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Find the perfect size and aspect ratio for AI-generated images
An image aspect ratio is the proportional relationship between width and height (e.g., 16:9, 1:1). Choosing the correct ratio ensures images display properly across platforms without cropping or stretching.
Copy these prompts and replace [SUBJECT] or [PRODUCT] with your content.
Professional product photography of [PRODUCT], studio lighting, white background, high detail, commercial quality, aspect ratio 1:1
Eye-catching [SUBJECT] for social media, vibrant colors, modern style, clean composition, trending aesthetic, aspect ratio 1:1
Stunning hero image of [SUBJECT], dramatic lighting, cinematic quality, high resolution, website header style, aspect ratio 1:1
Digital illustration of [SUBJECT], flat design, vector style, bold colors, minimal background, aspect ratio 1:1
Different platforms and use cases require specific image dimensions. Using the correct aspect ratio ensures your images display properly without cropping or stretching.
Midjourney: /imagine [prompt] --ar 16:9
DALL-E: Select size in the interface
Stable Diffusion: Set width/height params
Tip: Include aspect ratio in your promptFormula
Aspect Ratio = Width / Height | GCD Simplification: W:H = (W/GCD):(H/GCD) | Scale to target: NewW = TargetH × (W/H)GCD = Greatest Common Divisor — used to simplify ratio (e.g., 1920/1080 → GCD=120 → 16:9)
TargetH = Desired output height; multiply by ratio to get correct width
W/H = Decimal ratio used to maintain proportions when scaling to new dimensions
Worked Example
Instagram Post: 1080×1080 → ratio
Did you know? The 16:9 widescreen aspect ratio was chosen as the HDTV standard in 1988 because it is the geometric mean of 4:3 (traditional TV) and 2.35:1 (cinematic widescreen), giving it the best average letterboxing for both formats.
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