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A favicon needs to look sharp at multiple sizes: browsers use 16×16 in tabs, 32×32 for most taskbars, and larger sizes for pinned tiles and shortcuts. The ICO format bundles all of those into one file, and browsers pick the right size for the context automatically. You need one PNG source — your logo or icon — and this tool handles the resizing and bundling.
The output ICO file bundles the standard favicon sizes: 16, 32, 48, 64, 128, and 256 px — all packed into a single <code>.ico</code> container. A browser loading your site picks the appropriate embedded size rather than scaling a single image up or down, which is why ICO files look crisp in every context where a plain PNG might look blurry at the wrong size.
Start with a square PNG at least 256×256 px — ideally 512×512 or larger. The converter scales it down to generate each embedded size, and a higher-resolution source means better detail at 16 and 32 px where the icon is most visible. Transparent backgrounds carry through correctly; icons with transparency look clean against any browser chrome color without a white square around them.
Avoid PNGs with fine text or thin lines: at 16×16 px, those details vanish regardless of how good the source is.
Put <code>favicon.ico</code> at the root of your web server (e.g., <code>https://example.com/favicon.ico</code>). Browsers check this location automatically without any HTML needed. For additional control — linking PNG favicons for specific sizes or Apple Touch Icons — use <code><link rel="icon"></code> tags in your HTML <code><head></code>. The ICO file handles the core use case with zero configuration.
You can, but the output will be letterboxed or cropped to fit the square ICO format. For best results, start with a square image or crop it to square before converting.
Yes. The bundled sizes inside the ICO file support alpha transparency, so your icon will look correct against any browser tab background color.
At least 256×256 px. Larger is better because the converter scales down; scaling up a small PNG produces a blurry 256 px result.
Yes. Upload up to 200 PNG files; each gets its own ICO output, packaged in a ZIP.