Title: Avif Express
Author: Pijush Gupta
Published: <strong>2023年1月17日</strong>
Last modified: 2025年10月5日

---

プラグインを検索

![](https://ps.w.org/avif-express/assets/banner-772x250.png?rev=2849582)

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/avif-express/assets/icon-256x256.png?rev=2849582)

# Avif Express

 作者: [Pijush Gupta](https://profiles.wordpress.org/pijush_gupta/)

[ダウンロード](https://downloads.wordpress.org/plugin/avif-express.2025.08.29.zip)

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

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

## 説明

On upload, images like jpg, png and WebP gets converted to avif format. Converted
images get served on web pages.

#### Feature list

 * Images get converted on upload.
 * Bulk convert previously uploaded images.
 * Schedule Bulk convert in the background.
 * Bulk convert theme images.
 * Local Conversion
 * Cloud Conversion (Freemium)
 * Serve Webpage with altered avif images.
 * Fully CDN compatible.
 * Backward compatibility – Browsers that don’t support Avif images will get Original
   images served on-the-fly.
 * Native Language Support for German, Spanish, Russian, French, Hindi and Bengali.

#### Official documentation of Avif Express

For a more detailed description of options and features of Avif Express, please 
read the [official documentation](https://github.com/Pijushgupta/avif-express).

## スクリーンショット

[⌊Setting Page⌉⌊Setting Page⌉[

Setting Page

## インストール

 1. Download and Unzip the file.
 2. Upload the plugin into the `wp-content/plugins/` directory of your WordPress site.
 3. Activate `Avif Express` from plugin page.

## FAQ

### documentation

Quick documentation [Avif express documentation](https://github.com/Pijushgupta/avif-express)

### How to obtain API key

You can obtain API key from [Avif Express API](https://rapidapi.com/aavoya-aavoya-default/api/avif-express)–
discontinued.

### How to generate avif images from previously uploaded images

Go to “Avif Express” on the left sidebar menu > On the “Avif express” page > Click
on the generate button on “Upload directory” row.

### How to generate avif images from theme’s image

Go to “Avif Express” on left sidebar menu > On the “Avif express” page > Click on
the generate button on “Theme directory” row.

### How to replace web-page’s images with avif images

Go to “Avif Express” on left sidebar menu > On the “Avif express” page > Select 
the mode from the dropdown on “Rendering” row.

## 評価

![](https://secure.gravatar.com/avatar/587bee003d770136c123517537ab0709a7f35acd95aae4bbe962f86228617919?
s=60&d=retro&r=g)

### 󠀁[Good plugin](https://wordpress.org/support/topic/good-plugin-7254/)󠁿

 [Pavel](https://profiles.wordpress.org/wishlight/) 2025年12月11日

Works great with WebP. My GD doesn't support Avif properly. Works with Nginx.

![](https://secure.gravatar.com/avatar/1d7de348e9e1f716993394b5fb6ef2c1e0361aa2bd114436240f52e158dfe96a?
s=60&d=retro&r=g)

### 󠀁[Works as advertised](https://wordpress.org/support/topic/works-as-advertised-923/)󠁿

 [dogma00](https://profiles.wordpress.org/dogma00/) 2025年10月12日

Took a while to realise that you have to turn the rendering on first, though. 😀
Hardly the developer's fault. But you might want to make that particular setting
a tad bigger maybe? I especially appreciate the possibility for local conversion.
Personally I have no need for the cloud option. EDIT: Unfortunately it doesn't work
with a static site generator – at least not with Staatic. Possibly related to the
fact that it also doesn't show avif images if you're logged in as an admin. Most
of the time this shouldn't be an issue, though.

![](https://secure.gravatar.com/avatar/bb25aa0f3a1217c87f6d8a2c2a48049fee476b8735437a8488490173230a59b9?
s=60&d=retro&r=g)

### 󠀁[Amazing Plugin](https://wordpress.org/support/topic/amazing-plugin-2785/)󠁿

 [kjcomparaz](https://profiles.wordpress.org/kjcomparaz/) 2025年7月18日

I do recommend this plugin, it does what it offer

![](https://secure.gravatar.com/avatar/487b5bc7250732e3dc2bd2ca4ac9ea3e5890f9af42e6d11ef87b74172503edeb?
s=60&d=retro&r=g)

### 󠀁[Good plugin](https://wordpress.org/support/topic/update-any-soon/)󠁿

 [js1200](https://profiles.wordpress.org/js1200/) 2025年12月19日

Very good plugin overall however I've got small issue with .png image in the logo
of my website. This image is transparent so the plugin converts it to .avif format
and transparency is not preserved. Is this bug?

![](https://secure.gravatar.com/avatar/5e765e4f2237141a267cab2889e99aa69ede0226f1707c146bdb24fe4f11b8a4?
s=60&d=retro&r=g)

### 󠀁[Works fine](https://wordpress.org/support/topic/works-fine-1579/)󠁿

 [Troglos](https://profiles.wordpress.org/troglos/) 2024年5月31日

It works pretty fine. Needs some little improvement but overall it works ok.

