DISCLAIMER: this post is older than one year and may not be up to date with latest WordPress version.

By default, built-in WordPress galleries use the size “full” for the image but in some cases it’s better set a different size. Here is an easy to use code snippet to set the default image size in your galleries.

Simply paste the following snippet into your functions.php file:

remove_shortcode('gallery');
add_shortcode('gallery', 'custom_size_gallery');
 
function custom_size_gallery($attr) {
     $attr['size'] = 'medium';
     return gallery_shortcode($attr);
}

The desired size can be changed on line 5.

Thanks to emoticode for the cool tip!

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One Comment

  1. You can filter the parameters passed to the gallery shortcode, without the need to change the shortcode handler: https://gist.github.com/shazdeh/8188033

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