Creating vinyl stickers, die-cut decals, and Cricut graphics requires an outer white contour offset that frames the artwork and provides cut-line clearance. This tool automatically traces transparent image alpha boundaries to generate a smooth, solid white sticker silhouette outline around your graphic on an in-browser canvas.

### How the Alpha Silhouette Tracing Works The border generator scans transparent PNG or WebP images to construct an expanded perimeter: - **Radial Offset Extrusion**: Computes 24 rotational angle offsets at radius intervals matching your selected border width (`pad + cos(angle) * borderWidth`, `pad + sin(angle) * borderWidth`). - **White Silhouette Fill**: Draws overlapping silhouette passes into an offscreen canvas buffer to form a continuous, solid white border without gap artifacts. - **Artwork Compositing**: Centers and composites the original full-color artwork over the solid white silhouette foundation. - **Configurable Border Width**: Adjust the border slider (default 16 px) to achieve subtle thin outlines or heavy die-cut borders suitable for peel-and-stick vinyl decals.

### Worked Sticker Generation Example Upload a 500×500 pixel transparent PNG character illustration: - Select a **Border Width** of `16 pixels`. - The canvas expands padding to 64 pixels total, rendering a 564×564 pixel composition. - The 24-step radial algorithm forms an unbroken 16 px white margin following every contour, curve, and cutout of the artwork. - Click **Download Sticker PNG** to save a 32-bit transparent PNG ready for digital print-and-cut software.

### In-Browser Privacy & Speed All image loading, canvas drawing, and PNG encoding execute 100% inside your local web browser. Your illustrations and personal photos are never uploaded to remote servers or stored externally.