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Best WordPress Custom CSS Plugins in 2026

Data from WordPress.org Updated First published 5 min read

Somewhere safe to keep style and script changes that survive theme updates.

WordPress has a customizer field for additional CSS, so these plugins compete with a built-in feature. They win on editing comfort, on scoping styles to one page, and on holding JavaScript snippets that the core field will not take.

Together these 10 plugins run on more than 958,400 active WordPress sites. Ranked from both WordPress.org orderings for "custom-css", its tag listing and its search results.

On this page
  1. Best for each measure
  2. Quick comparison
  3. The top 10
  4. What moved
  5. How to choose
  6. Head-to-head
  7. How this list is ranked
  8. FAQ
  9. Conclusion
  10. Other rankings

Best Custom CSS Plugin for each measure

One plugin per measure, taken from the same WordPress.org figures as the ranking. A measure with nothing behind it is left out rather than guessed.

Most installed
Simple Custom CSS and JS

600,000+, active installs reported by WordPress.org

Highest rated
Simple CSS

4.9 out of 5, from 60 reviews, counting only plugins with at least 50

Most reviewed
Insert PHP

221 reviews, the largest body of feedback behind a score

Most recently updated
Blocks CSS

October 19, 2026, the latest release in this list

Longest established
Insert PHP

November 12, 2012, first published on WordPress.org

Custom CSS Plugins compared: rating, reviews, installs

# Plugin Rating Reviews Active installs
1 Simple Custom CSS and JS 4.4 104 600,000+
2 FluentSnippets 4.7 78 50,000+
3 Custom CSS Pro 5.0 15 7,000+
4 WP Add Custom CSS 4.8 89 60,000+
5 Blocks CSS 4.9 25 5,000+
6 Insert PHP 4.5 221 50,000+
7 Simple CSS 4.9 60 80,000+
8 Post/Page Specific Custom Code 4.6 42 6,000+
9 Simple Custom CSS 4.7 159 100,000+
10 Modular Custom CSS 5.0 6 400+

The 10 best Custom CSS Plugins, ranked by WordPress.org

Ranked from both WordPress.org orderings for "custom-css", its tag listing and its search results. Arrows show movement against the previous snapshot.

  1. 1.Simple Custom CSS and JS

    4.4 (104) 600,000+ active installs Updated Oct 8, 2026 Tested up to 7.1.3

    Easily add Custom CSS or JS to your website with an awesome editor.

    473,809 downloads in 30 days
    Stats and rankings WordPress.org Website

  2. 2.FluentSnippets

    FluentSnippets – High-Performance Code Snippets, Header & Footer Code, Custom CSS & PHP Code Manager

    4.7 (78) 50,000+ active installs Updated Aug 12, 2026 Tested up to 7.0.7

    Fast, file-based code snippets plugin. Insert header & footer scripts and add PHP, CSS, JS & HTML snippets with conditional logic. Zero DB queries.

    9,055 downloads in 30 days
    Stats and rankings WordPress.org Website

  3. 3.Custom CSS Pro

    5.0 (15) 7,000+ active installs Updated Aug 23, 2026 Tested up to 7.1.3

    Professional real-time CSS editor for those who want to code CSS.

    766 downloads in 30 days
    Stats and rankings WordPress.org Website

  4. 4.WP Add Custom CSS

    4.8 (89) 60,000+ active installs Updated Aug 14, 2025 Tested up to 6.8.11

    Add custom css to the whole website and to specific posts and pages.

    2,845 downloads in 30 days
    Stats and rankings WordPress.org Website

  5. 5.Blocks CSS

    Blocks CSS: CSS Editor for Gutenberg Blocks

    4.9 (25) 5,000+ active installs Updated Oct 19, 2026 Tested up to 7.0.7

    Blocks CSS allows you add custom CSS to your Blocks straight from the Block Editor (Gutenberg).

    8,031 downloads in 30 days
    Stats and rankings WordPress.org Website

  6. 6.Insert PHP

    ▲1

    Woody Code Snippets – Insert PHP, CSS, JS, and Header/Footer Scripts

    4.5 (221) 50,000+ active installs Updated Oct 5, 2026 Tested up to 7.1.3

    Insert PHP, JavaScript, CSS, HTML, ads & tracking code into WordPress headers, footers, pages & content with conditional logic — no theme editing.

    48,310 downloads in 30 days
    Stats and rankings WordPress.org Website

  7. 7.Simple CSS

    ▼1
    4.9 (60) 80,000+ active installs Updated Sep 15, 2025 Tested up to 6.8.11

    Add CSS to your website through an admin editor, the Customizer or a metabox for page/post specific CSS.

