Custom CSS and JavaScript allows you to add custom internal and external CSS and JavaScripts to individual posts.
As of April 2026, Custom CSS and JS is a WordPress css plugin with 900 active installations and a 0/5 rating0. It has been downloaded 12K+ times in total. Requires WordPress 2.8+ and PHP false+. Available on WordPress.org since 2010. Last updated 15 years ago — may have compatibility concerns. Downloads are down 26% this week. Top alternative: WPCode – Insert Headers and Footers +….
Custom CSS and JS allows you to add stylesheets and JavaScripts to any individual post by adding custom fields. Both CSS and scripts can be either internal or external. Since this is a plugin, the custom CSS and JavaScript are available to any theme used to display the post, as long as the themes call “wp_head”.
To use the plugin, add any combination of the following custom fields to your post.
custom_css
Add an external stylesheet by adding a custom field with the name custom_css. The value of the field should be the path to your css file.
cusrom_css_code
Add an internal stylesheet by adding a custom field with the name custom_css_code. Include your CSS code as the value. (Do not include the style tags.)
custom_js
Add an external JavaScript by adding a custom…
| WordPress | 2.8+ requiredTested up to 2.9.2 |
| PHP | false+ required |
Plugin data sourced from WordPress.org. Analysis and metrics by PluginSift.