Avif Express

by Pijush Gupta

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Description

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.

Installation

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

Screenshots

Setting Page

Faq

documentation

Quick documentation Avif express documentation

How to obtain API key

You can obtain API key from Avif Express API – 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.

Reviews

Works as advertised

By dogma00 on October 12, 2025

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.

Amazing Plugin

By kjcomparaz on July 18, 2025

I do recommend this plugin, it does what it offer

Good plugin

By js1200 on November 19, 2025

Does it work with newest wordpress? Seems that it converts uploaded images but some images are still displayed in jpg format. Bug?

Update: it works and it serves avif and webp images but when I'm not logged in on my website. After signing in it displays images in jpg format

Works fine

By Troglos on May 31, 2024

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

Ajax error; internal 500

By Hendrik57 on March 30, 2024

The plugin did nothing. I got an ajax error:

POST mysite.nl/wp-admin/admin-ajax.php 500 (Internal Server Error)

Best plugin

By roboxkin on October 23, 2023

Thank you very much for the plugin, this is exactly what I was looking for for so long

crasht my site!

By liveatletico2 on May 11, 2023

I must backup now pfff

It works.

By wpluginbr on May 10, 2023

It converted the images well, but it breaks the images that are in SVG. If you can fix that, it'll be perfect.

Changelog

29.08.2025

Background Image processing
Background Image Scanning for Image processing
Image Lazy loading – Native, JavaScript, Background Lazy loading
Bug fix: – false negative condition for local image conversion. Issue by David Degner.

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

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

01.20.06.2024

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

19.06.2024

Added cloud conversion for ease of use in case the server doesn’t support AVIF conversion.
Added an option for a fallback image type (WebP/original) for older browsers/webviews.
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)
Implemented a logging system.
Added system information to display local server capabilities to the end user.
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.