EDIT. I got this working, see my own answer below:

Now, if someone has any clue as to how I can get this sortable, please chime in! :)

---------------- Original question ----------------

How can I add a custom column to the attachment post type? I'm finding ways to add them to posts, pages or custom post types. But for native post types like attachments, how?

I would like to display the attachment file size in it's own column.

  • Please show us what have you tried so far. Jul 28, 2015 at 8:44
  • I got it working and updated the original question. If anyone knows how to get it sortable aswell, that would be a great contribution.
    – Johan Dahl
    Jul 28, 2015 at 8:52
  • Please post your solution as an answer, which is how it works on WPSE - thanks! Jul 28, 2015 at 8:59
  • Thanks for telling me, I just did - can't accept it until 2 days though!
    – Johan Dahl
    Jul 28, 2015 at 9:13
  • Yea, one has to wait, but on the other hand you can even earn a badge for answering your own question :) If you want me or others to get the message add @username. I think - not 100% certain, but almost - you have to take a look at manage_uploads_sortable_columns for the sorting functionality. Jul 28, 2015 at 9:25

1 Answer 1


Working code:

// Add custom column with file size info to attachment page
add_filter( 'manage_media_columns', 'bb2_manage_media_columns', 10, 2 );
function bb2_manage_media_columns( $columns )
    $columns['filesize'] = __( 'Storlek', 'bb2' );
    return $columns;

add_action( 'manage_media_custom_column', 'bb2_manage_media_custom_column', 10, 2 );
function bb2_manage_media_custom_column( $column_name, $id )
    switch ( $column_name )
        case 'filesize' :
            $bytes = filesize(get_attached_file($id));
            echo size_format($bytes);

        default :

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