Creating your own custom wordpress login page is a lot easier than you may think. First you will need to open the functions.php file for the theme you are going to be using.

This should be located at
~/public_html/wp-content/themes/yourtheme/functions.php

You will also need to add the CSS below to your theme’s style.css file, this should be located at

~/public_html/wp-content/themes/yourtheme/style.css

Replace yourtheme with the theme you will be using.

Example Preview

You will need to add the following lines of code to the bottom of your functions.php file:

Full Code

Also add the following CSS to your theme’s style.css file, and customize to use your image, image size, etc..

Breakdown

Create a function to return a URL

First we will create the function that will return the URL we want the link to use.

The code above will use the default URL configured in WordPress settings.  If you want to use a custom URL then use this code instead:

Add filter to change the URL for the link

Next we will use add_filter (WordPress Codex)  to add a filter that will change the link URL for the image on the login page by calling the function we created above that will return the URL.

Add CSS to modify image and background

Finally we will add the CSS to our theme’s style.css file, which we can customize to use our own image, or styling.

TIP: Make sure you don’t accidentally put this code at the VERY bottom of the page because it still need to be included inside the standard PHP tags. This means the very last characters in the functions file should be ?> which is the closing tag for a PHP script. This must be at the very bottom or you will have problems.