PNG, ICO, and SVG Compared

Deciding which favicon files to include in your server directories can be confusing. Let's look at the three primary formats: ICO, PNG, and SVG.

1. ICO (The Legacy Fallback)

The Microsoft `.ico` format is a container that holds multiple sizes (typically 16x16, 32x32, and 48x48 pixels) inside a single file. While older browsers like Internet Explorer required this format exclusively, today it is maintained as a universal fallback for legacy systems.

2. PNG (The Modern Standard)

PNG files support transparency, rich 24-bit color palettes, and have excellent compression ratios. Modern browsers prefer high-resolution PNGs over ICO files because they scale beautifully on retina screens. You typically define a 16x16 and 32x32 PNG for desktop browser tabs.

3. SVG (The Vector Future)

SVGs are vector-based, meaning they scale infinitely without pixelation. They have incredibly small file sizes. Additionally, SVGs support CSS media queries inside the markup, allowing the icon to switch color schemes dynamically when a user activates dark mode in their operating system.