What sizes go into the .ico?

Up to six: 16, 32, 48, 64, 128, and 256 pixels. The smaller sizes are always included; the larger ones are added only when your source PNG is at least that wide, so the icon never gets upscaled past its real resolution.

Should my PNG be square?

Square works best, since icons are drawn in square slots. A non-square PNG is scaled to fit and centered on a transparent background, so nothing is cropped, but it will sit inside a square with empty space on two sides.

Is transparency kept?

Yes. Each size is stored as a PNG inside the .ico, and PNG carries a full alpha channel, so transparent and semi-transparent pixels in your source come through unchanged.

How do I use the file as a favicon?

Save it as favicon.ico in your site's root, or link it in the page head with . Browsers also request /favicon.ico automatically when no icon is declared.

Can I convert a JPG instead?

Yes. The tool decodes any image the browser can read, including JPG, so a JPG is converted the same way. Note that JPG has no transparency, so its icon sits on a solid background.

PNG to ICO

Packs your PNG into a multi-size .ico favicon (16–256px), right in your browser.

What this does

An .ico file is a small container that holds the same icon at several pixel sizes. A browser tab bar reaches for the 16 or 32 pixel image, a bookmark or shortcut pulls a larger one, and Windows picks whichever size fits the place it draws the icon. A single PNG only carries one resolution, so this tool reads your PNG and packs it into one .ico that bundles the favicon sizes from 16 up to 256 pixels.

The conversion runs entirely in this browser tab. The PNG is decoded on a canvas, redrawn at each size, and each rendering is stored as a PNG inside the .ico directory — the format every current browser and operating system reads. Your image is never uploaded; it stays on your machine, and the finished favicon downloads straight from the page.

How it works

1Drop a PNG, or click to pick one.
2It is redrawn at 16, 32, 48, 64, 128, and 256 pixels and packed into one .ico.
3Download the multi-size favicon.

Built on web standards

Built with standard browser APIs — no third-party libraries.

Frequently asked questions

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