Calculate 16:9, 4:3, 21:9, and custom dimensions with CSS snippets.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Choose 16:9, 4:3, 1:1, 21:9, 9:16 or enter a custom ratio.
Type either width or height to solve for the missing proportional dimension.
Copy calculated pixel values or CSS aspect-ratio properties with visual canvas preview.
Common 16:9 resolutions include 1920x1080 (Full HD), 2560x1440 (2K QHD), and 3840x2160 (4K UHD).
The modern CSS aspect-ratio property (e.g., aspect-ratio: 16 / 9;) allows elements to maintain proportions without padding hacks.
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