ICO Icon Converter
Convert images to .ico with multi-size packaging (16/32/64/128/256px). Use our free online calculator for fast, accurate results with no registration required. Simple, private, and ready to use in seconds.
How to use ICO Icon Converter
- 1Click "Upload image" and pick a PNG / JPG source (a square, high-res image works best).
- 2The tool auto-generates 16 / 32 / 64 / 128 / 256 px icons and packs them into a single .ico file.
- 3Click "Download ICO" to get a favicon compatible with Windows and browsers.
Why ICO conversion matters and where to use it
ICO file = multi-resolution frames of one image (16/32/64/128/256px)ICO is a container that embeds several bitmap sizes, so the system can pick the sharpest one at any scale. Unlike simply renaming an extension, a multi-size package stays crisp in the taskbar, desktop, and browser address bar.
Conversion and packing happen locally in your browser with no upload, ideal for website favicons, app icons, and Windows shortcut icons.
Frequently asked questions
Why multiple sizes?
Different places (desktop, taskbar, browser tab) show different sizes; multi-size ICO avoids stretching and blur.
Is transparency supported?
Yes. Transparent areas in a PNG source are preserved as an alpha channel in the ICO.
Where do I use the ICO?
As a website favicon, a Windows program icon, or a shortcut icon.