CSS Aspect Ratio Generator
Generate CSS aspect ratio values for responsive images and video embeds with live preview.
About CSS Aspect Ratio Generator
The CSS Aspect Ratio Generator on ToolsOfIndia is a free browser-based tool built for front-end developers and video embedders. Generate the CSS for a fixed aspect ratio box - 16 to 9, 4 to 3, 1 to 1, 21 to 9 and custom - so a video, image or placeholder holds its shape responsively. The tool uses the modern aspect-ratio property with a padding-top fallback for older browsers, and shows the exact CSS for both. Developers use it for responsive video embeds and image placeholders, and the tool prevents the layout shift that hurts both looks and speed. Because it runs locally, nothing is uploaded, and the output is plain CSS. It is the small generator that keeps a media box shaped right at any width. Because it runs in your browser with no signup, you can experiment freely - the tool just hands you clean CSS you can trust. Real-world uses include embedding a 16 to 9 video responsively, making a square image placeholder, and setting a 21 to 9 banner ratio. It works just as well on a budget Android phone as on an office desktop, over any connection.
How to Use the CSS Aspect Ratio Generator
- Open the CSS Aspect Ratio Generator tool above — it loads instantly in your browser.
- Enter your values in the input fields provided.
- The result updates immediately — no calculate button needed (or click Calculate where shown).
- Copy or use your result directly. Nothing is stored or sent to any server.
Key Features of CSS Aspect Ratio Generator
- Preset ratios like 16:9, 4:3, 1:1
- Custom ratio input
- Live preview with CSS output
- Common and custom ratios
- Modern aspect-ratio property
- Padding-top fallback
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Frequently Asked Questions
What is CSS aspect ratio?
The CSS aspect-ratio property defines the width-to-height ratio of an element, ensuring responsive scaling for images, videos, and containers without JavaScript.
How to maintain aspect ratio in CSS?
Use the aspect-ratio property: aspect-ratio: 16/9; or the padding-bottom trick for older browsers. Our generator handles both methods automatically.
Why use an aspect ratio generator?
An aspect ratio generator saves time by providing instant CSS code for common ratios like 16:9, 4:3, and custom dimensions, eliminating manual calculations.
What is the aspect-ratio property?
A modern CSS property that sets the box ratio directly, like aspect-ratio 16 to 9, without the old padding hack.
Why use a padding-top fallback?
Older browsers lack aspect-ratio support, so the padding-top percentage hack keeps the ratio there too.