What is 4:5 portrait format? The post shape taller than a square, explained

By TechCompare · Updated November 2026 · How we check

4:5 suits a portrait post that needs more height than a square without going all the way to 9:16.

Screen A: 16:9

Screen B: 4:5

Difference: 4:5 is 55.0% narrower than 16:9

4:5 next to 16:9 at the same height, so it looks narrower, not taller. Pre-loaded. Swap in another ratio to compare width differences side by side.

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4:5 is a portrait frame, four units wide for every five tall, so it's taller than a square and shorter than 9:16. A 1080 × 1350 image matches it exactly. Meta's Instagram feed ad requirements crop images that are taller than 4:5 back to 4:5.

Aspect ratio

4:5

6.1" diagonal

Dimensions

9.7 cm × 12.1 cm3.8" × 4.8"

6.1" at 4:5

How this is calculated

As of November 2026, Meta's media requirements for Instagram feed ads list a "4:5 aspect ratio" and "any aspect ratios in between 1.91:1 and 4:5." For images, "If an image is taller than 4:5 without a cropping spec, Instagram crops it to 4:5." Those are ad rules, so check the current rules for regular posts before you rely on them.

Divide 1080 by 1350 and you get 0.80, the exact 4:5 value. A square frame is 25% wider than a 4:5 frame at the same height. A 4:5 frame is 42% wider than a 9:16 frame at the same height.

Verdict

Use 4:5 when the subject is upright and a square leaves too little height for it. The frame keeps more height than a square and less than 9:16, so it works as a middle choice for one portrait cut. Export at 1080 × 1350 to match the frame exactly. If you also make a square or 9:16 version, start from the same source so the framing stays consistent.