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Useful Constants for the EWWW Image Optimizer Plugin

EWWW Image Optimizer - Constants

The EWWW Image Optimizer plugin is a commonly used plugin and service for optimizing images on your WordPress website. The plugin includes a large number of constants that can be defined in your site’s wp-config.php file.

EWWW Image Optimizer Plugin

EWWW Image Optimizer

If you want to enable the native lazy loading in the EWWW Image Optimizer plugin, then you can use this constant;

define( 'EIO_ENABLE_NATIVE_LAZY', true );

To disable the lazy loader auto-scaler, you can use this constant;

define( 'EIO_LL_AUTOSCALE', false );

To load the lazysizes.js file in the header rather than the footer, then use this constant;

define( 'EIO_LL_FOOTER', false );

To disable the check for JPG to PNG image conversion, then use this constant;


To preserve metadata and stop it from being removed during image optimization of images then, use this constant;


WordPress in version 4.5 decreased the JPG image quality from 90 to 82. To define a specific image quality level for JPG images when image optimized, then set this constant and adjust as needed;


MainWP has a solid and easy-to-use “Code Snippets” extension for saving and executing code snippets on all your connected Child Sites.

Knowing all the constants that the EWWW Image Optimizer plugin supports will make it easy to understand how to disable and enable specific features within the plugin.

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Donata Stroink-Skillrud
Donata Stroink-Skillrud
President of Agency Attorneys