Sample ICO File Download

ICO is the format behind browser tabs, desktop shortcuts, and app icons — its defining feature is that a single .ico file can bundle multiple image sizes (16×16, 32×32, 48×48, and more) inside one container, letting the OS or browser pick whichever resolution fits the context.

It's still the format browsers look for by default at /favicon.ico, even though modern sites also ship PNG or SVG favicons declared explicitly in HTML — ICO remains the universal fallback every browser understands without any extra markup.

Use the sample below to test ICO parsing, confirm a favicon generator produces a valid multi-resolution file, or check that an image library correctly reads the embedded image sizes.