![](https://secure.gravatar.com/avatar/4c485a16524f42bc4f2f4f13b4f0dc22ee6a42fe669182a6ecdd8d7a1ab96a49?
s=60&d=retro&r=g)

### 󠀁[Ajax error; internal 500](https://wordpress.org/support/topic/ajax-error-internal-500/)󠁿

 [Hendrik57](https://profiles.wordpress.org/hendrik57/) 2024年3月30日

The plugin did nothing. I got an ajax error: POST mysite.nl/wp-admin/admin-ajax.
php 500 (Internal Server Error)

 [ 9件のレビューをすべて表示 ](https://wordpress.org/support/plugin/avif-express/reviews/)

## 貢献者と開発者

Avif Express 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

 *   [ Pijush Gupta ](https://profiles.wordpress.org/pijush_gupta/)

“Avif Express” は2ロケールに翻訳されています。 [翻訳者](https://translate.wordpress.org/projects/wp-plugins/avif-express/contributors)
のみなさん、翻訳へのご協力ありがとうございます。

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

### 開発に興味がありますか ?

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

## 変更履歴

#### 29.08.2025

 1. Background Image processing
 2. Background Image Scanning for Image processing
 3. Image Lazy loading – Native, JavaScript, Background Lazy loading
 4. Bug fix: – false negative condition for local image conversion. [Issue](https://github.com/Pijushgupta/avif-express/issues/24)
    by [David Degner](https://github.com/ddegner).

#### 01.12.05.2025

1.Improved background replacement logic.
 2.Added image lazy-loading feature. 3.
Bug fix: Fixed image replacement logic for images outside the upload directory.

#### 02.08.2024

 1. Fixed background image replacement bug.
 2. Fixed Imagick version checking bug.
 3. Added file system permission check before writing.
 4. Enabled cloud conversion from localhost.

#### 01.20.06.2024

 1. Removed aviflog(wrapper of monolog), due to php version issue.

#### 19.06.2024

 1. Added cloud conversion for ease of use in case the server doesn’t support AVIF 
    conversion.
 2. Added an option for a fallback image type (WebP/original) for older browsers/webviews.
 3. Added a cookie to notify the server whether to catch pages for browsers that don’t
    support AVIF. (Cookies: browser_avif_support_true, browser_avif_support_false)
 4. Implemented a logging system.
 5. Added system information to display local server capabilities to the end user.
 6. Added on-the-fly AVIF conversion if the server supports it.

#### 28.06.2023

Feature:
 1. Externally added webp images can be served via this plugin on browser
that does not support avif image. note: Image fix name should be same as source.
Bugfix 1. If server is capable of generating webp and not avif, then this plugin
will generate and serve webp images. In case server is not capable of generating
webp and avif both, original image will get served in case no externally added webp
image found. 2. Other small bug fixes.

#### 02.05.11.2023

Bugfix: Image Magic class checking.

#### 05.11.2023

Bugfix: Skipping SVG processing on rendering. Checking server capability to convert
Avif even when rendering is off.

#### 05.07.2023

Backward compatibility – Browsers that don’t support Avif images will get WebP images
served on the fly.
 Bugfix: Images that don’t belongs to the same domain no logger
getting skipped.

#### 03.20.2023

Added translation for German, Spanish, Russian, French, Hindi and Bengali, for backend
Admin dash.

#### 02.27.2023

Issue: Undefined Constant. Fixed. Pointed by [argument](https://wordpress.org/support/
users/argument/,”Bug finder”).

#### 02.26.2023

ImageMagick version checking. Version ‘7.0.25’ or above required.
 Issue: Auto convert
on upload was not working. Fixed : Typo in namespace.

#### 02.25.2023

Issue: php 8.1 or 8.2 with GD with libavif support still creating 0 byte avif images.#
Php_bug. Fixed with Imagick library.

#### 02.23.2023

Issue: Migrated images with post type of attachment were not getting converted. 
Fixed.
 Issue: php 8.1 or 8.2 with GD with libavif support still creating 0 byte
avif images. Not fixed. #Php_bug

#### 01.30.2023

Conflict with Autoptimize plugin fixed.

#### 01.20.2023

Lowered the “Requires at least” wordpress version.
 Updated Description on README.
txt. Code commenting. Added php version checking, require at least 8.1, since imageavif()
method only comes with php8.1 or later. Added method checking for imageavif(), it
prevent ajax error in case Php GD not having libavif. libavif is library required
by GD to convert image to avif image. Note: latest Plesk Obsidian(Version 18.0.49)
with php 8.2 do not provide libavif to GD. No way around.

#### 01.19.2023

Updated FAQ section on README.txt.
 Added Additional file checking on frontend. 
If .avif file exist then only alter the image url.

## メタ

 *  バージョン **2025.08.29**
 *  最終更新日 **1年前**
 *  有効インストール数 **300+**
 *  WordPress バージョン ** 6.0またはそれ以降 **
 *  検証済み最新バージョン: **6.8.11**
 *  PHP バージョン ** 7.3またはそれ以降 **
 *  言語
 * [English (US)](https://wordpress.org/plugins/avif-express/)、[Spanish (Chile)](https://cl.wordpress.org/plugins/avif-express/)、
   [Spanish (Spain)](https://es.wordpress.org/plugins/avif-express/).
 *  [プラグインを翻訳](https://translate.wordpress.org/projects/wp-plugins/avif-express)
 * タグ
 * [AVIF](https://ja.wordpress.org/plugins/tags/avif/)[images](https://ja.wordpress.org/plugins/tags/images/)
   [performance](https://ja.wordpress.org/plugins/tags/performance/)
 *  [詳細を表示](https://ja.wordpress.org/plugins/avif-express/advanced/)

## 評価

 5つ星中3.8つ星

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

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

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

## 貢献者

 *   [ Pijush Gupta ](https://profiles.wordpress.org/pijush_gupta/)

## 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/avif-express/)