Title: CSS Optimizer &#8211; Remove Unused CSS
Author: wooncherk
Published: <strong>2021年11月4日</strong>
Last modified: 2022年3月16日

---

プラグインを検索

このプラグインは **WordPress の最新3回のメジャーリリースに対してテストされていま
せん**。もうメンテナンスやサポートがされていないかもしれず、最新バージョンの WordPress
で使用した場合は互換性の問題が発生する可能性があります。

![](https://ps.w.org/css-optimizer-remove-unused-css/assets/icon-256x256.jpg?rev
=2624600)

# CSS Optimizer – Remove Unused CSS

 作者: [wooncherk](https://profiles.wordpress.org/wooncherk/)

[ダウンロード](https://downloads.wordpress.org/plugin/css-optimizer-remove-unused-css.1.7.zip)

 * [詳細](https://ja.wordpress.org/plugins/css-optimizer-remove-unused-css/#description)
 * [レビュー](https://ja.wordpress.org/plugins/css-optimizer-remove-unused-css/#reviews)
 * [開発](https://ja.wordpress.org/plugins/css-optimizer-remove-unused-css/#developers)

 [サポート](https://wordpress.org/support/plugin/css-optimizer-remove-unused-css/)

## 説明

“Remove Unused CSS” is frequently flagged in Google’s PageSpeed Insights. Indeed,
most scenario, around 70% – 80% of a page’s CSS codes are redundant, and can be 
removed without affecting the overall visual. This happens mainly because WordPress
themes and plugins are created as generic solutions that includes a bunch of features
that may or may not be used on a particular page.

Example: A theme may come with a bunch of features such as _slider_, _carousel_,
_animation_ and etc, but your home page may use only the _slider_ feature and your
about page may use only the _carousel_ feature. However, for practical reason, it’s
virtually impossible to selectively include only the required CSS rules for the 
features that were enabled on a particular page.

This is where the CSS Optimizer becomes useful. The plugin make calls to [ZippiSite](https://zippisite.com)‘
s CSS Optimizer API to find the required CSS rules on a particular page, and remove
the ones that are not needed.

## スクリーンショット

[⌊Remove Unused CSS to pass Google PageSpeed Insights (Core Web Vitals)⌉⌊Remove 
Unused CSS to pass Google PageSpeed Insights (Core Web Vitals)⌉[

Remove Unused CSS to pass Google PageSpeed Insights (Core Web Vitals)

[⌊Settings page, the only place you need to configure.⌉⌊Settings page, the only 
place you need to configure.⌉[

Settings page, the only place you need to configure.

## FAQ

### Is the CSS Optimizer API free to use?

It’s free to use with a quota of 150 API hits per months. Note that API hits does
not equals page views. In our tests on real world websites, 150 API calls is able
to serve approximately 1,000 monthly page views. In other words, the Free Plan should
suffice for small websites.

If you require more API quota, paid plans are available, starting from as cheap 
as $3 for 800 monthly API calls – approximately 5,300 monthly page views.

### What happens if there are styling issues after using this plugin?

We provide free support for all plans – even free plans. We’ll reply within 12 hours
for paid plans, and within 24h for free plan.

### What this plugin really does? Will it add extra burden to my server?

What this plugin does is to make calls to our API hosted on our server. The real
heavy-lifting is done on our server, so you don’t need to worry that the plugin 
will require extra resources.

## 評価

![](https://secure.gravatar.com/avatar/bfb00f8366e3a779a410536f4aa22aaa3a1ce0be5b3b2e212247b61ff7225649?
s=60&d=retro&r=g)

### 󠀁[Pest plugin](https://wordpress.org/support/topic/pest-plugin/)󠁿

 [Bahus](https://profiles.wordpress.org/bahus/) 2023年3月3日

The plugin simply catastrophically eats up space on the hosting.The site is 5.9 
gigabytes. Of these, 3.9 gigabytes is occupied by the plugin cache in the wp-content
folder.It’s not an optimizer plugin, it’s a pest plugin.

![](https://secure.gravatar.com/avatar/52b23f3cacf79fb5aa3ec4171c7b16074149dbab7686206d35e908bbc5dcedb7?
s=60&d=retro&r=g)

### 󠀁[Broke my site](https://wordpress.org/support/topic/broke-my-site-241/)󠁿

 [rvs2141](https://profiles.wordpress.org/rvs2141/) 2022年6月7日

After installing plugin, my site is completely broken, had to restore it with beckup.

![](https://secure.gravatar.com/avatar/2b73aa8a121a1adee2e4faba1e02939e8dbac3bc712cbcd793dce6f823f009c1?
s=60&d=retro&r=g)

### 󠀁[good to use](https://wordpress.org/support/topic/good-to-use-38/)󠁿

 [jhui123](https://profiles.wordpress.org/jhui123/) 2021年11月10日

Good to use

![](https://secure.gravatar.com/avatar/d26543d53e63b6bbcb23074e52bc7145d6e385a12f5cbc0701a9825190f3089f?
s=60&d=retro&r=g)

### 󠀁[Nice to use](https://wordpress.org/support/topic/nice-to-use-18/)󠁿

 [yifan99](https://profiles.wordpress.org/yifan99/) 2021年11月10日

User friendly. So easy to use

![](https://secure.gravatar.com/avatar/2e88ec2f50aad1664c4bd057d3b61100ddea0a434fa3fa857683317d15547a98?
s=60&d=retro&r=g)

### 󠀁[Easy to use.](https://wordpress.org/support/topic/easy-to-use-4097/)󠁿

 [huirulee14](https://profiles.wordpress.org/huirulee14/) 2021年11月10日

My website has a lot of unused CSS, by using this CSS optimizer. Mine CSS size decreased
around 90%. Users-Friendly with a good design.

