Is there a standard way to get all the registered sizes of the featured images? One can register different sizes with add_image_size(). What I need, is to get all the sizes of a featured image of a post. Something like this:

$sizes = get_post_feature_image_sizes($postid);

...which will return an array of objects like this (here in JSON format):

{width: 200, height: 300, url: 'http://.........../wp-content/uploads/2015/10/file-200x300.jpg'},
{width: 300, height: 400, url: 'http://.........../wp-content/uploads/2015/10/file.jpg'},

Is there anything like this, or I will have to scan all the upload folder file names with regex?

  • The featured image is just the ID of an attachment, all the standard attachment APIs should work on it
    – Tom J Nowell
    Oct 25, 2015 at 14:23

3 Answers 3


I don't remember a function that will do precisely that, but it is easily achieved with API overall:

  1. Retrieve attachment ID with get_post_thumbnail_id()
  2. Retrieve available sizes with get_intermediate_image_sizes()
  3. For each size use wp_get_attachment_image_src(), which gives precisely data you need (URL and dimensions).
  • Thanks, that helped a lot! :) This is my first time developing with WP and the API and the terminology is a bit frightening. :)
    – NoOne
    Oct 26, 2015 at 14:40
  • is there any way to retrieve the current post's generated featured image size, width and height. For example if the the featured image set is of size 540 x 400, although it should be of 550 x 550. How to retrieve the current post's featured image size to store $width = 540 & $height = 400 in the current example.
    – Nimesh
    May 6, 2018 at 22:51
  • @Nimesh wp_get_attachment_metadata($attachment_id) will get you what you need.
    – jave.web
    Sep 28, 2018 at 18:00

After you get it's ID ( get_post_thumbnail_id($YOUR_POST_ID) ) you need to know the uploads base url and the attachment meta data.

Uploads base url can be found in an array returned by wp_upload_dir().

Attachment meta data can be retrieved by wp_get_attachment_metadata().

Here is a handy function I wrote that prepares the url data for any image attachment, not just featured.

function prepareImageData( $attachment_id ){
  $uploads_baseurl = wp_upload_dir()['baseurl'];

  $prepared = [];
  $data = wp_get_attachment_metadata($attachment_id);
  $prepared = [
    'mime_type' => get_post_mime_type($attachment_id),
    'url' => $uploads_baseurl.'/'.$data['file'],
    'sizes' => [],

  foreach( $data['sizes'] as $size => $sizeInfo ){
    $prepared['sizes'][$size] = [
      'url' => $uploads_baseurl.'/'.$sizeInfo['file'],

  return $prepared;
  • 1
    excellent! You might also lik to add $dir = pathinfo( $data['file'] )['dirname']; to use as: 'url' => $uploads_baseurl.'/'.$dir.'/'.$sizeInfo['file'], as they might miss the year/month directories Feb 11, 2021 at 14:51

To get image according to size you can use wordpres pre-defined function that is the_post_thumbnail( $size, $attr ).

you can use predefined media sizes.


the_post_thumbnail( 'thumbnail' );       // Thumbnail (default 150px x 150px max)
the_post_thumbnail( 'medium' );          // Medium resolution (default 300px x 300px max)
the_post_thumbnail( 'large' );           // Large resolution (default 640px x 640px max)
the_post_thumbnail( 'full' );            // Full resolution (original size uploaded)

the_post_thumbnail( array(100, 100) );

This might help you.

  • The point of the question is that the OP was looking to find the names of all available image sizes including any additional sizes created by the theme &/or plugins. Aug 7, 2017 at 20:16

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