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CSS | opacity() Function

  • Last Updated : 08 Aug, 2019

The opacity() function is an inbuilt function which is used to apply a filter to the image to set the transparency of the image.


opacity( amount )

Parameters: This function accepts single parameter amount which holds the amount of transparency. The value of opacity is set in terms of number and percentage. The value 0% represents the complete transparent image and 100% represents the original image.

Below example illustrates the opacity() function in CSS:


<!DOCTYPE html> 
    <title>CSS opacity() Function</title
        h1 {
        body {
        .opacity_effect {
            filter: opacity(30%);
    <h2>CSS opacity() function</h2>
    <img class="opacity_effect" src
        alt="GeeksforGeeks logo"


Supported Browsers: The browsers supported by opacity() function are listed below:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Safari
  • Opera
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