ICO file format
| Extension | .ico |
| Category | images |
| Programs | Adobe Photoshop Microsoft Paint Windows Picture and Fax Viewer |
| Description | .ico (Icon File) The .ico format is used for icon files in Microsoft Windows. ICO files contain one or more small images at multiple sizes and color depths, so they may be scaled appropriately in different contextsThese files are commonly used to display a small image next to a website's name in a browser's address bar, as well as for application icons on both Windows desktop and mobile platforms. |
| Technical details | The `.ico` format is primarily used for icons in Windows. It supports multiple resolutions, color depths, and transparency. Here are the key technical details: - Multiple Resolutions and Color Depths: Contains images at various sizes and color depths. - Color Support: Supports 24-bit RGB and 32-bit ARGB with alpha transparency. - Transparency: Allows for transparent backgrounds. - File Structure: Begins with an icon directory specifying image details. - Compression: Can use PNG for smaller file sizes with lossless compression. - Compatibility: Widely supported in Windows and some graphic software. - Use in Web Browsers: Common for web favicons (16x16 or 32x32 pixels). - File Size: Varies based on included images and compression. - Backward Compatibility: Works with older Windows versions. - Limited Use Outside Windows: Mainly used for Windows icons and web favicons. `.ico` excels in representing icons in Windows and as favicons in web browsers. |
| MIME type | image/ico image/x-icon application/ico application/x-ico application/x-win-bitmap image/x-win-bitmap application/octet-stream |