WordPress generates responsive images automatically, but most sites have gaps in compression, sizing, or retina support. Here's how it works.

WP Mayor

WordPress has supported responsive images since version 4.4, automatically generating multiple size variants and adding srcset/sizes attributes to img tags. However, the default setup has notable gaps: themes must properly support srcset, the sizes attribute may not reflect actual layout widths, retina/high-DPI displays need 2x variants WordPress doesn't generate, and no compression is applied to size variants. The post explains how srcset and sizes work together, covers edge cases like browser inconsistencies and layout shift prevention via width/height attributes, and recommends plugins like Perfect Images for retina support and ShortPixel for compression and adaptive image serving based on real container dimensions.

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