How to Add Custom Light and Dark Browser Theme Favicons in WordPress without Plugins

In this tutorial, we’ll dive into a simple yet powerful customization for your WordPress site โ€“ changing favicons based on a user’s preferred browser theme. As people love adding personal touches to their browsing experience by choosing light or dark themes, adjusting your site’s favicon accordingly becomes a clever way to match their style. This doesn’t just make your WordPress site look better; it also shows you care about giving users a smooth and personalized browsing journey.

Why Change Browser Theme Favicons?
Personalizing browser themes is a big part of the user experience. Tailoring your site’s favicon to match a user’s chosen theme is an easy and effective way to create a more visually pleasing experience. This tweak not only adds a bit of elegance to your WordPress site but also highlights your commitment to keeping up with the latest design trends.

Before proceeding with any customizations in WordPress, it’s essential to set up a child theme. A child theme acts as a safe and efficient way to make modifications without affecting the parent theme. If you haven’t set up a child theme yet, follow this tutorial on How to Create a Child Theme for Customization. It will guide you through the process and ensure that your customizations remain intact even after theme updates.

Edit Child Theme’s functions.php File

Begin by opening the functions.php file of your WordPress child theme. This file serves as the central hub for customizing your theme’s features. You have the option to make direct modifications through the Theme Editor in your WordPress dashboard or choose a more advanced approach by using an external code editor along with FTP (File Transfer Protocol). Insert the provided code snippet at the conclusion of the file to integrate the desired functionality.

/**
 * Add custom Meta Tag to header for light and dark browser theme favicons.
 */
function custom_light_dark_browser_favicons() {
	// Echo the light browser theme favicon link tag.
	echo '<link href="' . esc_url( site_url() ) . '/wp-content/uploads/2024/02/hoolite_favicon.png" rel="icon" media="(prefers-color-scheme: light)">';

	// Echo the dark browser theme favicon link tag.
	echo '<link href="' . esc_url( site_url() ) . '/wp-content/uploads/2024/02/hoolite_favicon_light.png" rel="icon" media="(prefers-color-scheme: dark)">';
}
add_action( 'wp_head', 'custom_light_dark_browser_favicons' );
Code language: PHP (php)

Explanation:
This code defines a custom function custom_light_dark_browser_favicons that echoes two <link> tags, each specifying a different favicon image based on the user’s preferred browser theme color scheme. The esc_url function is used to sanitize the URLs.

Save and Test

Save the changes to the functions.php file and upload it back to your child theme folder. Visit your WordPress site and test the custom favicon functionality by switching between light and dark browser themes (if your browser supports it). Observe the favicon changing accordingly.

That’s it! You’ve successfully implemented a custom favicon solution for light and dark browser themes in your WordPress child theme without the need for plugins. This small but impactful customization enhances the user experience on your site.

If you’re looking to further enhance your WordPress site’s customization, check out our tutorial on How to Add Custom Meta Tags to HTML Head in WordPress via functions.php. This guide will walk you through adding crucial meta tags for a strong SEO strategy, contributing to a unique and well-structured online presence.

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