Speed up your website by using our WebP & AVIF Converter. Optimize images and serve WebP and AVIF images instead of standard formats!
Speed up your website using our ease image optimizer by serving WebP and AVIF images. By replacing files in standard JPEG, PNG and GIF formats with WebP and AVIF formats, you can save over a half of the page weight without losing quality.
After installing the plugin you do not have to do anything more. Your current images will be converted into a new format. When image optimization by our image optimizer is finished, users will automatically receive new, much lighter images than the original ones.
As of today, over 90% of users use browsers that support the WebP format. The loading time of your website depends to a large extent on its weight and the level of image optimization. Using our WebP Converter, now you can and speed up it in a few seconds without much effort!
This will be a profit both for your users who will not have to download so much data, but also for a server that will be less loaded. Remember that a better optimized website also affects your Google ranking. Image optimization is very important.
Now in the PRO version you can use AVIF as the output format for your images. The AVIF format is a new extension – is the successor to WebP. AVIF allows you to achieve even higher levels of image compression, and the quality of the converted images after image optimization is better than in WebP.
image/webp
.img
HTML tag or you use background-image
. It works always!Optimize images and raise your website to a new level now! Install the plugin and enjoy the website that loads faster by image optimization. Surely you and your users will appreciate it.
You can convert WebP and optimize images not only from /uploads
directory but also from /plugins
and /themes
directories. This allows full integration with the WebP format!
We spend hours working on the development of this plugin. Technical support also requires a lot of time, but we do it because we want to offer you the best plugin. We enjoy every new plugin installation.
If you would like to appreciate it, you can try the PRO version. In addition, you will gain access to extra functionalities that will allow you to achieve even better image optimization results.
/wp-content/plugins/webp-converter-for-media
directory, or install the plugin through the WordPress plugins screen directly.Plugins
screen in WordPress Admin Panel.Settings -> Settings -> Converter for Media
screen to configure the plugin.Start Bulk Optimization
button and wait.That’s all! Your website is already loading faster!
Before you add a new thread, read all other questions in this FAQ and other threads in the support forum first. Perhaps someone had a similar problem and it has been resolved.
When adding a thread, follow these steps and reply to each of them:
1. Do you have any errors on the plugin settings page? Please read this thread if you have any errors.
2. URL of your website.
3. Screenshot of the Help Center tab on the plugin settings screen – please take a screenshot of the ENTIRE page.
4. Please do the test, which is described in the FAQ in the question “How to check if the plugin works?”. Please send a screenshot of Devtools with the test results.
Please remember to include the answers to all questions by adding a thread. It is much easier and accelerates the solution of your problem.
If you are using a Nginx server that does not support .htaccess rules, additional Nginx server configuration is required for the plugin to work properly.
Please read this tutorial for more information.
If you are using a Nginx server that supports .htaccess rules, but you still have a server configuration error on the plugin settings page, additional Nginx server configuration is required for the plugin to work properly.
Please read this tutorial for more information.
If you have an error on the plugin settings screen, first of all, please read it carefully. They are displayed when there is a problem with the configuration of your server or website.
The messages are designed to reduce the number of support requests that are repeated. It saves your and our time. Please read this thread for more information.
You can get several types of errors when converting. First of all, carefully read their content. For the most part, you can solve this problem yourself. Try to do this or contact the server administrator.
If you get an error: File "%s" does not exist. Please check file path.
means that the file_exists() function in PHP returned false
using the file path given in the error message. Check this path and make sure it is correct.
If you get an error: File "%s" is unreadable. Please check file permissions.
means that the is_readable() function in PHP returned false
using the file path given in the error message. Check the permissions for the file and the directory in which the file is located.
If you get an error: "%s" is not a valid image file.
means that the file is damaged in some way. Download the file to disk, save it again using any graphics program and add it again to the page. If the error applies to individual images then you can ignore it – just the original images will load, not WebP.
If you get an error: Image "%s" converted to .webp is larger than original and converted .webp file has been deleted.
means the original image weighed less than WebP. This happens when images have been compressed before. Disable the “Automatic removal of files in output formats larger than original” option in plugin settings to force always using WebP.
