Custom CSS and JavaScript
This plugin allows you to add custom site-wide CSS styles and JavaScript code to your WordPress site. Useful for overriding your theme’s styles and adding client-side functionality.
Consider an alternative
Custom CSS and JavaScript shows warning signs in 2026 — compare the alternatives below before installing. It runs on 10K+ sites, is rated 4.7/5 and was last updated 2 years ago, and scores 35/100 on our health check.
- Proven at scale on 10K+ active sites
- Loved by users — 4.7/5 from 60 reviews
- No update in 2 years
- Only tested up to WordPress 6.6 (latest is 7.1)
How does it stack up?
Side-by-side on installs, updates, ratings & supportDaily downloads
Download spikes usually follow a new release — each site that auto-updates counts as a download.
Rankings
Where Custom CSS and JavaScript stands todayWordPress.org search rankings
Live position in the plugin search, top 100| Keyword | Position |
|---|---|
| custom css | >100 |
| custom javascript | #64 |
| javascript | #50 |
| styles | >100 |
| stylesheet | >100 |
Version adoption
Share of active sites per release.
Rating breakdown
★★★★★★★★★★ 4.7 from 60 reviews
About Custom CSS and JavaScript
From the official readme · v2.0.16Description
This plugin allows you to add custom site-wide CSS styles and JavaScript code to your WordPress site. Useful for overriding your theme’s styles and adding client-side functionality.
Features:
- Code editor with syntax highlighting and AJAX saving to avoid reloading the editor at each save.
- Save and preview your CSS and JavaScript as a draft that is only applied to logged-in users with the necessary permissions until you are ready to publish your changes to the public.
- View and restore past revisions of your CSS and JavaScript.
- Automatically minify your custom CSS and JavaScript code to reduce file size.
- For the public, custom CSS and JavaScript code is served from the filesystem instead of the database for optimal performance.
Now available! Custom CSS and JavaScript Developer Edition:
- Divide your CSS and JavaScript into multiple virtual files to keep your code organized (the code is still served as one CSS and one JS file on the front-end for efficiency).
- Supports Sassy CSS (SCSS)!
- Live preview for CSS!
- Upload and download CSS and JavaScript files, individually or in ZIP files.
- The developer logo and review/donation links are removed from the editor page in the WordPress admin.
Click here to purchase!
Alternatively, you can manually upload the plugin to your wp-content/plugins directory.
If you like this plugin, please consider leaving a comment or review.
User Access Control
In the Custom CSS and JavaScript WordPress plugin, access to plugin features is determined by user capabilities. Users with the edit_theme_options capability will enjoy full access to all the plugin’s features.
By default, the “Administrator” and “Editor” roles come equipped with the edit_theme_options capability. However, site administrators have the flexibility to customize these capabilities and assign them to other roles or individual users through plugins or custom code.
Furthermore, to provide users with enhanced control, we’ve introduced a custom capability known as wpz_custom_css_js. Users possessing both the wpz_custom_css_js and edit_posts capabilities can be granted access to the plugin’s features.
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Installation
- Click “Plugins” > “Add New” in the WordPress admin menu.
- Search for “Custom CSS and JavaScript”.
- Click “Install Now”.
- Click “Activate Plugin”.
Changelog
2.0.16 – August 29, 2023
- Revert changes related to the admin page slug change
2.0.15 – August 23, 2023
- Introduce
wpz_custom_css_jscapability
2.0.14 – August 21, 2023
- Fix: error on save “security token expired”
- Compatibility with PHP 8
- Load minified files on admin page
- Change admin page title from h2 to h3
- Add addons tab
- Admin page rebrand
2.0.13 – August 17, 2023
- Add notice about new plugin, AI Image Lab
2.0.12
- Updated links, author, changed branding to AGS,
- Updated tested up to,
- Removed donation links,
- Added aspengrovestudios as contributor
2.0.11
- Fix: Issue with previous update if the admin JavaScript file was already in the browser cache
For developers
Is this your plugin? Show off the numbers.
Add a live badge to your site, docs or GitHub README. It updates on its own — no account needed.
Best Custom CSS and JavaScript alternatives
All custom css plugins →FAQ
Custom CSS and JavaScript: quick answers
Straight answers, pulled from live WordPress.org data.
Live data from WordPress.org · checked Sep 27, 2026
Is Custom CSS and JavaScript free?
Yes. Custom CSS and JavaScript is free to download and use from the official WordPress.org plugin directory.
Is Custom CSS and JavaScript safe to use in 2026?
Custom CSS and JavaScript shows warning signs in 2026 — compare the alternatives below before installing. It runs on 10K+ sites, is rated 4.7/5 and was last updated 2 years ago, and scores 35/100 on our health check.
How many websites use Custom CSS and JavaScript?
Custom CSS and JavaScript is active on 10K+ WordPress websites and has been downloaded 179,633 times since it launched in December 2015. It was downloaded 606 times in the last 30 days.
Does Custom CSS and JavaScript work with WordPress 7.1?
Custom CSS and JavaScript is officially tested up to WordPress 6.6.9, while the latest release is 7.1.2. It may still work, but try it on a staging site first.
When was Custom CSS and JavaScript last updated?
The latest version, 2.0.16, was released on August 12, 2024 (2 years ago).
Who makes Custom CSS and JavaScript?
Custom CSS and JavaScript is developed and maintained by WP Zone.
What are the best alternatives to Custom CSS and JavaScript?
The most popular alternatives to Custom CSS and JavaScript are Simple Custom CSS and JS (600K+ installs), Insert Headers And Footers (300K+ installs) and Simple Custom CSS Plugin (100K+ installs).
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