In case you don't know if your webserver is already configured well and can use WebP, please follow these steps to check:

1. Create a new testwebp.php  file in your Magento 2 root directory.

2. Add this code to it:

<?php 

$errorSufix = '<br/>Please enable it in your hosting configuration or ask the server administrator to help you with this.</strong>';

if (!function_exists('gd_info')) {
   echo ('<strong style="color:red">Error: GD is not enabled in PHP settings.' . $errorSufix);
exit(); } $hasWebP = false; foreach (gd_info() as $key => $value) { if (stristr($key, 'webp')) { $hasWebP = true; break; } } if (!$hasWebP) { echo ('<strong style="color:red">Error: WebP option is not enabled in PHP GD.' . $errorSufix);
exit(); } if (!function_exists('imagecreatefromwebp')) { echo ('<strong style="color:red">Error: imagecreatefromwebp function does not exist.' . $errorSufix);
exit(); } echo ('<strong style="color:green">Success.<br/>Your PHP settings are ready for WEBP.</strong>');

 

3. Save the file.

4. Open this URL in your browser https://mydomain.com/testwebp.php.

If you cannot access testwebp.php in your browser, then try to run CLI command inside Magento 2 folder:

php testwebp.php

If you see the success message, then your server is ready for WebP. If not, you will need to change the PHP settings in the hosting panel or ask the server administrator to set configurations.