How to add File Size admin column in WordPress Media Library

Looking to add file size column in the WordPress media library?

Add the following in child theme’s functions.php:

add_filter( 'manage_media_columns', 'sk_media_columns_filesize' );
/**
* Filter the Media list table columns to add a File Size column.
*
* @param array $posts_columns Existing array of columns displayed in the Media list table.
* @return array Amended array of columns to be displayed in the Media list table.
*/
function sk_media_columns_filesize( $posts_columns ) {
$posts_columns['filesize'] = __( 'File Size', 'my-theme-text-domain' );

return $posts_columns;
}

add_action( 'manage_media_custom_column', 'sk_media_custom_column_filesize', 10, 2 );
/**
* Display File Size custom column in the Media list table.
*
* @param string $column_name Name of the custom column.
* @param int $post_id Current Attachment ID.
*/
function sk_media_custom_column_filesize( $column_name, $post_id ) {
if ( 'filesize' !== $column_name ) {
return;
}

$bytes = filesize( get_attached_file( $post_id ) );

echo size_format( $bytes, 2 );
}

add_action( 'admin_print_styles-upload.php', 'sk_filesize_column_filesize' );
/**
* Adjust File Size column on Media Library page in WP admin
*/
function sk_filesize_column_filesize() {
echo
'<style>
.fixed .column-filesize {
width: 10%;
}
</style>';
}

If you would like to use a plugin for the same, here are a few options:

• Media Files Tools
• Admin Columns