By catch on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
10.3.x
Introduced in version: 
10.3.0
Issue links: 
https://www.drupal.org/node/3406267
Description: 

All core shipped image styles now include a conversion to webp as the final step. This should reduce download sizes for user-uploaded files when sites use the shipped image styles.

Sites can already configure custom image styles to include a webp conversion step.

Impacts: 
Site builders, administrators, editors
Module developers
Site templates, recipes and distribution developers