![](https://secure.gravatar.com/avatar/23045853b890f160986d03b3a099e6d0cc590d15c341690a6595c7c1c7885d18?
s=60&d=retro&r=g)

### 󠀁[Reduce Unused CSS works like a charm!](https://wordpress.org/support/topic/reduce-unused-css-works-like-a-charm/)󠁿

 [phewlau](https://profiles.wordpress.org/phewlau/) 2021年11月10日

This plugin has drastically helped my site! Before using the plugin, Google’s PageSpeed
Insights keeps flagging my site with “Reduce Unused CSS” and “Eliminate render-blocking
resources”. What more can you ask for a free plugin?

 [ 6件のレビューをすべて表示 ](https://wordpress.org/support/plugin/css-optimizer-remove-unused-css/reviews/)

## 貢献者と開発者

CSS Optimizer – Remove Unused CSS はオープンソースソフトウェアです。以下の人々が
このプラグインに貢献しています。

貢献者

 *   [ wooncherk ](https://profiles.wordpress.org/wooncherk/)

[“CSS Optimizer – Remove Unused CSS” をあなたの言語に翻訳しましょう。](https://translate.wordpress.org/projects/wp-plugins/css-optimizer-remove-unused-css)

### 開発に興味がありますか ?

[コードを閲覧](https://plugins.trac.wordpress.org/browser/css-optimizer-remove-unused-css/)
するか、[SVN リポジトリ](https://plugins.svn.wordpress.org/css-optimizer-remove-unused-css/)
をチェックするか、[開発ログ](https://plugins.trac.wordpress.org/log/css-optimizer-remove-unused-css/)
を [RSS](https://plugins.trac.wordpress.org/log/css-optimizer-remove-unused-css/?limit=100&mode=stop_on_copy&format=rss)
で購読してみてください。

## 変更履歴

#### 1.7

 * Integrates with W3 Total Cache
 * Fix bug in job queue handling
 * Add warning in case of high amount of failed API calls

#### 1.6

 * Integrates with WP-Optimize
 * Fix bug where relative path is being incorrectly processed
 * Fix compatibiliy issue with Autopimize
 * Improve admin dashboard notification
 * Add FAQ section

#### 1.5

 * Integrats with SG Optimizer.
 * Improved compatibility.
 * Minor bug fixes

#### 1.4

 * Integrates with WP Fastest Cache and WP Rocket. More integration coming soon!
 * Improvements in the general workflow.
 * Minor bug fixes.

#### 1.3

 * Remove dependency on Auoptimize. The plugin can now work with or without Autoptimize.

#### 1.2

 * Add Job Queue for easier management.

#### 1.1

 * Add support for generating Critical CSS.

#### 1.0

 * First version. More updates coming soon!

## メタ

 *  バージョン **1.7**
 *  最終更新日 **4年前**
 *  有効インストール数 **100+**
 *  WordPress バージョン ** 4.7またはそれ以降 **
 *  検証済み最新バージョン: **5.9.13**
 *  PHP バージョン ** 5.1またはそれ以降 **
 *  言語
 * [English (US)](https://wordpress.org/plugins/css-optimizer-remove-unused-css/)
 * タグ
 * [autoptimize](https://ja.wordpress.org/plugins/tags/autoptimize/)[Critical CSS](https://ja.wordpress.org/plugins/tags/critical-css/)
   [css](https://ja.wordpress.org/plugins/tags/css/)[speed](https://ja.wordpress.org/plugins/tags/speed/)
 *  [詳細を表示](https://ja.wordpress.org/plugins/css-optimizer-remove-unused-css/advanced/)

## 評価

 5つ星中3.7つ星

 *  [  4 5-星レビュー     ](https://wordpress.org/support/plugin/css-optimizer-remove-unused-css/reviews/?filter=5)
 *  [  0 4-星レビュー     ](https://wordpress.org/support/plugin/css-optimizer-remove-unused-css/reviews/?filter=4)
 *  [  0 3-星レビュー     ](https://wordpress.org/support/plugin/css-optimizer-remove-unused-css/reviews/?filter=3)
 *  [  0 2-星レビュー     ](https://wordpress.org/support/plugin/css-optimizer-remove-unused-css/reviews/?filter=2)
 *  [  2 1-星レビュー     ](https://wordpress.org/support/plugin/css-optimizer-remove-unused-css/reviews/?filter=1)

[Your review](https://wordpress.org/support/plugin/css-optimizer-remove-unused-css/reviews/#new-post)

[すべてのレビューを見る](https://wordpress.org/support/plugin/css-optimizer-remove-unused-css/reviews/)

## 貢献者

 *   [ wooncherk ](https://profiles.wordpress.org/wooncherk/)

## サポート

意見や質問がありますか ?

 [サポートフォーラムを表示](https://wordpress.org/support/plugin/css-optimizer-remove-unused-css/)

## 寄付

このプラグインが今後も改善できるよう応援しませんか ?

 [ このプラグインに寄付 ](https://zippisite.com/)