Jeremy Ross

<p>Field to select registered image sizes within the WordPress dashboard.</p>
<h3>Compatibility</h3>
<p>This ACF field type is compatible with:<br />
* ACF 5</p>
<h3>How to Use</h3>
<p>Once activated, this plugin will create a <em>Image Size</em> field type in ACF.  This field type will list all registered field types as a drop down within the field group.</p>
<p>To use this field within your custom templates you will use the following code:</p>
<pre><code>$my_image_id   = get_field('my_image_id');    // ACF Image return type set to ID for this demo
$my_image_size = get_field('my_image_size');  // The selected image size (eg. large)

echo wp_get_attachment_image( $my_image_id, $my_image_size );  // Output the image based on the ID, and the Image Size selected.
</code></pre>


Advanced Custom Fields: Image Size Select Field

Field to select registered image sizes within the WordPress dashboard.

corgux

<p>With this plugin you can set the minimum/exact width and height required for featured images used in standard and custom posts. You can also customise the error message shown to the user when an image isn’t large enough. Supports the Gutenberg Block Editor.</p>


Minimum Featured Image Size

Straightforward and well written plugin. Very handy to help enforce beautiful featured imagary on your clients sites.

Perfect

Love a well designed, easy to use plugin. A few features that make it even better, but I just plugged in my minimums and it took care of everything else from there.

It works, it's simple, it puts the settings in the right place!

Set the minimum size required for featured images

Advanced Custom Fields: Image Size Select Field vs Minimum Featured Image Size