What is an aspect ratio?

An aspect ratio describes the proportional relationship between the width and height of an image, display, or video canvas (expressed as two numbers separated by a colon, such as 16:9).

Are my dimension inputs or project resolutions sent to a server?

No. All Euclidean GCD calculations, dimension scaling, and visual previews execute strictly inside your local browser memory.

Aspect Ratio & Dimension Scaler — Free In-Browser Calculator

Understanding Aspect Ratio Math & Euclidean GCD Simplification

An aspect ratio defines the relationship between an image or video canvas width ($W$) and height ($H$). Finding the canonical simplified ratio requires computing the Greatest Common Divisor (GCD) using the Euclidean algorithm:

$$\text{Simplified Ratio} = \left(\frac{W}{\text{GCD}(W, H)}\right) : \left(\frac{H}{\text{GCD}(W, H)}\right)$$

For instance, a $3840 \times 2160$ (4K UHD) resolution has a GCD of $240$, simplifying precisely to $16:9$. Aspect Ratio Scaler evaluates these dimension calculations in real-time within device RAM.

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Frequently Asked Questions

How do I implement aspect-ratio in modern CSS?

Use the native CSS property aspect-ratio: 16 / 9; on the target container. This replaces older padding-top percentage hacks.

Can I scale non-standard custom dimensions offline?

Yes. All proportional calculations and live preview rendering run locally inside your browser runtime with complete offline availability.