PNG to ICO Converter
Convert PNG images to ICO format for Windows icons. Choose multiple output sizes from 16×16 to 256×256. Free, private, and browser-based. Your images never leave your device.
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Supports JPG, PNG, WebP, GIF, BMP - up to 50 MB
Icon conversion tips
ICO format for Windows
ICO is the native Windows icon format. It supports multiple sizes in a single file, from 16×16 up to 256×256.
Transparency preserved
PNG images with transparent backgrounds maintain their transparency when converted to ICO format.
Multiple sizes included
Select the sizes you need: 16, 32, 48, 64, 128, or 256 pixels. Windows will automatically pick the best size.
Browser-based conversion
All conversion happens locally in your browser. Your images never leave your device.
Why convert PNG to ICO
PNG is a versatile image format that supports transparency and is widely used on the web. However, Windows desktop icons use the ICO format, which allows multiple size variants to be stored in a single file. When you set a desktop shortcut or file association icon, Windows expects an ICO file.
Our converter loads your PNG image and generates an ICO file containing PNG data at each selected size. For sizes of 256×256 or larger, the ICO format uses 0 in the size field to indicate 256 pixels. All transparency information is preserved since the ICO stores raw PNG data.
All processing happens locally in your browser. Your images are never uploaded to any server, ensuring complete privacy. Choose which sizes to include based on your needs — for most icon uses, 16×16, 32×32, 48×48, and 256×256 cover all common scenarios.
Frequently asked questions
What is ICO format?
ICO (Windows Icon) is a file format for computer icons on Windows. It can store multiple images at different sizes and color depths in a single file, allowing the system to choose the best representation for each display context.
What sizes can I include in the ICO file?
You can include any combination of 16×16, 32×32, 48×48, 64×64, 128×128, and 256×256 pixels. Windows automatically selects the appropriate size for each context (taskbar, desktop, explorer).
Does the ICO file preserve transparency?
Yes. The conversion uses PNG data inside the ICO container, which preserves alpha channel transparency from the original PNG image.
Are my images uploaded to a server?
No. All conversion happens locally in your browser using the Canvas API. Your images never leave your device.
What image formats can I convert?
You can upload any image that the browser can read: PNG, JPEG, WebP, GIF, or BMP. The conversion exports as ICO format.