Title: Mass Resizer
Author: Stan Furtovsky
Published: <strong>2024年12月30日</strong>
Last modified: 2025年12月10日

---

プラグインを検索

![](https://ps.w.org/mass-resizer/assets/banner-772x250.jpg?rev=3214913)

![](https://ps.w.org/mass-resizer/assets/icon-256x256.jpg?rev=3214945)

# Mass Resizer

 作者: [Stan Furtovsky](https://profiles.wordpress.org/konion/)

[ダウンロード](https://downloads.wordpress.org/plugin/mass-resizer.2.10.93.zip)

 * [詳細](https://ja.wordpress.org/plugins/mass-resizer/#description)
 * [レビュー](https://ja.wordpress.org/plugins/mass-resizer/#reviews)
 *  [インストール](https://ja.wordpress.org/plugins/mass-resizer/#installation)
 * [開発](https://ja.wordpress.org/plugins/mass-resizer/#developers)

 [サポート](https://wordpress.org/support/plugin/mass-resizer/)

## 説明

Mass Resizer is a lightweight but powerful plugin for bulk image optimization.
 
It resizes large images, converts them to WebP, replaces them across posts/pages,
and safely manages media files without risking broken content.

### Key Features

**Bulk Image Resize**
 • Automatically resizes images to a maximum width/height •
Maintains aspect ratio (no cropping, unless enabled) • Skips small images to reduce
unnecessary processing

**Safe WebP Conversion**
 • Converts JPEG/PNG to modern WebP format • Inherits original
image metadata (alt, caption, description) • Creates proper attachment entries with
parent relations • Preserves titles and SEO attributes

**Safe Replace Mode**
 • Replaces all occurrences of images in posts and pages •
Updates featured images as well • Multiple registered sizes are replaced (full +
intermediate sizes)

**Safe Delete Mode**
 To prevent content breakage, original images are deleted **
only when both conditions are met**: 1. Replace Old Images = enabled 2. Crop = disabled
If delete was requested in unsafe configuration, the plugin logs a warning and ignores
the deletion.

**Admin Statistics + Logs**
 After each run, the plugin displays a detailed summary:•
Images cropped • Images converted to WebP • Pages updated • Originals deleted • 
Total completed operations

All warnings (missing files, unsupported types, editor errors) are logged and shown
to the administrator.

**Automatic Server Capability Detection**
 The plugin checks whether your server
supports: • JPEG editing • WebP conversion

Unsupported features are automatically disabled with an explanation.

**Fully Internationalized (i18n)**
 All dynamic strings include translator comments,
following WordPress.org standards.

## スクリーンショット

 * [[
 * Mass Resizer settings page.

## インストール

 1. Upload the `mass-resizer` folder to `/wp-content/plugins/`.
 2. Activate the plugin via **Plugins  Installed Plugins**.
 3. Open **Mass Resizer** in the WordPress dashboard and configure your desired options.
 4. Use the Media Library bulk actions to process selected images.

## FAQ

### Does the plugin delete my original images?

Only when both features are enabled:
 • “Replace old images” • “Delete original 
images” Otherwise, deletion is blocked to prevent broken pages.

### Will my SEO metadata be preserved?

Yes. WebP attachments automatically inherit:
 • alt text • caption • description•
parent relation • date fields

### Does Mass Resizer modify existing posts?

If “Replace old images” is enabled, the plugin updates posts/pages that contain 
the converted images.
 Otherwise, no post content is changed.

### Can I use it on a large site?

Yes. The plugin is optimized to handle large numbers of images, and includes safety
checks, capability detection, and detailed logging.

## 評価

![](https://secure.gravatar.com/avatar/dfc12d1181f434f4a4c5589b5cd0a03cf5d2a99bd4b353e4278497b6bdd9a573?
s=60&d=retro&r=g)

### 󠀁[Best plugin ever](https://wordpress.org/support/topic/best-plugin-ever-507/)󠁿

 [bimbozvon](https://profiles.wordpress.org/bimbozvon/) 2025年3月5日

Thanks to the developer, I’ve been looking for a planner with this kind of functionality
and ease of use for a long time!

 [ 1件のレビューをすべて表示 ](https://wordpress.org/support/plugin/mass-resizer/reviews/)

## 貢献者と開発者

Mass Resizer 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

 *   [ Stan Furtovsky ](https://profiles.wordpress.org/konion/)

“Mass Resizer” は1ロケールに翻訳されています。 [翻訳者](https://translate.wordpress.org/projects/wp-plugins/mass-resizer/contributors)
のみなさん、翻訳へのご協力ありがとうございます。

[“Mass Resizer” をあなたの言語に翻訳しましょう。](https://translate.wordpress.org/projects/wp-plugins/mass-resizer)

### 開発に興味がありますか ?

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

## 変更履歴

#### 2.10.93 (10.12.2025)

 * **Security & safety**
    – Added strict sanitization for all numeric options. –
   Added hard upper limit for image dimensions. – Improved safe-delete logic (deletes
   originals only when safe).
 * **Stability & UX**
    – Added detailed admin report with full statistics after 
   processing. – Improved error logging (missing files, unsupported types, editor
   failures). – Implemented automatic image/WebP capability detection with clear
   notices.
 * **Compatibility**
    – Improved i18n: translators comments added for all placeholder
   strings. – Code refined to meet WordPress.org standards. – WebP attachments now
   inherit alt text, caption, and description from the original image.

#### 2.9.207 (29.12.2024)

 * Security improvements and minor fixes.

#### 2.9.201 (11.11.2024)

 * Added support for replacing featured images.
 * General optimization and bug fixes.

#### 2.9.200 (10.11.2024)

 * Added multilingual interface (RU/EN).
 * Introduced logging system with admin notices.
 * UI improvements and better compatibility with WordPress themes.

## メタ

 *  バージョン **2.10.93**
 *  最終更新日 **6か月前**
 *  有効インストール数 **30+**
 *  WordPress バージョン ** 5.0またはそれ以降 **
 *  検証済み最新バージョン: **6.9.4**
 *  PHP バージョン ** 7.4またはそれ以降 **
 *  言語
 * [English (US)](https://wordpress.org/plugins/mass-resizer/)、[Russian](https://ru.wordpress.org/plugins/mass-resizer/).
 *  [プラグインを翻訳](https://translate.wordpress.org/projects/wp-plugins/mass-resizer)
 * タグ
 * [image compression](https://ja.wordpress.org/plugins/tags/image-compression/)
   [image resize](https://ja.wordpress.org/plugins/tags/image-resize/)[media](https://ja.wordpress.org/plugins/tags/media/)
   [webp](https://ja.wordpress.org/plugins/tags/webp/)
 *  [詳細を表示](https://ja.wordpress.org/plugins/mass-resizer/advanced/)

## 評価

 5つ星中5つ星

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

[Your review](https://wordpress.org/support/plugin/mass-resizer/reviews/#new-post)

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

## 貢献者

 *   [ Stan Furtovsky ](https://profiles.wordpress.org/konion/)

## 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/mass-resizer/)