Are you looking for a way to add custom attribute to image using
the_post_thumbnail()? While there’s probably a plugin for this, we have created a quick code snippet that you can use to add custom attribute to image using
the_post_thumbnail() in WordPress.
The code below will allow you to add the custom attribute of
'itemprop'="image" to your images, but you can change that to nearly anything, including class, alt, title, etc.
All you have to do is add this code to your theme’s single.php file or in a site-specific plugin:
the_post_thumbnail( 'thumbnail', array('itemprop'=>'image') );
Note: If this is your first time adding code snippets in WordPress, then please refer to our guide on how to properly add code snippets in WordPress, so you don’t accidentally break your site.
If you liked this code snippet, please consider checking out our other articles on the site like: 10 best WordPress testimonial plugins to add social proof and how to set up author tracking in WordPress with Google Analytics.