Title: Only WebP Uploads
Author: rbonfil
Published: <strong>2026年1月9日</strong>
Last modified: 2026年1月10日

---

プラグインを検索

![](https://ps.w.org/only-webp-uploads/assets/banner-772x250.png?rev=3435586)

![](https://ps.w.org/only-webp-uploads/assets/icon-256x256.png?rev=3435586)

# Only WebP Uploads

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

[ダウンロード](https://downloads.wordpress.org/plugin/only-webp-uploads.1.0.1.zip)

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

 [サポート](https://wordpress.org/support/plugin/only-webp-uploads/)

## 説明

Only WebP Uploads automatically converts your image uploads (JPG, PNG, GIF) to WebP
format. It handles all image sizes generated by WordPress, ensuring your site serves
optimized, modern image formats.

Features:
 * **Automatic Conversion:** Converts images immediately upon upload. ***
Space Saving:** Replaces original files with lighter WebP versions. * **Database
Integration:** Updates WordPress metadata so the Media Library recognizes the file
as WebP. * **Bulk Conversion:** Includes a tool to scan and convert existing images
in your library. * **WP-CLI Support:** Manage conversions via command line using`
wp onlywebp`. * **Smart Filename Sanitization:** Automatically cleans filenames (
e.g., `mañana.jpg` -> `manana.webp`). For non-Latin names (e.g., Japanese), it generates
a secure unique ID to ensure compatibility. * **Security:** Checks for Imagick support
and sanitizes filenames.

## スクリーンショット

 * [[
 * General Settings / Plugin Configuration.
 * [[
 * Bulk Optimization Tool / Media Library view.

## インストール

 1. Upload the plugin files to the `/wp-content/plugins/only-webp-uploads` directory,
    or install the plugin through the WordPress plugins screen directly.
 2. Activate the plugin through the ‘Plugins’ screen in WordPress.
 3. Use the Settings->Only WebP Uploads screen to configure your preferences.

## FAQ

### Does this modify my original images?

Yes, this plugin is designed to **replace** your original uploads with WebP versions
to save storage space.

### Requirements?

You need the PHP `Imagick` extension installed and enabled on your server, with 
WebP support.

## 評価

このプラグインにはレビューがありません。

## 貢献者と開発者

Only WebP Uploads 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

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

[“Only WebP Uploads” をあなたの言語に翻訳しましょう。](https://translate.wordpress.org/projects/wp-plugins/only-webp-uploads)

### 開発に興味がありますか ?

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

## 変更履歴

#### 1.0.1

 * New: Added “Strict Filename Sanitization” toggle.
 * New: Rewritten UI with toggle switches and quality slider.
 * Fix: Prevent file overwrite when uploading files with the same name.

#### 1.0.0

 * Initial launch on WordPress.org

#### 0.4.1

 * Fix: Resolved issues reported by WordPress Plugin Review Team.
 * Fix: Properly enqueued admin scripts and styles.
 * Fix: Scoped sanitization filter to upload process only.
 * Fix: Corrected Text Domain to match plugin slug.

#### 0.4

 * Production release

= 0.3.9 (RC)=
 * Fix: Translation corrections. * New: Added “Credits tab”.

= 0.3.8 (BETA)=
 * Security: Improved output escaping in admin dashboard. * Compliance:
Standardized readme.txt and headers.

#### 0.3.7 (BETA)

 * Refactor: Renamed internal references from `wua` to `onlywebp`.
 * Fix: Resolved text domain mismatch issues.
 * Security: Added warnings for bulk content replacement.

#### 0.3.6 (BETA)

 * Fix: Resolved duplicated image issues.

#### 0.3.5 (BETA)

 * Initial release.

#### 0.2.0 (ALFA)

 * Base structure.

= 0.1.0 (PRE-ALFA)=
 * Idea and concept.

## メタ

 *  バージョン **1.0.1**
 *  最終更新日 **5か月前**
 *  有効インストール数 **20+**
 *  WordPress バージョン ** 5.8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/only-webp-uploads/)
 * タグ
 * [conversion](https://ja.wordpress.org/plugins/tags/conversion/)[images](https://ja.wordpress.org/plugins/tags/images/)
   [optimization](https://ja.wordpress.org/plugins/tags/optimization/)[upload](https://ja.wordpress.org/plugins/tags/upload/)
   [webp](https://ja.wordpress.org/plugins/tags/webp/)
 *  [詳細を表示](https://ja.wordpress.org/plugins/only-webp-uploads/advanced/)

## 評価

レビューはまだ送信されていません。

[Your review](https://wordpress.org/support/plugin/only-webp-uploads/reviews/#new-post)

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

## 貢献者

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

## 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/only-webp-uploads/)