CSS Mask Image & Alpha Cutout Studio
Design alpha gradient masks for images, card fadeouts, and modern hero UI transitions.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. No data is ever transmitted across the network.
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.
How to Use CSS Mask Image & Alpha Cutout Studio
Choose from Bottom Fadeout, Top Fadeout, Center Spotlight, or Vignette.
Adjust start opaque point and end transparency percentages.
Copy the cross-browser -webkit-mask-image and mask-image stylesheet rules.
Frequently Asked Questions
What is CSS mask-image?
The mask-image CSS property hides portions of an element using the alpha channel of a gradient or SVG, creating smooth edge fadeouts.
Why include -webkit-mask-image?
Webkit-based browsers (Chrome, Safari, Edge) require the -webkit- prefix for full mask-image compatibility.
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