Empirical Responsive Images is a WordPress plugin that observes real visitor page layouts to learn which image sizes are actually needed. It then automatically generates those specific thumbnails in the background along with modern formats like WebP and AVIF when supported by the server. This improves Core Web Vitals and PageSpeed scores by serving correctly sized images without relying on predefined breakpoints or theme guesses. It works on any theme and requires no configuration.
In the Compression & format conversion space, Empirical Responsive Images takes a focused approach. It focuses on delivering properly sized images to each visitor's device without manual configuration or guesswork for image sizes. It is built as a B2B product for wordPress site owners and developers. Empirical Responsive Images is free to use. Empirical Responsive Images is available on the web, and it can be self-hosted.
Jesus Iniesta builds and maintains Empirical Responsive Images, and it first shipped in 2026. Among its 5 catalogued features are Responsive Images, Auto Thumbnail Generation, and WebP Support.
Summary written by a language model from the project’s public pages.
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