What sizes does the .ico contain?

It embeds the standard favicon sizes — 16, 32, 48, 64, 128, and 256 pixels. Smaller sizes are always included; larger ones are added only up to the resolution of your source JPG, so a small image is not upscaled past what it can fill.

What happens to a non-square JPG?

Each size is square, so the image is scaled to fit inside the square and centered. The aspect ratio is preserved, with transparent padding filling the rest of the frame.

Where do I use the resulting file?

Save it as favicon.ico at the root of a website, or use it as a Windows application or shortcut icon. Browsers and Windows read the multiple embedded sizes directly.

Does converting from JPG affect quality?

JPG is lossy, so any compression artifacts already in the source carry over. The icon sizes are re-encoded as PNG inside the .ico, which adds no further loss, but a small JPG cannot gain detail it never had at larger sizes.

Is my image uploaded to a server?

No. The decode, scaling, and .ico encoding all happen in your browser. The JPG never leaves your device.

JPG to ICO

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

What this does

An .ico file is the format Windows and web browsers read for icons and favicons. Unlike a flat JPG, one .ico holds several copies of the same image at different pixel sizes, and the browser or OS picks whichever size fits the spot it needs to fill — a 16px tab, a 48px shortcut, a 256px detail view. This tool takes a single JPG and packs it into that multi-size container.

The conversion runs entirely in this tab. Your JPG is decoded onto a canvas, scaled to each favicon size from 16px up to 256px, and each size is re-encoded as PNG data inside the .ico directory. Nothing is uploaded; the file is built in your browser and handed straight to your download folder.

How it works

1Drop your JPG, or click to pick one.
2It is decoded and packed into a multi-size .ico (16–256px) in the tab.
3Download the .ico file.

Built on web standards

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

Frequently asked questions

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