Image Max Pixel

// Image Max Pixel / Kiri Vadivelu / 2026

add_filter('wp_handle_upload_prefilter', 'image_max_pixel');

function image_max_pixel($file) {

    $image = getimagesize($file['tmp_name']);

    if ($image[0] > 4000 || $image[1] > 4000) {

        $file['error'] = 'Image too large (max 4000×4000).';

    }

    return $file;

}