Is there a way to make WordPress process Full size images, which by default it leaves unmodified?

  • Unmodified as in not resizing the picture? Your question is a bit ambiguous.
    – mystline
    Apr 13, 2012 at 8:45
  • Problem: people upload huge images and WordPress leaves them as they are. I need to find a way to optimize Full size images, but there is no such option in the admin area.
    – Dan
    Apr 13, 2012 at 10:07
  • Under Media, you have 3 sizes options by default.
    – Wyck
    Apr 13, 2012 at 15:09
  • yup, but I need to compress the "Full size" image as the title and my question obviously state.
    – Dan
    Apr 14, 2012 at 4:26

1 Answer 1


Yes, there is.

Found here:

It will replace the original picture with the large size, defined in Media Settings (/wp-admin/options-media.php).

Here's the code:


function replace_uploaded_image($image_data) 
    // if there is no large image : return
    if ( !isset($image_data['sizes']['large']) ) 
        return $image_data;

    // paths to the uploaded image and the large image
    $upload_dir              = wp_upload_dir();
    $uploaded_image_location = $upload_dir['basedir'] . '/' . $image_data['file'];
    $large_image_location    = $upload_dir['path'] . '/' . $image_data['sizes']['large']['file'];

    // delete the uploaded image

    // rename the large image
    rename($large_image_location, $uploaded_image_location);

    // update image metadata and return them
    $image_data['width']  = $image_data['sizes']['large']['width'];
    $image_data['height'] = $image_data['sizes']['large']['height'];

    return $image_data;

It is possible to use it with a custom size:

add_image_size( 'new-large', 1600, 1200 ); 

Changing all the occurrences of $image_data['sizes']['large'] in the original code with $image_data['sizes']['new-large']

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