WeVividWeVividGenerate a favicon from an image, or check an existing site's favicon.
16×16 and 32×32 cover browser tabs, 180×180 is for Apple touch icons, and 192×192 / 512×512 cover Android home-screen and PWA icons. Generating all of them covers virtually every platform.
Not every site keeps its favicon at the standard /favicon.ico path — some reference it via a <link> tag pointing elsewhere. If nothing loads, the site likely uses a non-standard favicon location.
No — every size is generated locally in your browser using the Canvas API.