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Wordpress, how to set the default embed image size

In a post or page, when you add an image into the article content, there is these options:



It uses size medium as default, if you want to set “full” as default, here is what you can do:


Bring up the funtions.php file

Appearance >> Editor --> Theme Functions (functions.php)


Inside the action function for “after_setup_theme”, which means what to do after the theme is setup, add the following, in my case it is like this:


add_action('after_setup_theme', 'swiss_setup');

function swiss_setup()


    update_option('image_default_size', 'full' );



Now when you add a new post, and want to embed an image, the original size option will be set to default.