Samsung Galaxy S25: Screen Size & CSS Viewport

The Samsung Galaxy S25 is the most compact phone in the S25 family, and its CSS viewport of 360×780 is one of the narrowest among modern flagships. The 360px width is the standard Samsung Galaxy design target — the viewport referenced in Samsung's own developer documentation and the width that Android-first designers optimize for when targeting Samsung's user base.

If you are already testing at 390px for iPhone you may be tempted to skip 360px. Do not. The 30-pixel difference in viewport width is enough to cause text truncation in headers, grid items wrapping to extra rows, and inline elements colliding in ways that do not appear at 390px. Samsung accounts for a very significant share of global Android traffic, making 360px a required test width alongside 390px and 412px.

The "smallest S25 form factor" means the Galaxy S25 is the choice for users who prefer compact phones. These users often browse one-handed on the go, where 360px wide content must be easy to navigate with a thumb. Ensure your primary interactive elements are accessible within the bottom two-thirds of the 780px height, where one-handed thumb reach is comfortable on a compact device.