How to Create an ICO Favicon from a PNG Logo
A favicon is the small icon that appears in a browser tab next to your page title, and it's one of those small details that makes a website feel finished and professional rather than generic. Most design tools export logos as PNG, but browsers specifically expect a file called favicon.ico in ICO format — so there's one extra conversion step between your finished logo and a working favicon.
Start with a square PNG, ideally at least 256×256 pixels, with a transparent background if your logo doesn't have a solid backing color. Working from a large source image matters because the ICO format actually bundles several sizes together internally — the browser picks whichever fits the context, from a tiny 16×16 tab icon up to larger sizes used for bookmarks or shortcuts — and generating each size from a large source image keeps every version sharp.
Before converting, it's worth simplifying an overly detailed logo specifically for favicon use. At 16×16 pixels — the size most browser tabs actually display — fine details, thin lines, and small text become an indistinct blur. Many brands use a simplified mark (just an icon or initial, without a full wordmark) as their favicon for exactly this reason.
Once you have a clean, square PNG, converting it to ICO is a single automated step: upload the PNG to a converter that generates a proper multi-resolution ICO file (bundling 16×16, 32×32, 48×48, and larger sizes together), and download the result as favicon.ico.
The last step is installation: upload favicon.ico to the root directory of your website, so it's reachable at yoursite.com/favicon.ico. Most browsers check that location automatically. For more control, or to support additional icon formats for mobile home screens, add an explicit tag to your page's <head>: <link rel="icon" href="/favicon.ico">.
After uploading, browser caching can sometimes delay the new favicon from appearing immediately — a hard refresh or clearing your browser cache usually resolves it if the new icon doesn't show up right away.
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