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Aspect Ratio
Free aspect ratio calculator. Turn any width and height into a simplified ratio, resize to a target ratio, preview the shape live and copy the CSS. No sign-up required.

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| Website | aspectcalc.com | diffee.me |
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| Company | 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


AspectCalc turns any width and height into a simplified ratio, resizes to a target ratio, and shows a live visual preview as you type — so you see the actual shape before you commit to it, not just the numbers. How it works Type in a resolution (e.g. 1920×1080) and it shows the reduced ratio...
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As answered by people managing AspectCalc and Diffee.
AspectCalc's answer
HTML, CSS, JavaScript
AspectCalc's answer
Most aspect ratio calculators only do simple division and stop there. AspectCalc adds a live preview so you can visually confirm a crop or resize before committing, a "closest standard ratio" check for imprecise resolutions, and a one-click CSS export — all with no sign-up and no ads.
AspectCalc's answer
It handles both directions of the aspect ratio problem in one tool — calculating the ratio from a given size, and resizing to a target ratio — with a live visual preview that shows the actual shape as you type, not just numbers. It also flags how close a non-standard resolution is to the nearest common ratio (useful for catching things like a "16:9" screen that's actually slightly off), and lets you copy the CSS aspect-ratio property in one click.
AspectCalc's answer
Content creators, video editors and social media managers who need to resize content across platforms with different aspect ratios (Instagram, TikTok, YouTube), along with designers and front-end developers who need exact ratio math for layouts and CSS.
AspectCalc's answer
Built out of a recurring personal annoyance — manually calculating aspect ratios every time a video or image export needed to fit a different platform's required shape. Rather than doing the division by hand each time, AspectCalc turned that into a tool that handles both directions of the calculation with a live preview.
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