Free tool
Favicon & icons
The little icon in the browser tab, on the phone home screen and next to your Google results. Each place wants its own size: here is what your site provides.
Five files are enough
favicon.ico
32 × 32
At the site root. Every browser and tool looks for it, even without a tag.
icon.svg
Vector
Sharp at any size. A media query inside the SVG can switch colours in dark mode.
apple-touch-icon.png
180 × 180
Opaque background, about 20 px of margin: iOS rounds the corners itself.
icon-192 / icon-512
Android
Declared in the manifest. Add a “maskable” version with the logo inside the central circle.
Why Google sometimes shows a globe
Google only shows your icon if it is square, at least 48 × 48 px (ideally a multiple of 48, or SVG), and reachable by its robot. After a change, it may take a few weeks to update.