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How to use edit_custom_thumbnail_sizes filter in WordPress

Sandeep Kumar Mishra
Sandeep Kumar Mishra
July 12, 2022
5 minutes read

edit_custom_thumbnail_sizes filter

Filters whether custom sizes are available options for image editing.

To use edit_custom_thumbnail_sizes filter, first you have to register it using add_filter. You can write this code into functions.php of your activated theme or in a custom WordPress Plugin.

We at Flipper Code, always prefer to create a custom WordPress Plugin while using hooks so nothing breaks when you update your WordPress Theme in the future.

In the below live example, we have defined a function modify_edit_custom_thumbnail_sizes_defaults which takes 1 parameters and we registered using add_filter. The first parameter edit_custom_thumbnail_sizes is name of the hook, The second parameter modify_edit_custom_thumbnail_sizes_defaults is name of the function which need to be called, third parameter is the priority of calling the hook if same hook is used multiple times and the last parameter is the number of arguments (if any) to be passed in the registered function.

Sometime, you have to remove a registered hook so you can use remove_filter to remove edit_custom_thumbnail_sizes filter.


    Below the 1 parameter is required to use this hook.

  • $edit_custom_sizes : (bool|string[]) True if custom sizes can be edited or array of custom size names.

Live Example

apply_filters( 'edit_custom_thumbnail_sizes', bool|string[] $edit_custom_sizes )

Below is an example how you can use this hook.

                        function modify_edit_custom_thumbnail_sizes_defaults($edit_custom_sizes) { 
                            // Update the $edit_custom_sizes variable according to your website requirements and return this variable. You can modify the $edit_custom_sizes variable conditionally too if you want.

                            return $edit_custom_sizes; 
                        // add the filter
                        add_filter( "edit_custom_thumbnail_sizes", "modify_edit_custom_thumbnail_sizes_defaults", 10, 1 );

To remove a hook callback, use the example below.

remove_filter( "edit_custom_thumbnail_sizes", "modify_edit_custom_thumbnail_sizes_defaults", 10, 1 );

Please make sure provide the same callback function name, priority and number of arguments while removing the hook callback.

Flipper Code is a Premium WordPress Plugins development company and integrating new functionalites into WordPress sites in form of custom WordPress Plugins since 2012. If you’re having any trouble using this hook, please contact our WordPress Development Team and we’d be happy to assist you.

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