WordPress 7.1 ships client-side media processing – a capability that handles image compression, resizing, format conversion, rotation, and thumbnail generation directly in the user’s browser using WebAssembly, rather than on the server. The feature is enabled by default in supporting browsers.
This post outlines what’s changing, how it works, and what plugin and theme developers need to know.
What is client-side media processing?
Traditionally, when a user uploads an image in the block editor, the file is sent to the server where PHP (using GD or Imagick) generates thumbnails (various image sizes for the front end), applies format conversions, handles
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