Prompt Guides
The Best AI Image Aspect Ratios for Every Platform
Stop cropping after the fact. Generate your AI image in the right aspect ratio for Instagram, YouTube, posters and print.
Square: 1:1
Instagram feed, profile pictures, album art. The safe default for social.
Portrait: 9:16 / 2:3
Stories, Reels, Shorts, Pinterest. Always think about top-and-bottom UI overlays when composing.
Landscape: 16:9
YouTube thumbnails, website hero banners, blog headers.
Print: 3:4 / A-series
Posters, prints, magazine covers. Use the AI Poster Maker for print-ready dimensions.
Ali Rahman
Writer · ROOK.oi team
Sharing tips, prompts and lessons learned from building AI image tools used by thousands of creators every day.