What is inside the .ico
A .ico file is a container holding the same image at several sizes. This tool embeds PNG images at 16×16, 32×32 and 48×48, which covers browser tabs, bookmarks and desktop shortcuts. Square images work best — wide or tall images are center-cropped to a square first, and the preview shows exactly what will be embedded.
Using it as a favicon
Save the file as favicon.ico in your website's root folder and add <link rel="icon" href="/favicon.ico"> to your pages. Most browsers pick it up automatically from the root without any code at all.
Frequently Asked Questions
Why does my icon look blurry at 16 pixels?
Tiny sizes hide detail — simple, high-contrast images with one clear subject make the best icons. Detailed photos turn to mush at 16×16.
Does the .ico work everywhere?
Yes — the PNG-in-ICO format is supported by all modern browsers and Windows. Very old Internet Explorer versions wanted BMP-based icons, but that era is over.
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