Convert ICO to SVG: Free Online Converter

ICO (Windows Icon) is a raster-based multi-resolution icon container, while SVG (Scalable Vector Graphics) is an XML-based vector format that scales to any size without pixelation. Converting ICO to SVG vectorizes the icon's pixel data into geometric paths and curves, producing a resolution-independent version of the icon that renders sharply at any display size from a 16x16 favicon to a billboard.

Icon vectorization is particularly effective because icon designs typically use simple shapes, flat colors, and distinct edges -- all qualities that vector tracing algorithms handle well. The resulting SVG can replace the ICO in web development, where SVG favicons and icons are increasingly preferred.

SVG icons scale infinitely, eliminating the need to maintain multiple resolution variants. A single SVG icon file replaces the 16x16, 32x32, 48x48, and 256x256 versions stored in an ICO container. For responsive web design, SVG icons render perfectly on standard displays, Retina screens, and 4K monitors without any blurriness.

SVG icons are also smaller than ICO files in most cases. A typical multi-resolution ICO file is 50-200 KB, while the equivalent SVG icon is often 1-10 KB. This significant size reduction improves web performance. Additionally, SVG icons can be styled with CSS (changing colors on hover, dark mode variants) and animated with JavaScript -- capabilities that ICO cannot provide.

The largest resolution image from the ICO container is extracted and decoded. The raster pixels are then traced using vector tracing algorithms (vtracer) that identify distinct color regions, generate Bezier curve paths along edges, and optimize path complexity. For simple icons with flat colors, the tracing produces clean geometric shapes that closely match the original design intent. Configuration options include color precision, corner threshold, and speckle filtering. The output is a standard SVG 1.1 document, optimized by SVGO to minimize file size.