Why Your ICO Favicon Looks Blurry — and How to Fix It

You converted your logo to ICO, uploaded it, and now the browser tab favicon looks soft and pixelated — even though your original image was crisp. This is one of the most common favicon mistakes, and the fix is simple once you understand what ICO files actually are.

What an ICO file actually is

An ICO file is a container — it holds multiple images at different resolutions inside a single file. The browser picks the most appropriate size based on where the favicon is being displayed. Browser tab, bookmark bar, pinned site, and Windows taskbar icons all display at different sizes.

When you convert a single large PNG to ICO, most converters just downscale it to one size (usually 16×16 or 32×32) and wrap it in an ICO container. That one-size approach is what causes blurriness — the image wasn't designed at that pixel density, it was scaled down by an algorithm.

The sizes that matter

The right approach

Design or export at the target size, then convert. The sharpest favicons are designed at exactly 16×16 and 32×32 pixels — or at minimum, exported from a vector source (SVG) at those exact sizes rather than scaled from a large raster image.

For most modern sites, the cleanest solution is to skip ICO entirely and use an inline SVG favicon. SVG scales perfectly to any size with zero blur:

If you need ICO for compatibility — particularly for Internet Explorer or Windows pinned sites — start with a clean 32×32 PNG that was either drawn at that size or exported from SVG at that exact resolution.

Modern favicon best practice

• Use an inline base64 SVG as your primary favicon — scales perfectly, no file request needed
• Keep a 32×32 PNG as a fallback for older browsers
• Use a 180×180 PNG for Apple touch icon (apple-touch-icon)
• Only generate ICO if you specifically need Windows taskbar support