ООО «ЭйВиДи-системы»

This plugin allows you to customize the logo on the WordPress login screen. There is zero configuration. You just drop the logo file into your theme WordPress and this plugin takes over.
Note that you should use a transparent background on the PNG custom logo, crop it tightly (no padding pixels) and use a width of exactly and min 312 pixels for best results. Wider images will be downscaled in modern browsers, but it isn’t recommended to rely on that.
This plugin also works in the <code>mu-plugins</code> directory.

SK-Elib

Customize the logo on the WP login screen. Using a custom logo from your WP theme. CSS is automatic!

Kerry Webster

Features of the Branded Login Screen plugin:
<ul>
<li>FULL SCREEN BACKGROUND IMAGE</li>
<li>USE YOUR OWN HEADER IMAGE IN PLACE OF THE WORDPRESS LOGO</li>
<li>POSITION LOGIN FORM: LEFT, CENTER OR RIGHT / TOP, MIDDLE</li>
<li>LOGIN FORM IS RESPONSIVE FOR SMALLER SCREENS</li>
<li>SCROLLING OF FORM IF OUTSIDE OF VIEWPORT</li>
<li>BACKGROUND IMAGE SIZES WITH WINDOW RESIZE</li>
<li>REPEATING BACKGROUND IMAGES SUPPORTED</li>
<li>REMOVES ALL WORDPRESS BRANDING</li>
<li>STILL UPGRADE PROOF</li>
</ul>

Branded Login Screen

Update the WordPress Login Screen to use a hi-res, full screen, resizing background image. Now completely responsive.

SK-Elib vs Branded Login Screen