Free Aspect Ratio Box Generator
Create responsive containers that maintain aspect ratios with our free tool. Videos and images.
- Common ratio presets (16:9, 4:3, 1:1)
- Custom ratio input
- Modern CSS aspect-ratio property
- Legacy padding-bottom fallback
- Responsive by default
Frequently Asked Questions
When should I use aspect ratio boxes?
Use them for video embeds, responsive images, map containers, and any element that needs to maintain proportions across screen sizes to prevent layout shifts.
What's the padding-bottom technique?
Before CSS aspect-ratio, developers used padding-bottom percentages (e.g., 56.25% for 16:9) on a container with a positioned child. It's still useful for older browser support.
Does aspect-ratio work in all browsers?
CSS aspect-ratio is supported in all modern browsers (Chrome 88+, Firefox 89+, Safari 15+). Use the padding technique as a fallback for older browsers.