ICO

ICO Icon File

An ICO file is an image format used to store icons for Microsoft Windows. It can contain multiple images of different sizes and color depths, including transparency.

What is ICO Icon File?

The ICO file format is a standard image file format for computer icons on Microsoft Windows. Developed by Microsoft, it stores one or more small bitmap images at various sizes and color depths, allowing the operating system to scale icons appropriately for different display settings. ICO files support transparency via an alpha channel, making them suitable for application icons, shortcuts, and website favicons.

Advantages

Supports multiple image sizes and color depths in one file.
Includes alpha channel for transparency.
Native format for Windows icons.
Compact for small images.

Limitations

Primarily Windows-centric.
Not ideal for large, complex images.
Limited color depth options in older versions.

How to open ICO Icon File files

Microsoft Windows (natively displays them) Adobe Photoshop GIMP Paint.NET IrfanView XnView MP

Common use cases

Customizing desktop shortcuts and folders.
Creating application icons for Windows software.
Designing favicons for websites (e.g., favicon.ico).
Representing file types in Windows Explorer.

ICO converters

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Frequently asked questions

An ICO file is a Microsoft Windows icon image format that can store multiple small images of different sizes and color depths, typically used for application icons, shortcuts, and website favicons.

Yes, ICO files support an alpha channel, allowing for transparent backgrounds in icons.

You can create ICO files using image editing software like Photoshop or GIMP, or by converting other image formats (like PNG, JPG) to ICO using tools like ConvertX.

ICO files contain multiple image sizes (e.g., 16x16, 32x32, 48x48, 256x256 pixels) to adapt to different display needs.

favicon.ico is a standard filename for a website's icon, displayed in browser tabs and bookmarks, and the .ico format is widely supported across browsers for this purpose.