YouTube is testing dynamic thumbnail and video sizes on mobile, breaking away from the usual uniform grid on the Home feed.
The feature is rolling out to both Android and iOS as part of a limited experiment.
Thumbnails may look cropped, but YouTube says it isn’t altering original uploads.
YouTube is about to look different on your phone. After trying out larger video thumbnails on desktop in early 2025, YouTube is now testing a feature that automatically changes the size of videos and thumbnails on the mobile Home feed.
YouTube shared on its support page that this test is now rolling out to both Android and iOS users. The main goal is to make the screen feel more immersive. Since space on mobile screens is limited, YouTube wants to help videos stand out as you scroll.
