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.

What is the JPG to ICO Converter?

Free JPG to ICO converter. Turn JPEG photos into Windows .ico icon files with multiple embedded sizes (16, 32, 48px and up) instantly in your browser — no upload, no signup, your files never leave your device. It runs free in your browser on Gera Tools, with nothing uploaded.

JPG to ICO Converter

Name: JPG to ICO Converter
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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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)

Which sizes to include

Different contexts use different icon sizes, and embedding the right set in one file means no scaling artefacts in any context:

Size	Used for
16×16	Browser tab favicon, Explorer list view
32×32	Small desktop icon, taskbar at standard DPI
48×48	Standard desktop icon, Windows Explorer medium icons
64×64	High-DPI taskbar, some app launchers
128×128	macOS-style large icon, app store thumbnails
256×256	High-DPI desktop shortcut, modern app icon

For a website favicon, 16, 32, and 48 px is the standard set that covers all browsers. For a Windows desktop application icon, including 128 or 256 px gives sharp results on high-resolution (HiDPI) displays.

Why the ICO format uses multiple sizes

Operating systems and browsers do not scale a single icon image up or down; they select the closest embedded size and use it at 1:1. An icon file containing only a 16×16 image looks blurry when Windows displays it at 48×48 on a standard desktop. An icon with only 256×256 gets downsampled to 16×16 for the tab favicon, which is also imprecise. Embedding several sizes in one .ico file is what lets the OS pick the sharpest match for each rendering context without scaling.

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. If you need a transparent or shaped icon, start with a PNG file instead. Everything runs locally in your browser — your images are never uploaded.