Online ICO Converter for Windows Icons
ICO files are used for Windows icons, folders, and legacy favicons. Turn a PNG or JPG into an ICO with several sizes in one file.
ICO is an icon format that can hold several sizes in one file. Windows uses it for application icons, shortcuts, and folders. Use the ICO converter to turn a PNG or JPG into an ICO file.
Recommended sizes
Include 16, 32, 48, and 256 pixels so the icon stays sharp at different display sizes. For modern icons, 256 pixels helps when the file is shown large in File Explorer.
- Start with a square image of at least 256 pixels.
- Keep transparency if the source format supports it.
- Avoid upscaling an image that is too small.
- Check the result in Windows before publishing.
Using it on a website
ICO files are still useful as a fallback favicon for older browsers. Keep a PNG version for other needs as well. All conversion runs in your browser, so the image is never sent to a server.
Avoid blurry icons
Do not take a 64 pixel image and enlarge it to 256 pixels. Start from a vector design or a large source image, then export each size so the lines stay sharp on high-resolution displays.
Frequently asked questions
What is the difference between ICO and PNG?
ICO can store several sizes in one file, while PNG stores a single image.
Which ICO sizes should I include?
Include 16, 32, 48, and 256 pixels for different Windows display sizes.
Is transparency preserved?
Yes, if the source image has a transparent background.
Is the file uploaded?
No. Conversion runs in the browser and the file stays on your device.