Comprehensive image optimization with WebP, AVIF, Lazy Load, and more. Optimize images automatically for Faste...
Free
1M+ installs 4.8★ (1,838)
Images to WebP
Convert PNG, JPG and GIF images to WebP and speed up your web
The facts
- Rating
- 4.4★ from 32
- Active installs
- 10k+
- Price
- Free
- Last updated
- 16 Mar 2026
- Added
- Nov 2019
- Requires WP
- 5.0
- Tested up to
- WP 6.9.7
- Requires PHP
- 7.0
- Downloads
- 145,988
Our analysis
AI-assistedImages to WebP is a WordPress plugin that converts PNG, JPG, and GIF images to the WebP format, which can reduce page weight significantly without compromising image quality. It automates the conversion process on image upload and allows for bulk conversion of existing images, making it suitable for users looking to improve website performance and reduce bandwidth usage.
The plugin works with all types of WordPress installations, including multisite setups, and is compatible with both Apache and NGiNX servers. It does not alter original image files, ensuring that your existing content remains intact while providing options for developers to customise its functionality.
Best for: This plugin is best for website owners and developers looking to optimise image loading speeds.
What it does well
- ✓Converts images to WebP format to reduce page weight
- ✓Automated conversion on image upload
- ✓Bulk conversion of existing images
- ✓Compatible with various server types
- ✓Original files remain untouched
Where it falls short
- •Limited information on specific settings or user interface
- •No detailed performance metrics provided
Verdict
Images to WebP offers a practical solution for image optimisation, particularly for those focused on enhancing site performance without altering original files.
From the developer
kubiq's own description of Images to WebP, lightly tidied.
Statistics say that WebP format can save over a half of the page weight without losing images quality.
Convert PNG, JPG and GIF images to WebP and speed up your web, save visitors download data, make your Google ranking better.
- automated test after plugin activation to make sure it will work on your server
- works with all types of WordPress installations: domain, subdomain, subdirectory, multisite/network
- works on Apache and NGiNX
- image URL will be not changed so it works everywhere, in
src, srcset, <picture>, even in CSS backgrounds and there is no problem with cache - original files will be not touched
- set quality of converted images
- auto convert on upload
- only convert image if WebP filesize is lower than original image filesize
- bulk convert existing images to WebP ( you can choose folders )
- bulk convert only missing images
- works with `Fly Dynamic Image Resizer` plugin
Hooks for developers
itw_sizes
Maybe you want to disable WebP for thumbnails
add_filter( 'itw_sizes', 'disable_itw_sizes', 10, 2 );
function disable_itw_sizes( $sizes, $attachmentId ){
unset( $sizes['thumbnail'] );
return $sizes;
}
itw_htaccess
Maybe you want to modify htaccess rules somehow
add_filter( 'itw_htaccess', 'modify_itw_htaccess', 10, 2 );
function modify_itw_htaccess( $rewrite_rules ){
// do some magic here
return $rewrite_rules;
}
itw_abspath
Maybe you use roots.io/bedrock or other custom folder structure
add_filter( 'itw_abspath', 'modify_itw_abspath', 10, 2 );
function modify_itw_abspath( $abspath ){
return trailingslashit( WP_CONTENT_DIR );
}
$images_to_webp->convert_image()
Maybe you want to automatically generate WebP for other plugins
add_action( 'XXPLUGIN_image_created', 'XX_images_to_webp', 10, 2 );
function XX_images_to_webp( $image_path ){
global $images_to_webp;
$images_to_webp->convert_image( $image_path );
}
Tagged as
audience
Developers
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