Calculate pixel crop dimensions and offsets for 16:9, 4:3, 1:1, and 9:16 aspect ratios.
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.
Input width and height in pixels (e.g. 1920x1080).
Choose 16:9, 4:3, 1:1, 9:16, or 21:9.
Copy crop width, crop height, and center offset coordinates.
9:16 vertical ratio is the standard for Instagram Reels, TikTok, and YouTube Shorts.
Offsets evenly distribute the cropped margins on left/right or top/bottom to keep the image centered.
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