Hi there,

You can do that by installing Simple Image Sizes plugin and set a custom size for the thumbnails and then make sure you regenerate these thumbnails so the changes will be applied.

Hi Yannis,

Can you please share your site credentials here, because we need to login to your site and see this issue live. Your information is safe (private) in this thread.

To include your credentials click Insert Credentials button in editor toolbar. (See how)

Hi Yiannis,

I have added the following code in functions.php of child theme:

// WooCommerce Product Image Gallery Thumbnails Size
function woocommerce_custom_gallery_image_size( $size ) {
	return array( 68, 102 );
}

add_filter( 'woocommerce_gallery_image_size', 'woocommerce_custom_gallery_image_size' );

And it fixed the issue:

(view large image)

I hope you like it.

Hi Yiannis,

I have modified the piece of code that I have added with this one:

// WooCommerce Product Image Gallery Thumbnails Size
function woocommerce_custom_gallery_image_size( $size ) {

	if ( 'woocommerce_gallery_thumbnail' === $size ) {
		return array( 68, 102 );
	}

	return $size;
}

add_filter( 'woocommerce_gallery_image_size', 'woocommerce_custom_gallery_image_size' );