Snippet to change the default WordPress login logo, link, and title. https://endurtech.com/replace-wordpress-login-logo-link-title/

replace-wordpress-login-logo-link-title.php

<?php

// Replaces the WordPress Login Logo, Link, & Title
// https://endurtech.com/replace-wordpress-login-logo-link-title/

# WordPress Login Logo Replacement
add_action( 'login_enqueue_scripts', 'endurtech_login_logo' );
function endurtech_login_logo()
{
  # Use echo below if image resides in your Media Library
  echo '<style>#login h1 a{background-image:url(' . home_url() . '/wp-content/uploads/YYYY/MM/custom-logo.png) !important; background-size:contain !important; width:100% !important; height:100px !important;}</style>';
  # Use echo below if image resides in your Themes Directory
  # echo '<style>#login h1 a{background-image:url(' . get_stylesheet_directory_uri() . '/images/custom-logo.png) !important; background-size:contain !important; width:100% !important; height:100px !important;}</style>';
}

# WordPress Login Link Replacement
add_filter( 'login_headerurl', 'endurtech_login_logo_url' );
function endurtech_login_logo_url()
{
  # Just links to sites' homepage
  # Replace home_url() with your custom URL
  return home_url();
}

# WordPress Login Title Replacement. Replaces 'Powered by WordPress'.
add_filter( 'login_headertitle', 'endurtech_login_logo_url_title' );
function endurtech_login_logo_url_title()
{
  # Just displays the sites' name
  # Replace get_bloginfo('name') with your custom title. Example 'Managed & Maintained by ENDURTECH';
  return get_bloginfo('name');
}

?>