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ICO (Windows Icon) is a multi-resolution icon container used for Windows application icons and web favicons. GIF (Graphics Interchange Format) is a widely supported web image format with 256-color palette support and binary transparency. Converting ICO to GIF produces a lightweight web image from an icon file, suitable for displaying icon previews in web contexts where GIF is the expected format.
Since ICO icons typically use limited color palettes and small dimensions, GIF's 256-color restriction is often not a limitation. Simple application icons and favicons frequently use fewer than 256 colors, making GIF a natural fit for icon image distribution.
GIF is universally supported in web browsers, email clients, forum software, and legacy CMS platforms. When you need to embed icon images in HTML emails, wiki pages, or forum posts, GIF provides guaranteed display compatibility. Unlike ICO, which only renders properly in browsers as favicons or in Windows shell, GIF displays inline in any web context.
GIF's binary transparency support is sufficient for most icon images, which typically have hard-edged (non-anti-aliased) transparency boundaries. Simple icons with flat colors and hard edges convert to GIF with no visible quality loss.
The largest resolution image from the ICO container is extracted and decoded to an RGBA pixel buffer. The full-color image is then quantized to a 256-color adaptive palette. If the ICO has alpha transparency, pixels below a threshold opacity are mapped to GIF's single transparent color index. The output follows the GIF89a specification with LZW compression. Since most icons use limited color palettes, the quantization step often preserves the exact original colors.
For icons with fewer than 256 colors (most application icons), the GIF output is visually identical to the ICO source. Icons with smooth gradients, photographic elements, or more than 256 colors will show some color quantization. GIF's binary transparency means anti-aliased edges against transparent backgrounds will show stair-stepping. Since icon images are small, these artifacts are often imperceptible at display size.
| Device | ICO | GIF |
|---|---|---|
| Windows PC | Native | Native |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Partial |
| Web Browser | No |
ICO to GIF is effective for converting icon images to a universally supported web format. Most icons fit within GIF's 256-color limit, producing visually identical output.
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| Native |
| الميزة | ICO | GIF |
|---|---|---|
| الاسم الكامل | Windows Icon | Graphics Interchange Format |
| الامتداد | .ico | .gif |
| الأفضل لـ | Windows icons | Animation support |