AI image glossary
What Is Aspect Ratio?
Aspect ratio is an image's width-to-height proportion — 16:9, 1:1, 9:16. What the numbers mean and which ratio each platform expects.
The plain-English answer
Aspect ratio is the proportional relationship between an image's width and height, written as two numbers like 16:9 — for every 16 units of width, 9 of height. It describes shape, not size: a 1920×1080 wallpaper and a 640×360 thumbnail are both 16:9.
Ratios are the grammar of platforms: 16:9 for video and thumbnails, 1:1 squares for feeds and covers, 4:5 portrait for Instagram reach, 9:16 vertical for Stories, Reels and TikTok, 2:3 for print photos and book covers.
The practical rule: generate at the destination's ratio instead of cropping afterwards — composition made FOR the frame always beats composition cut down to it. Every CreArt generator lets you pick the ratio before generating.
Put it into practice
Pick the right ratio before you generate.
