cx="100" cy="100" r="100" filter="url(#displacementFilter)" />
</svg>

Usage notes

Value	`<integer>`
Default value	`1`
Animatable	Yes

<integer>: Defines the number of octaves. Negative values are forbidden.

Specifications

Specification
Filter Effects Module Level 1 # element-attrdef-feturbulence-numoctaves

Browser compatibility

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`numOctaves`	Chrome – Full support Chrome 5 (Release date: 2010-05-25) footnote Full support	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote Full support	Firefox – Full support Firefox 3 (Release date: 2008-06-17) footnote Full support	Opera – Full support Opera 15 (Release date: 2013-07-02) footnote Full support	Safari – Full support Safari 6 (Release date: 2012-07-25) footnote Full support	Chrome Android – Full support Chrome Android 18 (Release date: 2012-06-27) footnote Full support	Firefox for Android – Full support Firefox for Android 4 (Release date: 2011-03-29) footnote Full support	Opera Android – Full support Opera Android 14 (Release date: 2013-05-21) footnote Full support	Safari on iOS – Full support Safari on iOS 6 (Release date: 2012-09-10) footnote Full support	Samsung Internet – Full support Samsung Internet 1 (Release date: 2013-04-27) footnote Full support	WebView Android – Full support WebView Android 4.4 (Release date: 2013-12-09) footnote Full support	WebView on iOS – Full support WebView on iOS 6 (Release date: 2012-09-10) footnote Full support

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Full support: Full support