Reference / Glossary / Creative and formats
Aspect Ratio
The proportion of width to height of an image or video. The working set in digital advertising is 16:9 (landscape video), 9:16 (vertical, Stories and Reels), 1:1 (square feed), 4:5 (portrait feed), and 1.91:1 (link ads). Producing every asset in 9:16, 1:1, and 16:9 covers nearly all placements.
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Cite this entry:
Agency Echelon. "Aspect Ratio." Agency Echelon Reference, reviewed September 2026. https://agencyechelon.com/reference/glossary/aspect-ratio/