Icon Converter
Turn any image into a multi-resolution Windows .ICO file. Pick the sizes you need, add rounded corners or a background, and download — all in your browser.
Creates a multi-size Windows .ICO · nothing is uploaded.
How to convert an image to ICO
- 1
Drop or browse an image (a square image works best).
- 2
Choose which icon sizes to include (16–256 px).
- 3
Optionally round the corners and fill a background color.
- 4
Download your multi-size .ico file.
About the Icon Converter
Windows apps and many favicons use the ICO format, which can pack several resolutions into one file. The icon converter turns any image into a multi-size .ico with optional rounded corners and a background, so your icon looks crisp everywhere from a 16px taskbar to a 256px high-DPI display.
Frequently asked questions
What is an ICO file?
A Windows icon file that can hold several image sizes in one file — used for application icons and website favicons.
Which sizes should I include?
16, 32 and 48 px cover browser tabs and the desktop; add 256 px for high-DPI displays.
Can the icon have a transparent background?
Yes. Leave 'Fill background' off to keep transparency — the ICO uses PNG-compressed entries that support alpha.
Are my images uploaded to a server?
No. The ICO is built entirely in your browser; your image never leaves your device.