Practically every hosting meets these requirements. You must use PHP at least 7.0 and have the GD
or Imagick
extension installed. The extension must support WebP format
. If you have an error saying that the GD or Imagick library is not installed, but you have it installed then they are probably incorrectly configured and do not have WebP support.
They are required native PHP extensions, used among others by WordPress to generate thumbnails. Your server must also have the modules mod_mime
, mod_rewrite
and mod_expires
enabled.
An example of the correct server configuration can be found here. The link to your current configuration can be found in the Help Center tab on plugin settings screen.
Note the items marked in red. If the values marked in red do not appear in your case, it means that your server does not meet the technical requirements. Pay attention to the WebP Support value for the GD library and WEBP in the list of supported extensions for the Imagick library.
In a situation where your server does not meet the technical requirements, please contact your server Administrator. We are not able to help you. Please do not contact us about this matter, because this is a server configuration problem, not a plugin.
Also, REST API must be enabled and work without additional restrictions. If you have a problem with it, please contact the Developer who created your website. He should easily find the issue with the REST API not working.
You can find more information on how the plugin works in our manual.
This is possible using the following types of filters to change default paths. It is a solution for advanced users. If you are not, please skip this question.
Path to the root installation directory of WordPress (ABSPATH
by default):
add_filter( 'webpc_site_root', function( $path ) { return ABSPATH; } );
Paths to directories (relative to the root directory):
add_filter( 'webpc_dir_name', function( $path, $directory ) { switch ( $directory ) { case 'uploads': return 'wp-content/uploads'; case 'webp': return 'wp-content/uploads-webpc'; case 'plugins': return 'wp-content/plugins'; case 'themes': return 'wp-content/themes'; } return $path; }, 10, 2 );
Note that the /uploads-webpc
directory must be at the same nesting level as the /uploads
, /plugins
and /themes
directories.
Prefix in URL of /wp-content/
directory or equivalent (used in .htaccess):
add_filter( 'webpc_htaccess_rewrite_path', function( $prefix ) { return '/'; } );
For the following sample custom WordPress structure:
... ├── web ... ├── app │ ├── mu-plugins │ ├── plugins │ ├── themes │ └── uploads ├── wp-config.php ...
Use the following filters:
add_filter( 'webpc_site_root', function( $path ) { return 'C:/WAMP/www/project/web'; // your valid path to root } ); add_filter( 'webpc_htaccess_rewrite_path', function( $prefix ) { return '/'; } ); add_filter( 'webpc_dir_name', function( $path, $directory ) { switch ( $directory ) { case 'uploads': return 'app/uploads'; case 'webp': return 'app/uploads-webpc'; case 'plugins': return 'app/plugins'; case 'themes': return 'app/themes'; } return $path; }, 10, 2 );
After setting the filters go to Settings -> Converter for Media
in the admin panel and click the Save Changes
button. .htaccess
files with appropriate rules should be created in the directories /uploads
and /uploads-webpc
.
To exclude selected directories, use the following filter:
add_filter( 'webpc_supported_source_directory', function( bool $status, string $directory_name, string $server_path ): bool { $excluded_directories = [ 'my-directory' ]; if ( in_array( $directory_name, $excluded_directories ) ) { return false; } return $status; }, 10, 3 );
To exclude selected files use the following filter (in this case with the suffix “-skipwebp” in a filename, e.g. image-skipwebp.png):
add_filter( 'webpc_supported_source_file', function( bool $status, string $file_name, string $server_path ): bool { $excluded_suffix = '-skipwebp'; if ( strpos( $file_name, $excluded_suffix . '.' ) !== false ) { return false; } return $status; }, 10, 3 );
Argument $server_path
is the absolute server path to a directory or file. Inside the filters, you can apply more complicated rules as needed.
Filters run before images are converted – they no longer support converted images. You have to delete them manually if they should not be converted.
