How To Add Custom Image Sizes to the Add Media Dialog Box

Snippets by IsItWP

Do you want to add custom image sizes to the Add Media dialog box? With this little snippet, you can add custom image sizes to the Add Media dialog box.


All you have to do is add this code to your theme’s functions.php file or in a site-specific plugin.

Optionally add more image sizes to the if statement on line 1 through 3.

if ( function_exists( 'add_image_size' ) ) {
    add_image_size( 'new-size', 300, 100, true ); //(cropped)
add_filter('image_size_names_choose', 'my_image_sizes');
function my_image_sizes($sizes) {
        $addsizes = array(
                "new-size" => __( "New Size")
        $newsizes = array_merge($sizes, $addsizes);
        return $newsizes;

Note: If this is your first time adding code snippets in WordPress, then please refer to our guide on how to properly copy / paste code snippets in WordPress, so you don’t accidentally break your site.

If you liked this code snippet, please consider checking out our Envira Gallery Review.

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