WP HTML Minify

// WP HTML Minify / Kiri Vadivelu / 2026

add_action('template_redirect', 'wp_html_minify_start');

function wp_html_minify_start() {

    // Only minify for front-end HTML pages

    if (is_user_logged_in() || !is_singular() && !is_home() && !is_front_page()) return;

    ob_start('wp_html_minify_finish');

}

function wp_html_minify_finish($html) {

    $original = $html;

    // Remove HTML comments 

    $html = preg_replace('/<!--(?!\[if).*?-->/s', '', $html);

    // Remove whitespace between tags

    $html = preg_replace('/>\s+</', '><', $html);

    // Remove newlines and tabs

    $html = str_replace(array("\r\n", "\r", "\n", "\t"), '', $html);

    // Collapse multiple spaces

    while (stristr($html, '  '))

        $html = str_replace('  ', ' ', $html);

    // Show compression stats (remove in production)

    $saved = strlen($original) - strlen($html);

    $html .= "\n<!-- Minified: saved " . $saved . " bytes -->";

    return $html;

}