    1,927 downloads in 30 days
    Stats and rankings WordPress.org Website

  8. 8.Post/Page Specific Custom Code

    4.6 (42) 6,000+ active installs Updated Jul 23, 2026 Tested up to 7.0.7

    Add custom CSS to individual posts, pages, or WooCommerce products, with optional archive support and a dedicated code editor.

    832 downloads in 30 days
    Stats and rankings WordPress.org Website

  9. 9.Simple Custom CSS

    ▲1

    Simple Custom CSS Plugin

    4.7 (159) 100,000+ active installs Updated Mar 11, 2025 Tested up to 6.7.10

    Add Custom CSS to your WordPress site without any hassles.

    8,057 downloads in 30 days
    Stats and rankings WordPress.org Website

  10. 10.Modular Custom CSS

    ▼1
    5.0 (6) 400+ active installs Updated Jul 19, 2026 Tested up to 7.0.7

    WordPress core provides custom CSS functionality in the customizer that's specific to the current theme; you can switch themes freely with each t …

    166 downloads in 30 days
    Stats and rankings WordPress.org Website

What changed in the Custom CSS Plugins ranking

How to choose a Custom CSS Plugin for WordPress

  1. 1

    Compare against the built-in field first

    For a few rules, additional CSS in the customizer is enough and costs nothing. A plugin is for volume and organisation.

  2. 2

    Per-page styles keep the site light

    Rules that apply to one page should load on that page. A single growing stylesheet on every request is what these plugins should prevent.

  3. 3

    An editor with syntax checking pays for itself

    A missing brace in a global stylesheet can break the layout everywhere. Highlighting and validation catch it before saving.

  4. 4

    Never let it hold PHP

    Plugins that execute arbitrary PHP from the database are a security problem regardless of intent. Keep to CSS and JavaScript.

Custom CSS Plugin comparisons: side by side

The top four against each other on installs, ratings, reviews and updates. Each measure names its own leader; there is no overall winner.

How we rank Custom CSS Plugins

WordPress.org publishes two orderings for "custom-css" and neither is reliable alone. The tag listing covers every tag the directory files these plugins under, "custom-css" and "css-editor", and is sorted by active installs, which lets a large plugin carrying one of them loosely sit above the ones the category is about. Its search results are sorted by relevance and carry their own noise. So a plugin is placed here by where it sits across both lists: high in each one lifts it, high in only one does not. We fetch both every day at 03:00 UTC, keep every day's snapshot, and add nothing of our own. No plugin is inserted, removed or sponsored, and each entry shows its position in both lists on its own page. Full methodology.

Custom CSS Plugins FAQ

What is the best Custom CSS Plugin for WordPress?

On WordPress.org's own ranking for "custom-css", Simple Custom CSS and JS is #1 as of October 22, 2026, with 600,000+ active installs and a 4.4 out of 5 rating. By rating, Simple CSS scores 4.9 out of 5 from 60 reviews.

Which Custom CSS Plugin has the most active installs?

Simple Custom CSS and JS, with 600,000+ active installs reported by WordPress.org as of October 22, 2026. It ranks #1 in this list.

Which Custom CSS Plugin has the highest rating?

Simple CSS, rated 4.9 out of 5 by 60 reviewers on WordPress.org. Only plugins with at least 50 reviews are counted, so a single 5-star review does not win.

Which Custom CSS Plugin was updated most recently?

Blocks CSS shipped its latest release on October 19, 2026. 5 of the 10 plugins in this list were updated in the last 90 days, which is the usual sign of active maintenance.

How many Custom CSS Plugins are there on WordPress.org?

WordPress.org lists 67 plugins tagged "custom-css" and "css-editor" as of October 22, 2026. This page shows the top 10 in the directory's own order.

Why not use the customizer's additional CSS?

For a handful of rules there is no reason not to; it is built in and it survives theme updates. Plugins are better once the CSS grows: a proper editor with highlighting, styles scoped to a single page instead of the whole site, and somewhere to keep JavaScript, which the customizer field will not accept.

Is a child theme better than a Custom CSS Plugin?

For anything beyond styling, yes. A child theme can override templates and add functions, which no CSS plugin can. For pure appearance, a plugin is simpler and has one clear advantage: the styles survive a change of theme, whereas a child theme is tied to its parent.

Custom CSS Plugins: the bottom line

As of October 22, 2026, Simple Custom CSS and JS holds the #1 spot for "custom-css" on WordPress.org, followed by FluentSnippets and Custom CSS Pro. If install base matters most, Simple Custom CSS and JS leads with 600,000+ active installs. If ratings matter most, Simple CSS scores 4.9 out of 5 across 60 reviews. 3 of the 10 have not been updated in over a year, so check the last-updated column before you install.

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