The Snapchat Story / Ad size (1080×1920px)
Snapchat is built around vertical, full-screen content, so 1080x1920 pixels at 9:16 is the size for Stories and single-image ads alike. This fills the entire phone display, which is essential on a platform where the immersive full-screen experience is the whole point and letterbox bars immediately look out of place.
For ads especially, Snapchat enforces a safe zone: keep critical content, logos, and the call to action away from the top roughly 150 pixels and bottom roughly 300 to 340 pixels, where the interface and the swipe-up or attachment prompt live. Ignoring this is a common reason creative gets rejected or the message ends up half-covered.
Snapchat's audience skews younger and expects native, snappy visuals rather than polished corporate creative, so bold color and motion-friendly framing tend to perform. Because Snaps disappear fast and viewers tap through quickly, put your hook in the first moment and keep it centered in the safe zone so the point lands before someone advances to the next Snap.