What is ICO?
Windows icons containing one or more small images at different resolutions.
Technical details
ICO begins with an image directory whose entries describe embedded icon images at different sizes and color depths. [1]
Background and compatibility
Windows applications use icon-directory resources to offer resolution choices; the directory records each image's dimensions and offset. [1]
Sources and references
- ICONRESDIR structureMicrosoft Learn
Preview on your device
Visual image preview; decoding depends on the image encoding and browser.
Conversion support
Choose a file in the workspace to see the available output formats and options. A supported container may still contain an unsupported codec.
Read the format reference on Wikipedia ↗