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Set Default Image size on Attachment pages

I was recently asked by a client to make the default image size that appears on attachment pages in WordPress to a larger images size.  To be honest, I never gave the attachment pages in WordPress a second thought.  They just showed single images or documents from the media library… big woop.  Or so I thought.  

This particular client put Adsense ads onto the attachment pages and was making a revenue stream off of those images due to traffic coming into his site via Google Image search.  By default the images in my theme (The News theme from StudioPress) were set to Medium  He wanted the images to be Large so they were more dramatic when visitors came into the pages from Google.

Thankfully it was an easy fix

How to set the Default image size on Attachment Pages in WordPress (Genesis Framework)

Drop this code into the functions.php file

/*Set default image size on the attachment pages*/

add_filter('prepend_attachment', 'ag_prepend_attachment');
function ag_prepend_attachment($p) {
   return '<p>'.wp_get_attachment_link(0, 'large', false).'</p>';

To change the image size, just change ‘large’ in the above code to whatever default image size you want to show. The default media sizes in pixels are set in WordPress under Appearance–>Media

Vincent Wondra

Founder & President of BBS, Bootstrap Business Solutions a WordPress website development and design agency. He believes that every business deserves an easy to update, scalable, versatile, and stable website. Follow me on Google