What matters
Instagram Ad — Story dimensions at a glance
Instagram story ads fill the screen at 1080×1920. They appear between organic stories and must feel native to avoid instant swipes. The CTA button occupies the bottom area.
Story ads offer immersive full-screen placement. Correct sizing ensures seamless integration with organic stories, maximizing the 2-3 seconds of attention you get.
Non-vertical creative gets auto-zoomed, looking obviously different from surrounding organic stories and triggering immediate swipes.