opacity()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨September 2016⁩.

The opacity() <filter-function>.

Try it

filter: opacity(1);

filter: opacity(80%);

filter: opacity(50%);

filter: opacity(0.2);

filter: opacity(0);

<section id="default-example">
  <img
    class="transition-all"
    id="example-element"
    src="/shared-assets/images/examples/firefox-logo.svg"
    width="200" />
</section>

Note: This function is similar to the more established opacity property. The difference is that with filters, some browsers provide hardware acceleration for better performance.

Syntax

css

opacity(amount)

Parameters

amount Optional: The amount of the conversion, specified as a interpolation is 1. The default value is 1.

Formal syntax

<opacity()> = 
  opacity( <percentage> ? )

Examples

Examples of correct values for opacity()

css

opacity(0%)   /* Completely transparent */
opacity(50%)  /* 50% transparent */

opacity()     /* No effect */
opacity(1)

Specifications

Specification
Filter Effects Module Level 1 # funcdef-filter-opacity

Browser compatibility

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This page was last modified on ⁨Nov 6, 2025⁩ by MDN contributors.

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