Is there a way to limit the dimensions of the full size uploaded image (made normally through the Media library)?

I have clients that upload huge images files with resolutions sometimes greater than 5000 x 5000. They don't quite understand why Wordpress/websites have a hard time with these images.

Limiting "Full" size images seems like a great solution. Is it possible via functions.php?

  • I know there is a way to do this as I've seen some Plugins that allow this feature, I will have a look into it if no one gives you an answer
    – Stephen
    Commented Jan 26, 2016 at 19:14
  • I'd love to do it manually, but I've just discovered this plugin: wordpress.org/plugins/imsanity Commented Jan 26, 2016 at 19:14
  • I have the solutions I think, I will post it
    – Stephen
    Commented Jan 26, 2016 at 19:15
  • We have used info from this codex page to set img sizes for media (although you set them also in the back-end in Settings/Media ) and used this wpse answer to keep the folder on the server 'clean and uncluttered'. For us it works like a charm and the client is also satisfied with the results.
    – Charles
    Commented Jan 26, 2016 at 19:38
  • 1
    Imsanity plugin is good for sure, but if you want to do handle both image optimization and size limiting, I find wordpress.org/plugins/ewww-image-optimizer is a better option now they recently also added image resizing functionality.
    – Trevor
    Commented May 18, 2016 at 1:46

2 Answers 2


So I've found this WP_Image_Editor in the CodeX. Basically by adding the code below it should automatically resize an image :)


$image = wp_get_image_editor( 'cool_image.jpg' ); // Return an implementation that extends WP_Image_Editor

if ( ! is_wp_error( $image ) ) {
    $image->resize( 300, 300, true );
    $image->save( 'new_image.jpg' );

I don't know exactly if this will work but I'm sure if you look in the link I've gave you then you should be able to find it there.

Best of luck :)


I have found this in quora , if anyone has any other method to resize especially old uploaded images ,

function ad_limit_media_file_max_size($image_data) { 
    if (!isset($image_data['sizes']['large'])) return $image_data; 
    $upload_dir = wp_upload_dir(); 
    $uploaded_image_location = $upload_dir['basedir'] . '/' .$image_data['file']; 
    $current_subdir = substr($image_data['file'],0,strrpos($image_data['file'],"/")); 
    $large_image_location = $upload_dir['basedir'] . '/'.$current_subdir.'/'.$image_data['sizes']['large']['file']; 
    $image_data['width'] = $image_data['sizes']['large']['width']; 
    $image_data['height'] = $image_data['sizes']['large']['height']; 
    return $image_data; 

Quora link: https://www.quora.com/Is-it-possible-to-create-a-child-theme-in-WordPress-that-loads-faster-than-its-parent Good luck

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