Fit to page width as default

You can read about using the Zoom values in this doc article: https://wp-pdf.com/premium-instructions/shortcodes/#zoom

The default value can be applied on a per-shortcode/per-block level.

The default value can be applied on a per-shortcode/per-block level.

Sorry I didn’t understand, you mean I have to edit every single shortcode and there is no default?

As far as I remember, you are using a paid version of the plugin.

Here is a code snippet that you can put into the /wp-content/mu-plugins/tweak-pdfembedder.php file and that will set the default value for all shortcodes/blocks regardless of their settings:

add_filter( 'pdfemb_premium_viewer_strings', static function( $atts ) {
	$atts['zoom']   = 'page-actual';
	$atts['fpzoom'] = 'page-actual';

	return $atts;
} );

You can read here or here how to do that.

It works perfectly, thank you!