Aspect Ratio Guide for Facebook

Facebook is no longer one square-first feed. It is a mobile-first system that includes Feed, Stories, Reels, Cover Photo, Profile Photo, Carousel, Marketplace, and paid placements.

Start by choosing the content system, then choose the ratio. A 4:5 Feed post, a 9:16 Reel, and a desktop Right Column ad are not the same design problem.

Facebook Feed supports a wide ratio range, but mobile screen occupancy is not equal. A portrait 4:5 post gives noticeably more vertical presence than 1:1, and far more than a 16:9 landscape image.

Because Facebook is overwhelmingly mobile, 4:5 should be the default for Feed reach. Use 1:1 when cross-device consistency matters more, and 16:9 when the content itself is landscape-native.

Stories are Facebook's cleanest full-screen organic format. The viewer is not comparing adjacent posts, so the creative can hold the full canvas as long as the UI overlays are respected.

The working area is generous compared with Reels: the top profile bar and bottom reply bar leave a central 1080 x 1330px area for faces, titles, products, and CTAs.

Reels are the most restrictive Facebook surface. The top overlay is manageable, but the bottom 35% of the frame is a large UI danger area for captions, music, and controls.

This is the most common Facebook template failure: a Story design gets reused as a Reel, and all bottom text disappears under the Reels interface.

Cover Photo is the easiest Facebook asset to mis-design because desktop and mobile do not reveal the same crop. A good cover is built around the overlap, not around the full canvas.

Upload at 820 x 462px and place all key content in the centered 640 x 312px area. Use the rest as supporting background only.

Profile Photo is a square source shown as a circle. The corners disappear, and the asset shrinks sharply in Feed contexts, where it may appear around 40 x 40px.

Put the logo mark or face in the central 80% of the square. Do not use tiny text or edge-locked symbols that depend on the cropped corners.

Carousel is powerful for product, education, and step-by-step content, but it is unforgiving when each card has a different shape. Visual consistency is the format.

Use 1:1 as the default. It gives every card the same crop behavior, works across organic and paid contexts, and is safer than mixing portrait and landscape cards.

Organic Facebook content and paid Facebook placements are not identical. Feed ads often prefer 1:1 for cross-device reliability, while mobile-first Feed ads and Reels ads need taller formats.

Plan ads by placement. A Right Column ad, a Reels ad, and a Collection ad should not share one source file.

Facebook ratio decisions should start from mobile. Feed reach, Stories attention, Reels recommendations, and ad delivery all reward content that fits the phone screen and avoids UI overlays.

Use the decision tree to separate organic content from paid placements before choosing 4:5, 1:1, 9:16, or 1.91:1.

Facebook is more efficient than YouTube because its main creative family is vertical-first. A 9:16 shoot can produce Reels, Stories, and a 4:5 Feed crop without destroying the composition.

Keep one 4:5 Feed master and one 9:16 vertical master. From those two files, derive the square, Carousel, ad, and cross-platform variants.

Use CSS aspect-ratio containers to lock Facebook Feed, Stories, Reels, Cover Photo, Carousel, and ad previews before real media lands in the layout.

These references cover the adjacent Meta workflow, 4:5 and 9:16 ratio math, square carousel planning, and CSS implementation.