The plugin supports the following directories by default:
– /gallery
– /plugins
– /themes
– /uploads
If you want to add support for a custom directory, add the following code to the functions.php file in your theme directory (use a correct directory name instead of custom-directory
):
add_filter( 'webpc_source_directories', function ( $directories ) { $directories[] = 'custom-directory'; return $directories; } );
Remember that this directory must be located in the /wp-content
directory.
By default, all images are converted when you click on the Start Bulk Optimization
button. In addition, conversion is automatic when you add new files to your Media Library.
Remember that our plugin takes into account images generated by WordPress. There are many plugins that generate, for example, images of a different size or in a different version.
If you would like to integrate with your plugin, which generates images by yourself, you can do it. Our plugin provides the possibility of this type of integration. This works for all images in the /wp-content
directory.
It is a solution for advanced users. If you would like to integrate with another plugin, it’s best to contact the author of that plugin and give him information about the actions available in our plugin. This will help you find a solution faster.
You can manually run converting selected files, you can use the action to which you will pass an array with a list of paths (they must be absolute server paths):
do_action( 'webpc_convert_paths', $paths, true );
An alternative method is to manually start converting the selected attachment by passing the post ID from the Media Library. Remember to run this action after registering all image sizes (i.e. after running the add_image_size
function):
do_action( 'webpc_convert_attachment', $post_id, true );
To delete manually converted files, use the following action, providing as an argument an array of absolute server paths to the files (this will delete manually converted files):
do_action( 'webpc_delete_paths', $paths );
The plugin supports WP-CLI, which enables faster image conversion from the server level. More information on how to get started with WP-CLI can be found in the Handbook. The supported commands are described below.
Checking how many maximum images for conversion are on website:
wp converter-for-media calculate
Converting all images:
wp converter-for-media regenerate
Converting all images (with “Force convert all images again” option):
wp converter-for-media regenerate --force
The website files (WordPress files) and the images from the Media Library must be on the same server. If they are, everything should work fine.
If only your images are on another CDN server, unfortunately correct operation is impossible, because such images are managed by another server.
Current list of supported CDN servers:
– BunnyCDN (refer to the instructions before use)
[Fixed]
Filter webpc_option_quality_levels
to change conversion quality levels[Added]
Support for WordPress 6.6[Fixed]
Modification of plugin settings via filters[Fixed]
Support for changed upload directory path based on absolute path from upload_path option[Fixed]
UX of plugin settings page[Changed]
Error message for rewrites_not_executed error in server configuration[Fixed]
Support for changed upload directory path based on upload_path option[Changed]
Verification of rewrites_not_executed server configuration error[Added]
Support for changed upload directory path based on upload_path option[Added]
Support for WordPress 6.5[Fixed]
Verification of rewrites_not_executed server configuration error when there is also a problem with the Gd or Imagick libraries[Changed]
Error message for bypassing_apache error in server configuration[Added]
Possibility to add directory paths in the Excluded directories field in Advanced Settings[Changed]
Statistics about bulk optimization process[Added]
Expert settings to overwrite paths for rewrite rules[Added]
Improvement in verifying operation of redirections[Added]
Compatibility with PHP 8.3[Changed]
Error message for rewrites_not_executed error in server configuration[Changed]
Error message for bypassing_apache error in server configuration[Fixed]
Removing WebP files converted for AVIF format from /uploads-webpc directory after uninstalling plugin[Fixed]
Statistics of conversion progress in WP-CLI[Changed]
Error message for rewrites_not_executed error in server configuration[Changed]
Error message for bypassing_apache error in server configuration[Changed]
Error message for rewrites_cached error in server configuration[Fixed]
Automatically conversion of images from /uploads directory, but not from Media Library[Added]
Support for WordPress 6.4[Added]
Button to expand/collapse list of directories to optimize in Bulk Optimization of Images section[Added]
Notification about plugin requirements in WordPress Playground environment[Fixed]
Duplicated rewrite rules for .jpeg files[Changed]
Error message for rewrites_not_executed error in server configuration[Added]
Ability to manually optimize selected images in Media Library[Added]
Ability to manually undo optimization of selected images in Media LibrarySee changelog.txt for previous versions.