Best Favicon Sizes for Websites
There are dozens of recommendations online. Here's the minimal set that actually covers 100% of users.
5 min read
What browsers request
Desktop browsers request 16×16 (tab), 32×32 (bookmark bar), and 48×48 (search results). All three live happily inside one .ico file.
What operating systems request
Windows Start menu and File Explorer can request up to 256×256. macOS prefers an .icns but accepts .ico. Bundle 16, 32, 48, 64, 128, 256 in your .ico to cover everything.
What PWAs and mobile request
Add 180×180 (apple-touch-icon) and 192×192 + 512×512 PNGs (web manifest) for clean home-screen installs.
The minimum viable set
Multi-size favicon.ico + apple-touch-icon.png (180×180) + a 512×512 PNG in your manifest. That's it.