What matters
Instagram Ad — Story dimensions at a glance
Story ads take over the full screen at 1080×1920. The CTA button occupies the bottom area, so the creative should stop its main message above that zone.
Full-screen vertical ads feel native and immersive when sized correctly. Wrong ratios create bars or awkward zooming that breaks the seamless story flow.
Landscape or square creative gets auto-zoomed and cropped, often cutting off key product details. The CTA button can also overlap important text.