Can a JPG become a transparent icon?

No. JPG has no alpha channel, so the resulting icon has a solid background. If you need transparency, start from a PNG instead.

Which sizes should I include?

For a website favicon, 16, 32 and 48px covers almost everything. Add 64, 128 or 256px if you also want a crisp desktop or taskbar icon.

What sizes can the icon hold?

You can tick any of 16, 32, 48, 64, 128 and 256 pixels. The default selection is 16, 32 and 48px — the standard favicon set — and every chosen size is embedded in one .ico file.

Why embed multiple sizes in one file?

A single .ico can carry several resolutions so Windows and browsers pick the sharpest one for each context — a small tab favicon, a larger taskbar icon or a big desktop shortcut — without scaling artefacts.

Does it crop or stretch a non-square photo?

Each size is square, so a rectangular JPG is drawn onto a square canvas. For best results start from a roughly square image, or crop it square first.

Can I convert more than one JPG at a time?

Yes. Drop several JPGs and each becomes its own multi-size .ico with a separate download button.

Are my photos uploaded anywhere?

No. The conversion runs entirely in your browser using the canvas API, so your JPG never leaves your device.

JPG to ICO Converter

JPG to ICO — make a Windows icon in your browser

Convert a JPG photo into a Windows .ico icon with several sizes packed into one file. A .ico is a small container that holds multiple resolutions, so Windows and browsers can pick the sharpest version for a tab favicon, taskbar icon or desktop shortcut. This tool builds that file for you with no upload and no signup.

How it works

For each size you tick, your JPG is drawn onto a square <canvas> at that pixel size and encoded as a PNG with canvas.toBlob. The PNG payloads are then wrapped by hand into the ICO container format: a 6-byte ICONDIR header, one 16-byte ICONDIRENTRY per image (recording its size, bit depth and byte offset), then the PNG data itself. Modern Windows (Vista and later) reads PNG payloads inside an .ico directly, so the result works everywhere a favicon or icon is expected.

Setting	Value
Available sizes	16, 32, 48, 64, 128, 256 px
Default sizes	16, 32, 48 px
Payload format	PNG inside the ICO container
Transparency	None (JPG has no alpha channel)

Example

Pick 16, 32 and 48px and drop a 512×512 JPG. The tool renders the photo at each of the three sizes, encodes them as PNG, and bundles them into a single icon.ico. Windows then shows the 16px version in a list, the 32px version on the taskbar and the 48px version on the desktop — all from one file.

Because JPG has no transparency, the icon keeps a solid background. Everything runs locally in your browser — your images are never uploaded.