Sadhan Pal

Login Login Logo allows you to personalize your WordPress login page by replacing the default WordPress logo with your own custom image. 
With a simple interface and live preview, you can brand the login page to match your website or business identity.
Features: 
* Upload a custom login logo directly from the WordPress media library. 
* Set logo width and height with min/max dimension validation. 
* Preview the logo before saving. 
* Clear/reset the logo with a single click. 
* Lightweight and easy to use.
This plugin is perfect for agencies, freelancers, and site owners who want to add a professional touch to their client or business sites.
<h3>License</h3>
This plugin is open-source and licensed under the GPLv2 or later.

Cute Login Logo – Upload Your Own Custom Logo for Branding in the Login Page

Easily customize your WordPress login page by uploading and displaying your own custom logo with adjustable dimensions and preview.

Mark Jaquith

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 WordPress content directory, named <code>login-logo.png</code> and this plugin takes over.
Note that you should use a transparent background on the PNG image, crop it tightly (no padding pixels) and use a width of exactly 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.

Login Logo

Customize the logo on the WP login screen by simply dropping a file named login-logo.png into your WP content directory. CSS is automatic!

Cute Login Logo – Upload Your Own Custom Logo for Branding in the Login Page vs Login Logo