Free Custom CSS Plugins to style your website without breaking code

WordPress being an easy to use web development platform, users usually take advantage of its flexibility to customize their site by adding custom code to enhance the design of their theme. However if you are doing it straight at the codes, it is easy to break or crush your site and create design issues if you add custom CSS code without proper knowledge.

The good thing is that WordPress themes are improving and come with readily available theme options to add custom code to change the default design per your specific liking. Normally you need to go to the CSS section at Appearance » CSS tab or Themes » Customize page » Additional CSS tab. If you are unlucky and your WordPress theme doesn’t come with the default option to add custom CSS you can use any of the following WordPress plugins to add custom code.

Here are some of the free plugins to extend the styling functions of your theme without breaking code.

Simple Custom CSS

An easy-to-use WordPress Plugin to add custom CSS styles that override Plugin and Theme default styles. This plugin is designed to meet the needs of administrators who would like to add their own CSS to their WordPress website. Styles created with this plugin will render even if the theme is changed.


  • Customizer Control
  • Useful Code Syntax Highlighter
  • Code linting (error checking)
  • No configuration needed
  • Simple interface built on WordPress UI
  • Virtually no impact on site performance
  • No complicated database queries
  • Thorough documentation
  • Allows Administrator access on WP Networks (Multisite)

Simple Custom CSS and JS

This Custom CSS Plugin allows you to customize your WordPress site’s appearance by easily adding custom CSS and JS code without even having to modify your theme or plugin files. This is perfect for adding custom CSS tweaks to your site.


  • Text editor with syntax highlighting
  • Print the code inline or included into an external file
  • Print the code in the header or the footer
  • Add CSS or JS to the frontend or the admin side
  • Add as many codes as you want
  • Keep your changes also when you change the theme

Simple CSS

Simple CSS gives you an awesome admin editor and a live preview editor in the Customizer so you can easily add your CSS.

Want your CSS to only apply on a specific page or post? Simple CSS adds a metabox which allows you to do just that.

Features include:

  • Full featured admin CSS editor
  • Dark and light editor themes
  • CSS editor in the Customizer so you can live preview your changes
  • Metabox for page/post specific CSS

WP Add Custom CSS

WP Add Custom CSS allows you to add custom CSS to the whole website and to individual posts, pages and custom post types (such as Woocommerce products).
The CSS rules applied to the whole website will override the default stylesheets of your theme and plugins, while the CSS rules applied to specific pages, posts or custom post types will override the main stylesheet too.

You can edit the main stylesheet from the the “Add custom CSS” settings page.
The plugin also creates a new “Custom CSS” box in the editing area to add custom CSS to specific posts, pages and custom post types.

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