Convert ICO to PNG in Seconds

ICO is the format Windows uses for application icons, desktop shortcuts, and website favicons — and it's a genuinely unusual file format because a single .ico file can bundle several versions of the same image at different sizes and color depths, from a tiny 16×16 icon for a browser tab up to a crisp 256×256 version for a desktop. That flexibility is great for the operating system, but it means most everyday photo viewers, design tools, and websites don't know what to do with an ICO file at all.

Converting to PNG solves that instantly. PNG is a universally supported format with lossless compression and full transparency support, which makes it the natural target when you need to drop a favicon into a design mockup, use an app icon in a slide deck, or just look at what's actually inside an .ico file you found on your computer. Because PNG preserves transparency the same way ICO does, a round icon with a transparent background stays exactly that — round, with no white square added behind it.

This tool parses the ICO file's header and directory entries directly in your browser using nothing but the bytes of the file itself, so it can show you every size packed inside without ever sending the file anywhere. Once parsed, each size is decoded on the spot — modern Windows icons typically embed their larger sizes as plain PNG data already, which this tool extracts directly, while smaller bitmap-based sizes are reconstructed and redrawn locally before being exported as PNG.