Which favicon files do you actually need?
Older generators produce twenty or more files for long-gone platforms. Current browsers need far fewer. The set this tool generates follows the widely used guide by Evil Martians, which has been kept up to date since 2021: a 32×32 favicon.ico, a scalable icon.svg, a 180×180 apple-touch-icon.png, and 192 and 512 pixel PNGs referenced from a web app manifest, one of them maskable.
Each file has a job. favicon.ico answers the many tools, feed readers and older browsers that request /favicon.ico directly without reading your HTML. icon.svg gives modern browsers a sharp icon at any size and density. The Apple touch icon is used when someone adds your site to an iPhone or iPad home screen. The manifest icons are used by Android and desktop browsers when a site is installed as an app and on splash screens.