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Aspect Ratios Explained: Pick the Right One for Every Platform

Guides6 min read

The short answer

Aspect ratio is simply width versus height: 1:1 is square, 4:5 is portrait, 9:16 is full vertical, 16:9 is widescreen. Instagram feed favors 4:5, Reels and Shorts need 9:16, YouTube wants 16:9. When ordering AI images on Etch — ₹15 per image — state the ratio in your brief so the composition is built for it; cropping a square image into vertical throws away half the frame.

Every creator has felt this pain: a beautiful image, posted, and the platform crops out the product, the face, or the headline. The culprit is almost always aspect ratio — the shape of the image versus the shape of the slot it fills. Get the ratio right at creation time and the problem disappears. Here's the complete, jargon-free map.

The four ratios that matter

Which ratio for which platform

PlacementBest ratioNotes
Instagram feed post4:5Maximum scroll presence; keep text central
Instagram Reels / Stories9:16Full vertical; keep key elements away from edges
YouTube video / thumbnail16:9Widescreen; thumbnails need central safe area
YouTube Shorts9:16Vertical, like Reels
WhatsApp Status9:16Full-screen vertical
Facebook feed4:5 or 1:1Portrait performs, square is safe
Website hero16:9Wide banner compositions
Pitch decks16:9Standard slide shape

Safe areas: the invisible frame inside the frame

Platforms overlay their own UI on your image — profile pictures, like buttons, captions, progress bars. On Reels and Shorts, the bottom fifth and the right edge are effectively dead zones. Brief accordingly: “9:16 vertical, keep the subject and any key detail in the central area, no important elements near the edges.” A composition that respects safe areas looks intentional everywhere; one that doesn't looks accidentally cropped everywhere.

How to brief ratios when ordering AI images

State the ratio as part of the camera section of your prompt: “9:16 vertical composition, subject centered with headroom”. On Etch, one image costs ₹15 — and planning ratios up front is free. For a campaign that needs three placements, the ₹49 4-pack covers the variants: same concept, three native compositions, no destructive cropping. See the pricing page for the full catalog.

Resolution: what actually matters

Ratio is shape; resolution is detail. For social feeds, anything at or above the platform's display size looks sharp — the platforms compress uploads anyway. What matters more than pixel counts: generate at the final ratio (not a crop), keep text large enough to survive compression, and check the image at phone size before publishing. If it reads clearly as a 5cm thumbnail, it works.

Common ratio mistakes to avoid

Generate your next creative in the right ratio for ₹15

State the ratio in your brief — 4:5 for feed, 9:16 for Reels, 16:9 for YouTube.

Create a ratio-perfect image

Frequently asked questions

What is aspect ratio in simple terms?

The shape of the image, written as width:height. 1:1 is a perfect square, 16:9 is a widescreen rectangle (your TV), 9:16 is the same rectangle turned upright (your phone held vertically), and 4:5 is a slightly tall portrait. Same content, different shapes — and each platform has a favorite.

Which aspect ratio should I use for Instagram?

For the feed, 4:5 portrait takes up the most screen space as people scroll — more presence than a 1:1 square. For Reels and Stories, use 9:16 full vertical. For profile grids, 1:1 squares keep the grid tidy. Match the ratio to the placement, not the other way round.

Can I just crop one image for all platforms?

You can, but cropping is surgery: turning a 16:9 landscape into 9:16 vertical discards roughly two-thirds of the frame, usually including something important. It's far better to generate — or brief — each ratio natively. The ₹49 4-pack is a natural fit: one concept, multiple crops planned from the start.

Does aspect ratio affect AI image quality?

It affects composition, not quality. A prompt briefed as “9:16 vertical” gets a composition designed for vertical — subject placement, negative space, and balance all adapt. A square image cropped to vertical gets none of that. Always state the ratio up front.

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