Generate native CSS aspect-ratio rules and legacy padding-top hack fallbacks.
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, 9:16, 21:9, or Custom.
Toggle @supports fallback and set image fit mode.
Copy the stylesheet directly into your project.
Aspect-ratio prevents layout shifts (CLS) by reserving exact vertical container dimensions before media assets load.
It uses the classic padding-top percentage hack inside @supports not (aspect-ratio: ...).
Zero-egress companion tools in the Developer Tools suite
Convert raw CSS declarations, selectors, and stylesheets into clean Tailwind CSS classes.
Transpile JSON Schema Draft 7 & 2020-12 into strict TypeScript interfaces and runtime Zod schemas.
Generate compliant RFC 1035 BIND zone files with SOA, NS, A, AAAA, CNAME, MX, and TXT records.
Convert legacy TypeScript numeric/string enums into modern, bundle-friendly string union types.
